Liquid fabric softener with insoluble particles stably suspended by soil release polymer

WO 93/05138 ~ ~ ~ ~ ~ ~ ~ PCT/US92/07015 LIQUID FABRIC SOFTENER WITH INSOLUBLE PARTICLES STABLY SUSPENDED BY SOIL RELEASE POLYMER TECHNICAL FIELD This invention relates to compositions and methods for softening fabrics during the rinse cycle of home laundering operations.

This is a widely used practice to impart to laundered fabrics a texture, or hand, that is smooth, pliable and fluffy to the touch (i.e., soft).

The invention also relates to the protection of water sensitive materials.

BACKGROUND ART Fabric softening compositions, and especially liquid fabric softening compositions, have long been known in the art and are widely utilized by consumers during the rinse cycles of automatic laundry operations.

The term "fabric softening" as used herein and as known in the art refers to a process whereby a desirably soft hand and fluffy appearance are imparted to fabrics.

Rinse-added fabric softening compositions normally contain perfumes to impart a pleasant odor to the treated fabrics.

It is desirable to have improved perfume retention for extended odor benefits.

Perfume delivery via the liquid rinse added fabric conditioning compositions of the invention in automatic laundry washers is desirable in two ways.

Product malodors can be covered by the addition of even low levels of free perfume to the softener composition, and free perfume can be transferred onto fabrics with the softener actives in the rinse cycle.

Present technologies add free perfume directly into the softener compositions independent of the other softener components, or in microcapsules formed, e.g., by coacervation techniques.

Such encapsulated perfume can deposit on fabric in the rinse and be retained after the drying process for relatively long periods of time.

However, such microcapsules that survive the laundry processing are often ....- - 2 difficult to rupture, and free perfume that is released after the capsules rupture does not provide a noticeable rewet odor benefit.

Addition of free perfume into the softener composition allows the perfume to freely mi grate creati ng an unstabl a condi ti on and free perfume deposited on fabric dissipates fairly quickly in the drying cycle and when the fabrics are stored.

If one wishes to have the perfume on fabric to last longer in storage or during wearing, it usually requires deposition of more perfume onto fabric in the laundry process.

Higher deposition typically requires starting with an undesirably high level of perfume in the product and the resulting initial fabric odor is usually too strong.

There have been many previous attempts to protect perfume to prevent excessive odor in fabric care products and on the fabrics themselves immediately after the washing cycle is completed, while having a delayed release of perfume from the fabrics when they are being used.

Compositions containing cationic nitrogenous compounds in the form of quaternary ammonium salts and/or substituted imidazolinium salts having two long chain acyclic aliphatic hydrocarbon groups are commonly used to provide fabric softening benefits when used in laundry rinse operations (See, for example, U.S.

Pat.

Nos.:

3,644,203, Lamberti et al., issued Feb. 22, 1972: and 4,426,299.

Verbruggen, issued Jan. 17, 1984; also "Cationic Surface Active Agents as Fabric Softeners," R. R.

Egan, Journal of the American Oil Chemists' Society, January 1978, pages 118-121; and "How to Choose Cationics for Fabric Softeners," J. A.

Ackerman, Journal of the American Oil Chemists' Society, June 1983, pages 1166-1169).

Quaternary ammonium salts having only one long chain acyclic aliphatic hydrocarbon group (such as monostearyltrimethyl ammonium chloride) are less commonly used because for the same chain length, compounds with two long alkyl chains were found to provide better softening performance than those having one long alkyl chain. (See, for example, "Cationic Fabric Softeners," W. P.

Evans, Industry and Chemistry, July 1969, pages 893-903). U.S.

Patent No. 4,464,272, Parslow et al., issued Aug. 7. 1984, also teaches that monoalkyl quaternary ammonium compounds are less effective softeners.

Another class of nitrogenous materials that are sometimes used in fabric softening compositions are the nonquaternary amide-amines.

~.- - 3 A commonly ci ted materi al i s the reacti on product of hi gher fatty acids with hydroxyalkylalkylenediamines.

An example of these materials is the reaction product of higher fatty acids and hydroxyethylethylenediamine (See "Condensation Products from BHydroxyethylethylenediamine and Fatty Acids or Their Alkyl Esters and Their Application as Textile Softeners in Washing Agents," H.W.

Eckert, Fette-Seifen-Anstrichmittel, September 1972, pages 527-533).

These materials are usually cited generically along with other cationic quaternary ammonium salts and imidazolinium salts as softening actives in fabric softening compositions. (See U.S. patent Nos. 4,460,485, Rapisarda et al., issued July 17, 1984; 4.421,792, Rudy et al., issued December 20, 1983; 4,327.133, Rudy et al., issued April 27. 1982. U.S.

Pat.

No. 3.775,316, Berg et al, issued November 27, 1973, discloses a softening finishing composition for washed laundry containing (a) the condensation product of hydroxyalkylalkylpolyamine and fatty acids and (b) a quaternary ammonium compound mixture of (i) from 0~ to 100 of quaternary ammonium salts having two long chain alkyl groups and (ii) from 100 to 0~ of a germicidal quaternary ammonium compound of the formula [R5R6R'R$N]+ A- wherei n RS i s a 1 ong chaff n al kyl group, R6 i s a member selected from the group consisting of arylalkyl group and C3-Cl$ alkenyl and alkadienyl containing one or two C = C double bonds, R' and R8 are Cl-C, alkyl groups, and A is an anion. U.S.

Patent No.

3,904.533.

Neiditch et al., issued September 9. 1975, teaches a fabric conditioning formulation containing a fabric softening compound and a low temperature stabilizing agent which is a quaternary ammonium salt containing one to three short chain Clo-C14 alkyl groups; the fabric softening compound is selected from a group consisting of quaternary ammonium salts containing two or more long chain alkyl groups, the reaction product of fatty acids and hydroxyalkyl CA 02115540 1999-O1-08 -4alkylene diamine, and other cationic materials.

SUMMARY OF THE INVENTION The present invention relates primarily to fabric softening compositions, preferably in liquid form, for use in the rinse cycle of home laundry operations.

The present invention is based, at least in part, on: (a) the discovery that certain particulate water sensitive materials such as particulate complexes of cyclodextrins and perfumes. as described more fully hereinafter. can be protected, even for extended periods, in hostile environments such as liquid fabric softening compositions, laundry wash solutions, laundry rinse water, etc., by relatively high melting, water-insoluble (and preferably non-water-swellable), protective material that is solid at normal storage conditions, but which melts at the temperatures encountered in automatic fabric dryers (laundry dryers), said water sensitive materials. e.g., particulate complexes typically being imbedded in said protective material which is in particulate form (e.g., protected particulate cyclodextrin complexes); (b) the discovery that soil release polymers, and especially polyester soil rel ease pol ymers as descri bed i n detai 1 herei nafter . can hel p suspend water-insoluble particles, including the protected particulate cyclodextrin complexes of (a), in aqueous fabric softening compositions; and/or (c) the discovery of a process in which said protective materials are melted and dispersed in water with particulate water sensitive material. and cooled to form small, smooth, spherical protected particles containing the water sensitive material which is at least partially enrobed by said protective material.

Said protective material, described in detail hereinafter.

is relatively insoluble in aqueous liquids, especially fabric softener compositions and is preferably not swollen by said aqueous liquids (non-water-swellable).

Preferably, the protected particles of (a) are suspended by the soil release polymer of (b).

The protected particles of (a) become attached to fabrics in the rinse cycle and the protective materials soften in an automatic laundry dryer cycle to free the cyclodextrin/perfume complex in the dryer, and attach said complex to the fabric during the drying step.

The perfume is retained in the complex until sub ,~.. _ 5 _ ~ ~' ~' sequent rewetting releases the perfume.

Thus, this invention expands the benefits of the invention described in U.S.

Patent No. 5.102,564 for Treatment of Fabrics with Perfume/Cyclodextrin Complexes.

More specifically, fabric softening compositions are provided in the form of aqueous dispersions comprising from about 3~ to about 35% by weight of fabric softener, and from about 0.5~ to about 25~.

preferably from about l~ to about 15~ of protected particles comprising particulate cyclodextrin/perfume complex which is protected by an effective amount of protective material that is substantially water-insoluble and non-water-swellable, and has a melting point of from about 30°C to about 90°C, preterably from about 35°C to about 80°C, the protected complex particles being stably dispersed in said aqueous composition by an effective amount of soil release polymer.

The pH (10~ solution) of such compositions is typically less than about 7, and more typically from about 2 to about 6.5.

DETAILED DESCRIPTION OF THE INVENTION The amount of fabric softening agent in the compositions of this invention is typically from about 3~ to about 35~, preferably from about 4~ to about 27~, by weight of the composition.

The lower limits are amounts needed to contribute effective fabric softening performance when added to laundry rinse baths in the manner which is customary in home laundry practice.

The higher limits are suitable for concentrated products which provide the consumer with more economi cal usage due to a reducti on of packagi ng and di stri buti ng costs.

Some preferred compositions are disclosed in U.S.

Patent No.

4.661,269, issued April 28, 1987, in the names of Toan Trinh> Errol H.

Wahl, Donald M.

Swartley and Ronald L.

Hemingway.

The Liquid Composition Liquid, preferably aqueous, fabric softening compositions typically comprise the following components:

I. from about 3% to about 35~, preferably from about 4~ to about 27~, by weight of the total composition of fabric CA 02115540 1999-O1-08 -6softener; II. from about 0.5% to about 25%, preferably from about 1% to about 15%, more preferably from about 1% to about 5%, of protected particulate cyclodextrin/perfume complex, said complex being effectively protected by solid, substantially water-insoluble and substantially non-water swellable protective material that melts at a temperature between about 30C and about 90C, the said protective material being from about 50% to about 1000%, preferably from about 100% to about 500%, more preferably from about 150% to about 300% , by wei ght of sai d cycl odextri n/perfume complex;

III. from 0.05% to about 5% of polymeric soil release agent, in an effective amount to stably suspend the protected particulate cyclodextrin/perfume complex II the composition; and IV. the balance comprising liquid carrier selected from the group consi sti ng of water , C1-C4 monohydri c a 1 cohol s , C2-C6 polyhydric alcohols, liquid polyalkylene glycols and mixtures thereof.

One suitable fabric softener (Component I) is a mixture comprising:

( a ) from about 10% to about 80% of the reacti on product of higher fatty acids with a polyamine selected from the group consisting of hydroxyalkylalkylenediamines and dialkylenetriamines and mixtures thereof:

(b) from about 3% to about 40% of cationic nitrogenous salts contai ni ng only one 1 ong chaff n acycl i c al i phati c C15-Czz hydrocarbon group; and optionally, (c) from 10% to about 80% of cationic nitrogenous salts having two or more 1 ong chaff n acycl i c al i phati c C15-C22 hydrocarbon groups or one said group and an arylalkyl group;

said (a), (b) and (c) percentages being by weight of Component I. -r -7 Following are the general descriptions of the essentials and optionals of the present compositions including specific examples.

The examples are provided herein for purposes of illustration only.

DESCRIPTION OF THE INVENTION 1. CYCLODEXTRINS As used herein, the term "cyclodextrin" (CD) includes any of the known cyclodextrins such as unsubstituted cyclodextrins containing from six to twelve glucose units. especially, alpha-, beta-, gammacyclodextrins, and mixtures thereof, and/or their derivatives, including branched cyclodextrins, and/or mixtures thereof, that are capable of forming inclusion complexes with perfume ingredients.

Alpha-, beta-, and gamma-cyclodextrins can be obtained from, among others, American Maize-Products Company (Amaizo), Corn Processing Division, Hammon, Indiana: and Roquette Corporation, Gurnee, Illinois.

There are many derivatives of cyclodextrins that are known.

Representative derivatives are those disclosed in U.S.

Patent Nos.: 3.426,011, Parmerter et al., issued Feb. 4, 1969: 3,453,257, 3,453,258, 3,453,259, and 3,453,260, all in the names of Parmerter et al., and all issued July 1, 1969: 3,459,731, Gramera et al., issued Aug. 5, 1969; 3,553,191, Parmerter et al., issued Jan. 5, 1971: 3.565.887, Parmerter et al., issued Feb. 23, 1971: 4,535.152, Szejtli et al, issued Aug. 13, 1985: 4,616,008, Hirai et al, issued Oct. 7, 1986: 4,638,058, Brandt et al, issued Jan. 20, 1987;

4,746,734, Tsuchiyama et al, issued May 24, 1988: and 4,678,598, Ogino et al, issued Jul. 7, 1987.

Examples of cyclodextrin deri vati ves sui tabl a for use herei n are methyl -B-CD, hydroxyethyl -f3 CD. and hydroxypropyl-f3-CD of different degrees of substitution (D.S.), available from Amaizo and from Aldrich Chemical Company, Milwaukee, Wisconsin.

The individual cyclodextrins can also be linked together, e.g., using multifunctional agents to form oligomers, cooligomers, polymers, copolymers, etc.

Examples of such materials are available commercially from Azmaizo and from Aldrich Chemical Company (f3 CD/epichlorohydrin copolymers).

_g_ It i s al so desi rabl a to use mi xtures of cycl odextri ns and/or precursor compounds to provide a mixture of complexes.

Such mixtures, e.g., can provide more even odor profiles by encapsulating a wider range of perfume ingredients and/or preventing formation of large crystals of said complexes.

Mixtures of cyclodextrins can conveniently be obtained by using intermediate products from known processes for the preparation of cyclodextrins including those processes described in U.S.

Pat.

Nos.: 3,425,910, Armbruster et al., issued Feb. 4, 1969; 3,812,011, Okada et al., issued May 21, 1974y 4,317,881, Yagi et al, issued Mar. 2, 1982; 4,418,144, Okada et al, issued Nov. 29, 1983; and 4,738,923, Ammeraal, issued Apr. 19, 1988.

Preferably at least a major portion of the cyclodextrins are alphacyclodextrin, beta-cyclodextrin, and/or gamma-cyclodextrin, more preferably beta-cyclodextrin.

Some cyclodextrin mixtures are commercially available from, e.g., Ensuiko Sugar Refining Company, Yokohama, Japan.

2. PERFUMES Fabric softening products typically contain some perfume to provide some fragrance to provide an olfactory aesthetic benefit and/or to serve as a signal that the product is effective.

However, the perfume in such products is often lost before it is needed.

Perfumes can be subject to damage and/or loss by the action of, e.g., oxygen, light, heat, etc.

For example, due to the large amount of water used in the rinse cycle of a typical automatic washing machine and/or the hi gh energy i nput and 1 arge ai r fl ow i n the dryi ng process used in the typical automatic laundry dryers, a large part of the perfume provided by fabric softener products has been lost.

The loss occurs when the perfume is either washed out with the rinse water and/or lost out the dryer vent.

Even for less volatile components, as described hereinafter, only a small fraction remains on the fabrics after the washing and drying cycles are completed.

The loss of the highly volatile fraction of the perfume, as described hereinafter, is much higher.

Usually the loss of the highly volatile fraction is practically total.

Due to this effect, many perfumes used in, e.g., dryer-added fabric softener compositions, have been composed mainly of less volatile, high boiling (having high boiling points), perfume components to maximize survival of the odor ~,.° - 9 character during storage and use and thus provide better "fabric substantivity." The main function of a small fraction of the highly volatile, low boiling (having low boiling points), perfume components in these perfumes is to improve the fragrance odor of the product itself, rather than impacting on the subsequent fabric odor.

However, some of the volatile, low boiling perfume ingredients can provi de a fresh and cl can i mpressi on to the substrate , and i t i s highly desirable that these ingredients be deposited and present on the fabric.

The perfume ingredients and compositions of this invention are the conventional ones known in the art.

Selection of any perfume component, or amount of perfume, is based solely on aesthetic considerations.

Suitable perfume compounds and compositions can be found in the art including U.S.

Pat.

Nos.: 4,145,184, Brain and Cummins, issued Mar. 20> 1979; 4,209.417, Whyte, issued June 24, 1980; 4.515,705, Moeddel, issued May 7, 1985> and 4,152,272, Young, issued May 1, 1979.

Many of the art recognized perfume compositions are relatively substantive, as described hereinafter, to maximize their odor effect on fabrics.

However, it is a special advantage of perfume delivery via the perfume/cyclodextrin complexes that nonsubstantive perfumes are also effective.

A substantive perfume is one that contains a sufficient percentage of substantive perfume materials so that when the perfume is used at normal levels in products, it deposits a desired odor on the treated fabric.

In general, the degree of substantivity of a perfume is roughly proportional to the percentage of substantive perfume material used.

Relatively substantive perfumes contain at least about l~, preferably at least about 10~, substantive perfume materials.

Substantive perfume materials are those odorous compounds that deposit on fabrics via the treatment process and are detectable by people with normal olfactory acuity.

Such materials typically have vapor pressures lower than that of the average perfume material.

Also, they typically have molecular weights of about 200 or above, and are detectable at levels below those of the average perfume material.

B r "r. - 3. COMPLEX FORMATION The complexes of this invention are formed in any of the ways known in the art.

Typically, the complexes are formed either by bringing the perfume and the cyclodextrin together as solutions in suitable solvents, preferably water> or in suspension or by kneading the ingredients together in the presence of a suitable, preferably minimal, amount of solvent, preferably water.

Other polar solvents such as ethanol, methanol, isopropanol, etc., and mixtures of said polar solvents with themselves and/or with water can be used as solvents for complex formation.

The use of such solvents in complex formation has been disclosed in an article in Chemistry Letters by A.

Harada and S.

Takahashi, pp. 2089-2090 (1984).

The suspension/kneading method is particularly desirable because less solvent is needed and therefore less separation of the solvent is required.

Additional disclosures of complex formation can be found in Atwood, J.L., J.E.D.

Davies & D.D.

MacNichol, (Ed.): Inclusion Compounds, Uol. III, Academic Press (1984), especially Chapter 11;

Atwood, J.L. and J.E.D.

Davies (Ed.): Proceedings of the Second International Symposium of Cyclodextrins, Tokyo, Japan (July, 1984);

Cvclodextrin Technology, J.

Szejtli, Kluwer Academic Publishers (1988).

In general , perfume/cycl odextri n compl exes have a mol ar rati o of perfume to cyclodextrin of 1:1.

However, the molar ratio can be either higher or lower, depending on the molecular size of the perfume and the identity of the cyclodextrin compound.

The molar ratio can be determined by forming a saturated solution of the cyclodextrin and adding the perfume to form the complex.

In general the complex will precipitate readily.

If not, the complex can usually be precipitated by the addition of electrolyte, change of pH, cooling, etc.

The complex can then be analyzed to determine the ratio of perfume to cyclodextrin.

f~~ v~~g - 11 As stated hereinbefore, the actual complexes are determined by the size of the cavity in the cyclodextrin and the size of the perfume molecule.

Although the normal complex is one molecule of perfume in one molecule of cyclodextrin> complexes can be formed between one molecule of perfume and two molecules of cyclodextrin when the perfume molecule is large and contains two portions that can fit in the cyclodextrin.

Highly desirable complexes can be formed using mixtures of cyclodextrins since some perfumes are mixtures of compounds that vary widely in size.

It is usually desirable that at least a majority of the cyclodextrin be alpha-, beta-, and/or gammacyclodextrin, more preferably beta-cyclodextrin.

Processes for the production of cyclodextrins and complexes are described in U.S.

Pat.

Nos.: 3,812,011, Okada, Tsuyama, and Tsuyama, issued May 21, 1974; 4,317,881, Yagi, Kouno and Inui, issued March 2, 1982; 4,418,144, Okada, Matsuzawa, Uezima, Nakakuki, and Horikoshi , issued Nov. 29. 1983; 4,378,923, Ammeraal , issued Apr. 19, 1988.

Materials obtained by any of these variations are acceptable for the purposes of this invention.

It is also acceptable to initially isolate the inclusion complexes directly from the reaction mixture by crystallization.

Continuous operation usually involves the use of supersaturated solutions, and/or suspension/kneading, and/or temperature manipulation, e.g., heating and then cooling and drying.

In general, the fewest possible process steps are used to avoid loss of perfume and excessive processing costs.

4. COMPLEX PARTICLE SIZES The particle sizes of the complexes are selected according to the desired perfume release profile.

Small particles, e.g., from about 0.01 ~m to about 15 Vim, preferably from about 0.01 ~m to about 8 um, more preferably from about 0.05 ~m to about 5 Vim, are desirable for providing a quick release of the perfume when the dried fabrics are rewetted.

It is a special benefit of this invention that small particles can be maintained by, e.g., incorporation of the cyclodextrin in the encapsulating material to make the larger agglomerates that are desired for attachment to the CA 02115540 1999-O1-08 - 12 fabric.

These small particles are conveniently prepared initially by the suspension/kneading method.

Larger particles, e.g., those having particle sizes of from about 15 arm to about 500 ~m preferably from about 15 ~m to about 250 Vim, more preferably from about 15 Nm 5 to about 50 Vim, are unique in that they can provide either slow release of perfume when the substrates are rewetted with a large amount of water or a series of releases when the substrates are rewetted a plurality of times.

The larger particle size complexes are conveniently prepared by a crystallization method in which the 10 complexes are allowed to grow, and large particles are ground to the desired sizes if necessary.

Mixtures of small and large particles can give a broader active profile.

Therefore, it can be desirable to have substantial amounts of particles both below and above 15 microns.

15 5. THE PROTECTIVE MATERIAL The protective material is selected to be relatively unaffected by aqueous media and to melt at temperatures found in the typical automatic laundry dryer.

Surprisingly, the protective material survives storage, e.g.. in liquid fabric softener compositions:

20 protects the water sensitive material, e.g., the cyclodextrin/perfume complex particles, so that they attach to fabrics; and then releases the water sensitive material, e.g., the complex in the dryer so that the complex can release perfume when the fabric is subsequently rewetted.

The water sensitive material, e.g., particulate 25 cyclodextrin/perfume complex is typically imbedded in the protective material so that it is effectively "enrobed" or "surrounded" and the protective material effectively prevents water and/or other materials from destroying the complex and/or displacing the perfume.

Other water sensitive materials can also be protected by the protective 30 material.

It is surprising that the complex can be so effectively protected duri ng storage and i n such hosti 1 a envi ronments as a 1 i qui d fabric softener composition, a laundry solution, and/or water in a laundry rinse cycle and still be readily released in the drying 35 cycle.

The protective material is preferably almost totally water-insoluble and, at most, only slightly swellable in water (nonwater-swellable) to maximize protection. E.g., the solubility in CA 02115540 1999-O1-08 - 13 water at room temperature is typically less than about 250 ppm.

preferably less than about 100 ppm, more preferably less than about 25 ppm.

Depending upon the solubility, chemical properties, and/or structures of any protective material (or composition). the 5 solubility can readily be determined by known analytical methods, e.g.. gravimetric, osmometric, spectrometric, and/or spectroscopic methods.

The melting point (MP), or range, of the protective material is between about 30°C and about 90°C, preferably between about 35°C and about 80°C, more preferably between about 40°C and 10 about 75°C.

The melting point can be either sharp or the melting can occur gradually over a temperature range.

It can be desirable to have a melting range, since the presence of some molten material early in the drying cycle helps to attach the particles to the fabric, thereby minimizing the loss of particles through_the air 15 outlet holes and the presence of higher melting materials helps protect the cycl odextri n/perfume compl ex duri ng the early part of the drying cycle when there is still a substantial amount of moisture present.

Suitable protective materials are petroleum waxes, natural 20 waxes, fatty materials such as fatty alcohol/fatty acid esters, polymerized hydrocarbons, etc.

Suitable examples include the following: Vybar 260 (MP about 51°C) and Vybar 103 (MP about 72°C).

polymerized hydrocarbons sold by Petrolite Corporation: myristyl (MP about 38-40°C), cetyl (MP about 51°C), and/or stearyl (MP about 25 59-60°C) alcohols: hydrogenated tallow acid ester of hydrogenated tallow alcohol (MP about 55°C): cetyl palmitate (MP about 50°C):

hydrogenated castor oil (MP about 87°C): partially hydrogenated castor oil (MP about 70°C): methyl 12-hydroxystearate .(MP about 52°C): ethylene glycol 12-hydroxystearate ester (MP about 66°C):

30 propylene glycol 12-hydroxy ester (MP about 53°C); glycerol 12hydroxystearate monoester (MP about 69°C): N-(betahydroxyethyl)ricinoleamide (MP about 46°C): calcium ricinoleate (MP about 85°C): alkylated polyvinyl pyrollidone (PVP) derivatives such as Ganex polymers V220 (MP about 35-40°C) and WP-660 (MP about 35 58-68°C): silicone waxes such as stearyl methicones SF1134 from General Electric Co. (MP about 36°C), and Abil Wax 9809 from Goldschmidt (MP about 38°C): and mixtures thereof.

Other suitable WO 93/05138 PCT/US92/07015 ~~ ~°~ ~~ ~ ~~ _ 14 _ ' ~ protective materials are disclosed in U.S.

Pat.

Nos.. 4,152.272.

'Young, issued May 1, 1979 and 4,954,285.

Wierenga et al., issued Sept. 4. 1990.

The protected particles described herein can also be used in solid, especially particulate, products.

When the particles are stored in dry products and only exposed to aqueous media for short times, protective materials that are slowly water-swellable can be used to protect water sensitive materials for the short time they are exposed to the aqueous media.

l0 The protected particulate complexes of cyclodextrin and perfume can be prepared by a variety of methods.

The complex can surprisingly be mixed with the molten protective material without destroying the complex structure, cooled to form a solid, and the particle size reduced by a method that does not melt the said protective material, e.g., cryogenic grinding; extrusion of fine "cylindrical" shapes followed by chopping; and/or mixtures thereof.

Such methods tend to form desirable irregular particles that are easily entrapped in the fabrics during the rinse cycle of a typical home laundry operation using an automatic washer and/or when the rinse water is filtered through the fabrics at the end of the rinse cycle.

The complexes can also be protected by spraying the molten protective material onto a fluidized bed of the complex particles or by spray cooling the molten protective material with the complex suspended in it.

The process that is selected can be any of those known to the prior art, so long as the process results in substantially complete coverage of the complex particles.

A preferred process of forming protected particles using protective materials such as those herein, involves: (a) preparing 3o a melt of the said material; (b) admixing the particle; (c) dispersing the molten mixture with high shear mixing into either an aqueous surfactant solution or an aqueous fabric softener composition; and then (d) cooling the resulting dispersion to solidify the protective material.

If the protected particles are formed in an aqueous surfactant solution, they can be added as a preformed dispersion to the fabric softener composition.

They can - 15 also be dried and added in particulate form to particulate fabric softener compositions, detergent compositions, etc.

In addition to the perfume/cyclodextrin complex particles, this preferred process can be used to protect other particles, including perfume particles made by coacervation techniques, e.g., as disclosed in U.S.

Pat.

4,946,624, Michael, issued Aug. 7, 1990.

Other, e.g., water sensitive and relatively water-insoluble particles or relatively water-insoluble particles that are incompatible with, e.g., fabric softener compositions can be protected by the same process.

For example, bleach materials, bleach activators, etc., can be protected by this process.

When these particles are formed in an aqueous surfactant solution, it should contain at least about the critical micelle concentration of said surfactant.

The particles resulting from dispersing the particles in the surfactant solution are especially desirable when they are dried and used in either granular detergent compositions or powdered fabric softener compositions.

The complex imbedded in protective material can be added as large particles into aqueous fabric softener composition and the resulting slurry subjected to high shear mixing to reduce the particle size of the complex particles.

This process is desirable, since the energy required to break up dry particles will tend to melt the encapsulating material and reagglomerate the particles unless the heat is removed and/or absorbed, e.g, by use of liquid nitrogen or solid carbon dioxide.

Typically, the amount of protective material is from about 50~ to about 1000%, preferably from about. 100% to about 500%, more preferably from about 150% to about 300, of the cyclodextrin/perfume complex.

In general, the least amount of the protective material that is used, the better.

Hydrocarbon materials usually provide the best protection against an aqueous environment.

The encapsulated particles preferably range in diameter between about 1 and about 1000 microns, preferably between about 5 and about 500 microns, more preferably between about 5 and about 250 microns.

Although some of the particles can be outside these ranges, most, e.g., more than about 90~ by weight, of the particles should have diameters within the ranges.

There is a balance between protection ~'s, °~;, ..

-- - 16 of the complex and the ability of the particles to be retained on the fabric.

The larger particles protect the complex better during storage in the liquid fabric softener compositions and in the rinse water and can be retained on the fabric as a result of the filtration mechanism when the fabrics are "spun dry" at the end of the typical rinse cycle.

However, small particles can be entrapped in the weave of the fabric during the rinse cycle and therefore tend to be more efficiently attached to the fabric.

Thus, during the early part of the dryi ng cycl a , before the encapsul ati ng materi al has softened , the larger particles are more easily dislodged by the tumbling action of the dryer.

The smaller particles, i.e., those having diameters of less than about 250 microns are therefore more efficient overall in providing the desired end benefit.

The protected particles can also be used by admixing them with granular detergent compositions, e.g., those described in U.S.

Pat.

Nos.: 3,936,537, Baskerville, issued Feb. 3, 1976; 3,985,669, Krummel et al, issued Oct. 12, 1976; 4,132,680, Nicol, issued Jan. 2, 1979.

6. THE FABRIC SOFTENERS Fabric softeners that can be used herein are disclosed in U.S.

Pat.

Nos. 3,861,870, Edwards and Diehl; 4,308,151, Cambre; 3,886,075, Bernardino; 4,233,164, Davis; 4,401,578.

Verbruggen; 3,974,076, Wiersema and Rieke; and 4,237,016, Rudkin, Clint, and Young.

A Preferred fabric softener of the invention comprises the following:

Coma~onent I ( a ) A preferred softening agent (active) of the present invention is the reaction products of higher fatty acids with a polyamine selected from the group consisting of hydroxyalkylalkylenediamines and dialkylenetriamines and mixtures thereof.

These reaction products are mi xtures of several compounds i n vi ew of the mul ti -functi onal structure of the polyamines (see, for example, the publication by H.

W.

Eckert in Fette-Seifen-Anstrichmittel, cited CA 02115540 1999-O1-08 - 17 above).

The preferred Component I(a) is a nitrogenous compound selected from the group consisting of the reaction product mixtures or some selected components of the mixtures.

More specifically, the 5 preferred Component I(a) is compounds selected from the group consisting of:

(i) the reaction product of higher fatty acids with hydroxyalkylalkylenediamines in a molecular ratio of about 2:1, said reaction product containing a composition having a compound of the formula:

H\ /RZOH O N-R3-N O R~- C C -R~ wherei n Rl i s an acycl i c al i phati c C15-Cn hydrocarbon group and R2 and R3 are di val ent C,-C3 al kyl ene groups ;

(ii) substituted imidazoline compounds having the formula:

N-CH2 R~-C N-CH2 HO- R2 wherein Ri and RZ are defined as above;

(iii) substituted imidazoline compounds having the formula:

N-CH2 R~-C O N-CH2 R,- C-O- R wherein R1 and RZ are defined as above;

(iv) the reaction product of higher fatty acids with dialkylenetriamines in a molecular ratio of about 2:1, CA 02115540 1999-O1-08 - 18 said reaction product containing a composition having a compound of the formula:

0 0 Rl - ~ - NH - R2 - NH - R3 - NH - ~ - Rl wherein Rl. R2 and R3 are defined as above; and (v) substituted imidazoline compounds having the formula:

N-CH2 R~-C O N-CH2 R~- C- NH- R2 wherein R1 and Rz are defined as above;

and mixtures thereof.

10 Component I(a)(i) is commercially available as Mazamide° 6, sold by Mazer Chemicals, or Ceranine° HC, sold by Sandoz Colors &

Chemicals; here the higher fatty acids are hydrogenated tallow fatty acids and the hydroxyalkylalkylenediamine is N-2-hydroxyethylethyl enedi ami ne , and R1 i s an al i phati c C15-C1, hydrocarbon group , and R2 and R3 are divalent ethylene groups.

An example of Component I(a)(ii) is stearic hydroxyethyl imidazoline wherein R1 is an aliphatic C1, hydrocarbon group. R2 is a divalent ethylene group; this chemical is sold under the trade names of Alkazine~ ST by Alkaril Chemicals.

Inc., or Schercozoline° S by 20 Scher Chemicals.

Inc.

An example of Component I(a)(iv) is N.N"-W tan owa~KOymiethyl enetri ami ne where R1 i s an al i phati c C15-C1, hydrocarbon group and R2 and R3 are divalent ethylene groups.

An example of Component I(a>(v) is 1-tallowamidoethyl-2tallowimidazoline wherein R1 is an aliphatic C,5-C1, hydrocarbon WO 93/05138 211 ~ ~] ~ ~ PCT/US92/07015 - 19 '~' group and R2 is a divalent ethylene group.

The Components I(a)(iii) and I(a)(v) can also be first dispersed in a Bronstedt acid dispersing aid having a pKa value of not greater than about 4; provided that the pH of the final composition is not greater than about 5.

Some preferred dispersing aids are hydrochloric acid, phosphoric acid, or methylsulfonic acid.

Both N,N"-ditallowalkoyldiethylenetriamine and 1-tallowethylamido-2-tallowimidazoline are reaction products of tallow fatty acids and diethylenetriamine, and are precursors of the cationic fabric softening agent methyl-1-tallowamidoethyl-2-tallowimidazolinium methylsulfate (see "Cationic Surface Active Agents as Fabric Softeners," R. R.

Egan, Journal of the American Oil Chemicals' Society, January 1978, pages 118-121). N,N"-ditallow5 alkoyldiethyienetriamine and 1-tallowamidoethyl-2-tallowimidazoline can be obtained from Sherex Chemical Company as experimental chemicals.

Methyl-1-tallowamidoethyl-2-tallowimidazolinium methylsulfate is sold by Sherex Chemical Company under the trade name llarisofte 475.

Component Itbl The preferred Component I(b) is a cationic nitrogenous salt containing one long chain acyclic aliphatic C15-C22 hydrocarbon group selected from the group consisting of:

(i) acyclic quaternary ammonium salts having the formula:

R5 D R4 N R5 AA - - R6 wherein R4 is an acyclic aliphatic C15-C22 hydrocarbon group, R5 and R6 are C1-C4 saturated al kyl or hydroxyalkyl groups, and AB is an anion;

WO 93/05138 PCT/US92/07015 2~~'..7~~~ - zo (ii) substituted imidazoiinium salts having the formula:

N - CH2 ~;

R1 - C ~ ~ ~ A8 ~ N - CH2 i ~ , i R~ H J wherein R1 is an acyclic aliphatic C15-C21 hydrocarbon group, R7 is a hydrogen or a C1-C4 saturated alkyl or hydroxyalkyl group, and A8 is an anion;

(iii) substituted imidazolinium salts having the formula:

N - CH2 8 :5 R1 - C ~ A ~ N - CH2 HO - R2 R5 ZO wherein R2 is a divalent C1-C3 alkylene group and Rl, R5 and Ae are as defined above;

(iv) alkylpyridinium salts having the formula:

D R4 _ N / ~ AA wherein R4 is an acyclic aliphatic C16-C22 hydrocarbon group and Ae is an anion; and (v) alkanamide alkylene pyridinium salts having the formula:

D 0 I i Rl - C - NH - R2 - N~~ AA CA 02115540 1999-O1-08 - 21 wherein R~ is an acyclic aliphatic C15-Czl hydrocarbon group. R2 is a divalent C1-C3 alkylene group, and A° is an ion group;

and mixtures thereof.

Examples of Component I(b)(i) are the monoalkyltrimethylammonium 5 salts such as monotallowtrimethylammonium chloride, mono(hydrogenated tallow)trimethylammonium chloride,palmityltrimethylammonium chloride and soyatrimethylammonium chloride, sold by Sherex Chemical Company under the trade names Adogen~ 471, Adogen 441, Adogen 444, and Adogen 415, respectively.

In these salts. R4 is an acyclic aliphatic C16-Cla 10 hydrocarbon group. and R5 and R6 are methyl groups.

Mono(hydrogenated tallow)trimethylammonium chloride and monotallowtrimethylammonium chloride are preferred.

Other examples of Component I(b)(i) are behenyltrimethylammonium chloride wherein R4 is a C22 hydrocarbon group and sold under the trade name Kemamine° Q2803-C by Humko 15 Chemical Division of Witco Chemical Corporation; soyadimethylethylammoni um ethosul fate wherei n R4 i s a C16-Cla hydrocarbon group , R5 i s a methyl group. R6 is an ethyl group, and A is an ethylsulfate anion:

sold under the trade name Jordaquat° 1033 by Jordan Chemical Company;

and methyl-bis(2-hydroxyethyl)octadecylammonium chloride wherein R4 20 is a Cla hydrocarbon group. R5 is a 2-hydroxyethyl group and R6 is a methyl group and available under the trade name Ethoquad° 18/12 from Armak Company.

An example of Component I(b)(iii) is 1-ethyl-1-(2-hydroxy ethyl)-2-isoheptadecylimidazolinium ethylsulfate wherein R, is a C1, 25 hydrocarbon group.

Rz is an ethylene group, R5 is an ethyl group, and A is an ethylsulfate anion.

It is available from Mona Industries, Inc., under the trade name Monaquat~ ISIES.

Component I(c) Preferred cationic nitrogenous salts having two or more long 30 chain acyclic aliphatic C15-C22 hydrocarbon groups or one said group and an arylalkyl group which can be used either alone or as part of a mixture are selected from the group consisting of:

WO 93/05138 PCT/US92/07015 2~~.55a.~0 - 22 (i) acyciic quaternary ammonium salts having the rormuia:

R4 8 R4 _ R5 A8 i N - i Rg wherein R4 is an acyclic aliphatic C15-C22 hydrocarbon group, R5 is a C1-C4 saturated alkyl or hydroxyalkvl group, Rg is selected from the group consisting of R4 and R5 groups, and Ae is an anion defined as above;

(ii) diamido quaternary ammonium salts having the formula:

~-- 0 R 5 0 ~ D 1 1 J 11 11 R1 - C - NH - R2 - N - R2 - NH - C - R1 A Rg wherein R1 is an acyclic aliphatic C15-C21 hydrocarbon group, R2 is a divalent alkylene group having 1 to 3 carbon atoms,- R5 and Rg are C1-C4 saturated alkyl or hydroxyalkyl groups, and A8 is an anion;

(iii) diamino alkoxylated quaternary ammonium salts having the formula:

R 5 ~ 1. ~ 1i R1 - C - NH - R2 - N - R2 - NH - C - R1 Ae (CH2CH20)nH wherein n is equal to 1 to about 5, and Rl, R2, R5 and Ag are as defined above;

WO 93/05138 ~ ~ ;~ ~ PCT/US92/07015 - 23 (iv) quaternary ammonium compounds having the formula:

R5 ~ A i I --v, R4 _ N _ CH2 i R5 wherein R4 is an acyclic aliphatic CI5-C22 hydrocarbon group, R5 is a CI-C4 saturated alkyl or hydroxyalkyl group, A8 is an anion;

(v) substituted imidazolinium salts having the formula:

I N _ CN2 I D i5 i R1 _ C ~ I ~ AA ~ N - CH2 0 RI - C - NH - R2 R5 wherein RI is an acyclic aliphatic CI5-C2I hydrocarbon group, R2 is a divalent alkylene group having I to 3 carbon atoms, and R5 and Ae are as defined above; and (vi) substituted imidazolinium salts having the formula:

N - CH2 RI _ C ~ A8 ~ N - CH2 0 R1 - C - NH - R2 H wherein RI, RZ and Ae are as defined above;

and mixtures thereof.

Examples of Component I(c)(i) are the well-known dialkyldimethylammonium salts such as ditallowdimethylammonium chloride.

CA 02115540 1999-O1-08 - 24 ditallowdimethylammonium methylsulfate, di(hydrogenated tallow)dimethylammonium chloride.distearyldimethylammonium chloride.

dibehenyldimethylammonium chloride.

Di(hydrogenated tallow)dimethylammonium chloride and ditallowdimethylammonium 5 chloride are preferred.

Examples of commercially available dialkyldimethylammonium salts usable in the present invention are di(hydrogenated tallow)dimethylammonium chloride (trade name Adogen 442), ditallowdimethylammonium chloride (trade name Adogen 470), distearyldimethylammonium chloride (trade name Arosurf° TA-100), all 10 available from Sherex Chemical Company.

Dibehenyldimethylammonium chloride wherein R4 is an acyclic aliphatic CzZ hydrocarbon group is sold under the trade name Kemamine Q-2802C by Humko Chemical Division of Witco Chemical Corporation.

Examples of Component I(c)(ii) are methylbis(tallowamido 15 ethyl)(2-hydroxyethyl)ammonium methylsulfate and methylbis(hy drogenated tallowamidoethyl)(2-hydroxyethyl)ammonium methylsulfate wherei n R1 i s an acycl i c a 1 i phati c C15-Cl~ hydrocarbon group . R2 i s an ethylene group, R5 is a methyl group. R9 is a hydroxyalkyl group and A is a methylsulfate anion; these materials are available from Sherex 20 Chemical Company under the trade names Varisoft 222 and Varisoft 110.

respectively.

An example of Component I(c)(iv) is dimethylstearylbenzylammonium chloride wherein R4 is an acyclic aliphatic C18 hydrocarbon group. RS is a methyl group and A is a chloride anion, and is sold 25 under the trade names Varisoft SDC by Sherex Chemical Company and Ammonyx~ 490 by Onyx Chemical Company.

Examples of Component I(c)(v) are 1-methyl-1-tallowamidoethyl-2-tallowimidazolinium methylsulfate and 1-methyl-1-(hydrogenated tallowamidoethyl)-2-(hydrogenated tallow)imidazolinium 30 methylsulfate wherein R1 is an acyclic aliphatic C15-C1, hydrocarbon group. R2 is an ethylene group. R5 is a methyl group and A is a chloride anion: they are sold under the trade names Varisoft 475 and Varisoft 445, respectively, by Sherex Chemical Company.

A preferred composition contains Component I(a) at a level of 35 from about 10~ to about 80~, Component I(b) at a level of from about 5~ to about 40~, and Component I(c) at a level of from about 10~ to about 80~, by weight of said Component I. A more preferred CA 02115540 1999-O1-08 - 25 composition contains Component I(c) which is selected from the group consisting of: (i) di(hydrogenated tallow)dimethylammonium chloride and (v) methyl-1-tallowamidoethyl-2-tallowimidazolinium methylsulfate: and mixtures thereof.

5 Component I is preferably present at from about 4% to about 27% by weight of the total composition.

More specifically, this composition is more preferred wherein Component I(a) is the reaction product of about 2 moles of hydrogenated tallow fatty acids with about 1 mole of N-2-hydroxyethylethylenediamine and is present at a 10 level of from about 20% to about 60% by weight of Component I; and wherein Component I(b) is mono(hydrogenated tallow)trimethylammonium chloride present at a level of from about 3% to about 30% by weight of Component I: and wherein Component I(c) is selected from the group consisting of di(hydrogenated tallow)dimethylammonium chloride, 15 ditallowdimethylammonium chloride and methyl-1-tallowamidoethyl2-tallowimidazolinium methylsulfate, and mixtures thereof; said Component I(c) is present at a level of from about 20% to about 60% by weight of Component I: and wherein the weight ratio of said di(hydrogenated tallow)dimethylammonium chloride to said methyl-120 tallowamidoethyl-2-tallowimidazolinium methylsulfate is from about 2:1 to about 6:1.

The above individual components can also be used individually.

especially those of I(c).

Anion A 25 In the cationic nitrogenous salts herein, the anion AB provides charge neutrality.

Most often. the anion used to provide charge neutrality in these salts is a halide, such as fluoride. chloride, bromide, or iodide.

However, other anions can be used, such as methylsulfate. ethylsulfate. hydroxide. acetate, formate, sulfate, 30 carbonate. and the like.

Chloride and methylsulfate are preferred herein as anion A.

7. LIQUID CARRIER The liquid carrier is selected from the group consisting of water, C1-C4 monohydric alcohols.

Cz-C6 polyhydric alcohols (e. g..

35 alkylene glycols like propylene glycol), liquid polyalkylene glycols such as polyethylene glycol with an average molecular weight of about 200, and mixtures thereof.

The water which is Vpj ~~ ~ij "" - 26 used can be distilled. deionized, or tap water.

8. POLYMERIC SOIL RELEASE AGENTS Soil release agents, usually polymers, are essential additives at levels of from about 0.05% to about 5%.

Suitable soil release agents are disclosed in U.S.

Pat.

Nos.: 4,702.857, Gosselink. issued Oct. 27. 1987; 4.711,730, Gosselink and Diehl, issued Dec. 8, 1987;

4,713.194, Gosselink issued Dec. 15. 1987; 4,877,896.

Maldonado.

Trinh, and Gosselink, issued Oct. 31, 1989: 4,956,447, Gosselink, Hardy, and Trinh, issued Sep. 11, 1990: and 4,749,596, Evans, Huntington, Stewart, Wolf, and Zimmerer, issued June 7, 1988.

It is a special advantage of the soil release polymers, that they improve the suspension stability of particles in the liquid fabric softener compositions, i.e., the particles remain stably suspended in the liquid compositions without excessive separation occurring.

The soil release agent usually does not substantially increase viscosity.

This result was totally unexpected.

However, it allows the preparation of the stable fabric softener compositions with the additional benefit of improved soil release in the next wash without having to incur the expenses and formulation difficulties that accompany the addition of a material solely for the purpose of stably suspending the particles.

A special advantage of using a soil release polymer to suspend the protected particles herein, is the minimization of buildup on fabrics from the protective material.

Without the soil release polymer the protective material, especially hydrocarbons, tend to deposit on, and build up from extended use, especially on synthetic fabrics (e. g., polyesters).

Especially desirable ingredients are polymeric soil release agents comprising block copolymers of polyalkylene terephthalate and polyoxyethylene terephthalate, and block copolymers of polyalkylene terephthalate and polyethylene glycol.

The polyalkylene terephthalate blocks preferably comprise ethylene and/or propylene alkylene groups.

Many of such soil release polymers are nonionic.

A preferred nonionic soil release polymer has the following average structure:

SRP I: CH30(CHzCHzO)QO[C(0)-O-C(0)-OCH2CH(CH3)0~5 C ( 0 )-O-C ( 0 ) ( OCHzCH2 ) 4o0CH3 f ; a :r# q ~ ~.; ~' ~ 'vi F ~.~ r ~>

- 27 Such soil release polymers are described in U.S.

Pat.

No.

4,849,257, Borcher, Trinh and Bolich, issued July 18, 1989.

Another highly preferred nonionic soil release polymer is described in copending PCT Application WO 92/17523, published October 15, 1992, by Pan, Gosselink, and Honsa, for Nonionic Soil Release Agents.

The polymeric soil release agents useful in the present invention can include anionic and cationic polymeric soil release agents.

Suitable anionic polymeric or oligomeric soil release agents are disclosed in U.S.

Pat.

No. 4,018,569, Trinh, Gosselink and Rattinger. issued April 4, 1989.

Other suitable polymers are disclosed in U.S.

Pat.

No.a 4,808.0860 Evans, Huntington, Stewart, Wolf, and Zimmerern issued Feb. 24, 1989.

Suitable cationic soil release polymers are described in U.S.

Pat.

No. 4,956,447.

Gosselink, Hardy, and Trinh, issued Sept. 11. 1990.

The level of soil release polymer, typically is from about 0.05% to about 5%. preferably from about 0.1% to about 4%, more preferably from about 0.2% to about 3%.

9. OTHER OPTIONAL INGREDIENTS A preferred optional ingredient is free perfume, other than the perfume which is present as the perfume/cyclodextrin complex. which is also very useful for imparting odor benefits, especially in the product and/or in the rinse cycle and/or in the dryer.

Preferably, such uncomplexed perfume contains at least about 1%, more preferably at least about 10% by weight of said uncomplexed perfume, of substantive perfume materials.

Such uncomplexed perfume is preferably present at a level of from about 0.01% to about 5%, preferably from about 0.05% to about 2%, more preferably CA 02115540 1999-O1-08 - 28 from about 0.1~ to about 1~, by weight of the total composition.

Other adjuvants can be added to the compositions herein for their known purposes.

Such adjuvants include, but are not limited to, viscosity control agents, uncomplexed perfumes, emulsifiers, 5 preservatives, antioxidants, bacteriocides, fungicides, brighteners, opacifiers, freeze-thaw control agents, shrinkage control agents, and agents to provide ease of ironing.

These adjuvants. if used, are added at thei r usual 1 evel s , general ~Iy each of up to about 5~ by weight of the composition.

10 Viscosity control agents can be organic or inorganic in nature.

Examples of organic viscosity modifiers (lowering) are aryl carboxylates and sulfonates (e. g., benzoate. 2-hydroxybenzoate, 2-aminobenzoate, benzenesulfonate, 2-hydroxybenzenesulfonate.

2-aminobenzenesulfonate, etc.), fatty acids and esters, fatty 15 alcohols, and water-miscible solvents such as short chain alcohols.

Examples of inorganic viscosity control agents are water-soluble ionizable salts. A wide variety of ionizable salts can be used.

Examples of suitable salts are the halides of the group IA and IIA metals of the Periodic Table of the Elements, e.g., calcium chloride, 20 magnesium chloride, sodium chloride, potassium bromide, and lithium chloride.

Calcium chloride is preferred.

The ionizable salts are particularly useful during the process of mixing the ingredients to make the compositions herein, and later to obtain the desired viscosity.

The amount of ionizable salts used depends on the amount 25 of active ingredients used in the compositions and can be adjusted according to the desires of the formulator.

Typical levels of salts used to control the composition viscosity are from about 20 to about 6,000 parts per million (ppm), preferably from about 20 to about 4,000 ppm by weight of the composition.

30 Viscosity modifiers (raising) can be added to increase the ability of the compositions to stably suspend particles, e.g., the protected particles or other water-insoluble particles.

Such materials include hydroxypropyl substituted guar gum (e. g., Jaguar HP200, available from Rhone-Poulenc), cationic modified acrylamide 35 (e. g., Floxan EC-2000, available from Henkel Corp.), polyethylene glycol (e. g., Carbowax 20M from Union Carbide), hydrophobic 21~~~~ ~J WO 93/05138 PGT/US92/07015 - 29 modified hydroxyethyicellulose (e. g.. ~Jatrosol Plus from Aqualon).

and/or organophilic clays (e. g., Hectorite and/or Bentonite clays such as Bentones 27, 34 and 38 from Rheox Co.).

These viscosity raisers (thickeners) are typically used at levels from about 500 ppm to about 30,000 ppm, preferably from about 1,000 ppm to about 5,000 ppm, more preferably from about 1,500 ppm to about 3.500 ppm.

Examples of bacteriocides used in the compositions of this invention are glutaraldehyde, formaldehyde, 2-bromo-2-nitropro pane-1,3-diol sold by Inolex Chemicals under the trade name Bronopol~, and a mixture of 5-chloro-2-methyl-4-isothiazolin-3-one and 2-methyl-4-isothiazoline-3-one sold by Rohm and Haas Company under the trade name Kathon~ CG/ICP.

Typical levels of bacterio cides used in the present compositions are from about 1 to about 1,000 ppm by weight of the composition.

Examples of antioxidants that can be added to the compositions of this invention are propyl gallate, availale from Eastman Chemical Products, Inc., under the trade names Tenox~ PG and Tenox S-1, and butylated hydroxy toluene, available from UOP Process Division under the trade name Sustane~ BHT.

The present compositions can contain silicones to provide additional benefits such as ease of ironing and improved fabric feel.

The preferred silicones are polydimethylsiloxanes of viscosity of from about 100 centistokes (cs) to about 100,000 cs, preferably from about 200 cs to about 60,000 cs and/or silicone gums.

These silicones can be used in emulsified form, which can be conveniently obtained directly from the suppliers.

Examples of these preemulsified silicone s are 60%. emulsion of polydimethylsiloxane (350 cs) sold by Dow Corning Corporation under the trade name DOW CORNING~ 1157 Fluid and 50%. emulsion of polydimethylsiloxane (10,000 cs) sold by General Electric Company under the trade name General Electrice SM 2140 Silicones.

Microemulsions are preferred, especially when the composition contains a dye.

The optional silicone component can be used in an amount of from about 0.1°o to about 6%. by weight of the composition.

WO 93/05138 PCT/US92/07015 - 30 2~~554~ Silicone foam suppressants can also be used.

These are usually not emulsified and typically have viscositiess of from about 100 cs to about 10,000 cs, preferably from about 200 cs to about 5.000 cs.

Uery low levels are used, typically from about 0.01% to about 1%, preferably from about 0.02% to about 0.5%.

Another preferred foam suppressant is a silicone/silicate mixture, e.g., Dow Corning's Antifoam A.

A preferred composition contains from 0% to about 3% of polydimethylsiloxane, from 0% to about 0.4% of CaCl2, and from about 10 ppm to about 100 ppm of dye.

The pH (10% solution) of the compositions of this invention is generally adjusted to be in the range of from about 2 to about 7, preferably from about 2.4 to about 6.5, more preferably from about 2.6 to about 4.

Adjustment of pH is normally carried out by :5 including a small quantity of free acid in the formulation.

Because no strong pH buffers are present, only small amounts of acid are required.

Any acidic material can be used; its selection can be made by anyone skilled in the softener arts on the basis of cost, availability, safety, etc.

Among the acids that can be used are methyl sulfonic, hydrochloric, sulfuric, phosphoric, citric, malefic, and succinic.

For the purposes of this invention, pH is measured by a glass electrode in a 10%. solution in water of the softening composition in comparison with a standard calomel reference electrode.

z5 The liquid fabric softening compositions of the present invention can be prepared by conventional methods. A convenient and satisfactory method is to prepare the softening active premix at about 72'-77'C, which is then added with stirring to the hot water seat.

Temperature-sensitive optional components can be added after the fabric softening composition is cooled to a lower temperature.

The liquid fabric softening compositions of this invention are used by adding to the rinse cycle of conventional home laundry operations.

Generally, rinse water has a temperature of from about 5'C to about 50'C, more frequently from about 10'C to about 40'C.

The concentration of the fabric softener actives of this invention is generally from about 10 ppm to about 200 ppm, pref CA 02115540 1999-O1-08 - 31 erably from about 25 ppm to about 100 ppm, by weight of the aqueous rinsing bath.

The cyclodextrin/perfume complex is at a concentration of from about 5 ppm to about 200 ppm, preferably from about 10 ppm to about 150 ppm, more preferably from about 10 ppm to about 50 ppm.

5 In general, the present invention in its fabric softening method aspect comprises the steps of (1) washing fabrics in a conventional washing machine with a detergent composition: and (2) rinsing the fabrics in a bath which contains the above described amounts of the fabric softeners and protected cyclodextrin/perfume complex 10 particles; and (3) drying the fabrics in an automatic laundry dryer.

When multiple rinses are used. the fabric softening composition is preferably added to the final rinse.

10. COMPOSITIONAL ADVANTAGES OF THE PRESENT INDENTION As discussed hereinbefore, the ability to have a product with 15 low product perfume odor and an acceptable initial fabric perfume odor, but also have a long-lasting fabric perfume odor has been the goal of many development projects for consumer laundry products.

The products of this invention preferably only contain enough free perfume to deliver both an acceptably low "product perfume odor" and 20 an acceptable "initial fabric perfume odor." Perfume incorporated into the product in the form of protected particles containing perfume complexed with cyclodextrin (CD), will be released primarily when the fabric is used in situations where renewed perfume odor is real 1 y and appropri atel y needed , a . g . , when some moi sture i s present .

25 such as when usi ng wash cl oths and towel s i n a bathroom, or when there is perspiration odor on clothes during and after a high level of physical activity.

The products of this invention can contain only the protected perfume/CD complex, without any noticeable amount of free perfume.

30 In this case, the products initially appear to be unscented products.

Fabrics treated with these products do not carry any obvious perfume odor that can "clash" with other expensive personal fragrances that the consumer may wish to wear.

Only when extra perfume is needed.

such as for bathroom use, or for perspiration, is the perfume in the 35 complex released.

During storage of the treated fabrics, a small amount of perfume can escape from the complex as a result of the equilibrium between CA 02115540 1999-O1-08 - 32 the perfume/CD complex and free perfume and CD, and a light scent is obtained.

If the product contains both free and complexed perfume, this escaped perfume from the complex contributes to the overall fabric perfume odor intensity, giving rise to a longer lasting fabric 5 perfume odor impression.

Thus, by adjusting the levels of free perfume and perfume/CD complex it is possible to provide a wide range of unique perfume profiles in terms of timing and/or perfume identity and character.

The protected perfume/cyclodextrin complex particles are usually 10 incorporated into the liquid, rinse-added. fabric conditioning compositions.

Therefore, the invention also encompasses a process (method) for imparting long-lasting perfume benefits plus softening and/or antistatic effects to fabrics in an automatic laundry washer/dryer processing cycle comprising: washing said fabrics:

15 rinsing said fabrics with an effective, i.e.. softening, amount of a composition comprising softening actives) and an effective amount of protected perfume/CD particles; and tumbling said fabrics under heat in said dryer with said protected perfume/CD complex particles to effectively release said perfume/CD complex particles.

20 Thi s i nventi on al so contri butes to the aestheti cs of the cl othes washing process.

One important point in the laundry process where the consumer appreciates the odor (fragrance) is during the wash process (i.e., from the wash water and during the transfer of wet clothes to the dryer).

This aesthetic benefit is currently provided 25 mainly by the perfume added via the detergent composition or liquid softener composition to the wash and/or rinse water.

Clothes that have been pretreated, e.g.. in the previous rinse with the methods of this invention and machine dried, give off a burst of fragrance in the wash water, and the resulting fabrics are "perfumy" even 30 though no other perfume is used in the washing, rinsing and/or drying steps.

11. OTHER COMPOSITIONS In addition to the liquid fabric softener compositions described hereinbefore, the protected particles. especially protected 35 cyclodextrin/perfume complex particles, can be added to solid particulate softener compositions and detergent compositions.

CA 02115540 1999-O1-08 - 33 (a) Solid Particulate Detergent Compositions In detergent compositions. the amount of protective material should be higher, e.g., at least about 100 of the water sensitive material.

5 The protected particles, especially those containing perfume/cyclodextrin complexes can be formulated into granular detergent compositions by simple admixing.

Such detergent compositions typically comprise detersive surfactants and detergency builders and, optionally, additional ingredients such as bleaches.

10 enzymes, fabric brighteners and the like.

The particles are present in the detergent composition at a level sufficient to provide from about 0.5~ to about 30~. and preferably from about l~ to about 5~ of cyclodextrin/perfume complex in the detergent composition.

The remainder of the detergent composition will comprise from about 1~ 15 to about 50~, preferably from about 109 to about 25~ detersive surfactant, and from about 10~ to about 70~, preferably from about 20~ to about 50~ of a detergency builder, and, if desired, other optional laundry detergent components.

Vii) The Surfactant 20 Surfactants useful in the detergent compositions herein include well-known synthetic anionic, nonionic, amphoteric and zwitterionic surfactants.

Typical of these are the alkyl benzene sulfonates.

alkyl- and alkylether sulfates, paraffin sulfonates, olefin sulfonates, alkoxylated (especially ethoxylated) alcohols and alkyl 25 phenols, amine oxides, alpha-sulfonates of fatty acids and of fatty acid esters, alkyl betaines, and the like, which are well known from the detergency art.

In general, such detersive surfactants contain an alkyl group in the C9-C18 range.

The anionic detersive surfactants can be used in the form of their sodium, potassium or triethanol30 ammonium salts: the nonionics generally contain from about 5 to about 17 ethyl ene oxi de groups . C11-C16 al kyl benzene sul fonates . C12-Cl8 paraffin-sulfonates and alkyl sulfates are especially preferred in the compositions of the present type.

r - 34 A detailed listing of suitable surfactants for the detergent compositions herein can be found in U.S.

Pat.

No.: 3,936,537, Baskerville, issued Feb. 3, 1976.

Commercial sources of such surfactants can be found in McCutcheon's EMULSIFIERS AND DETERGENTS, North American Edition, 1987, McCutcheon Division, MC Publishing Company.

(ii) Deteraency Builders Useful detergency builders for the detergent compositions herein include any of the conventional inorganic and organic water-soluble builder salts, as well as various water-insoluble and so-called "seeded" builders.

Nonlimiting examples of suitable water-soluble, inorganic alkaline detergent builder salts include the alkali metal carbonates.

borates, phosphates, polyphosphates,tripolyphosphates, bicarbonates, silicates, and sulfates.

Specific examples of such salts include the sodium and potassium tetraborates, bicarbonates, carbonates, tripolyphosphates, pyrophosphates, and hexametaphosphates.

Examples of suitable water-soluble organic alkaline detergency builder salts are: (1) water-soluble amino polyacetates, e.g., sodium and potassium ethylenediaminetetraacetates, nitrilotriacetates, and N-(2-hydroxyethyl) nitrilodiacetates; (2) water-soluble salts of phytic acid, e.g., sodium and potassium phytates; (3) water-soluble polyphosphonates, including sodium, potassium and lithium salts of ethane-1-hydroxy-1, 1-diphosphonic acid, sodium, potassium, and lithium salts of methylenediphosphonic acid and the like.

" Insol ubl e" bui 1 dens i ncl ude both seeded bui 1 ders such as sodi um carbonate or sodi um si 1 i cate, seeded with cal ci um carbonate or bari um sulfate; and hydrated sodium Zeolite A having a particle size of less than about 5 microns.

A detailed listing of suitable detergency builders can be found in U.S.

Pat.

No.: 3,936,537, supra.

.~" _ 35 (iii) Optional Detergent Ingredients Optional detergent composition components include enzymes (e. g., proteases and amylases). halogen bleaches (e. g., sodium and potassium dichloroisocyanurates), peroxyacid bleaches (e. g., diperoxydodecane1,12-dioic acid), inorganic percompound bleaches (e. g., sodium perborate), activators for perborate (e. g.. tetraacetylethylenediamine and sodium nonanoyloxybenzene sulfonate), soil release agents (e. g., methylcellulose, and/or nonionic polyester soil release polymers, and/or anionic polyester-soil release polymers, especially the anionic polyester soil release polymers disclosed in U.S.

Pat.

No.: 4,877,896.

Maldonado, Trinh, and Gosselink, issued Oct. 31, 1989, soil suspending agents (e. g., sodium carboxymethylcellulose) and fabric brighteners.

(b) Solid Particulate Fabric Softener Compositions Particulate fabric softener compositions for addition in the wash or rinse cycles of an automatic laundering operation have been described in, e.g. > U.S.

Pat.

Nos.: 3,256,180, Weiss, issued June 14, 1966: 3,351.483, Miner et al., issued Nov. 7, 1967; 4,308,151, Cambre, issued Dec. 29, 1981; 4,589,989, Muller et al., issued May 20, 1986: and 5,009.800, Foster, issued April 23, 1991; and foreign patent applications: Jap.

Laid Open Appln.

No.: 8799/84, laid open Jan. 18. 1984: Jap.

Appln.

No.: J62253698-A, Nov. 5. 1987; Jap.

Laid Open Appln.

No.: 1-213476, laid open Aug. 28, 1989; Can.

Appln.

No.:

CA1232819-A, Feb. 16, 1988; Jap.

Appln.

No.: J63138000-A, June 9, 1988: and European Appln.

No.: EP-289313-A.

Nov. 2, 1988. A granular fabric softener composition which can be used to prepare a liquid composition is disclosed in U.S.

Pat.

No.: 5,185,088, Hartman.

Brown, Rusche and Taylor, issued February 9, 1993.

The fabric softener is typically present at a level of from about 20~ to about 90~, preferably from about 30% to about 70~, in such particulate fabric softener compositions.

The cyclodextrin/ perfume complex, as the protected particles, is used at a level of from about 5~ to about 80~, preferably from about 10~ to B WO 93/05138 PCT/US92/07015 ,: M - 36 about 7u~~°,o, in such particulate fabric softener compositions.

When the particuiate softener is to be added in the rinse cycle.

water-swellable protective material can be used.

When the composition is to be added in the wash cycle or formed into an aqueous composition, the protective material is preferably nonwater-swellable and is used at higher levels.

All percentages, ratios, and parts herein are by weight unless otherwise stated.

The following are nonlimiting examples of the instant articles and methods.

Three different perfumes used in the following Examples are as follows:

Comolete.Perfume (A Perfume A is a substantive perfume which is composed mainly of moderate and nonvolatile perfume ingredients.

The major ingredients of Perfume A are benzyl salicylate, para-tertiarybutyl cyclohexyl acetate, para-tertiary-butyl-alpha-methyl hydrocinnamic aldehyde, citronellol, coumarin, galaxolide, heliotropine, hexyl cinnamic aldehyde, 4-{4-hydroxy-4-methyl pentyl)-3cyclhexene-10-carboxaldehyde, methyl cedrylone, gamma-methyl ionone, and patchouli alcohol.

Perfume lBl (More Volatile Portion of Perfume A1 Perfume B is a rather nonsubstantive perfume which is composed mainly of highly and moderately volatile fractions of Perfume A.

The major ingredients of Perfume B are linalool, alpha terpineol, citronellol, linalyl acetate, eugenol, flor acetate, benzyl acetate, amyl salicylate, phenylethyl alcohol and aurantiol.

Complete Perfume (C1 Perfume C is an essential oil added "free," without any protection or encapsulation, that provides fragrance to rinse added fabric softeners and odor-on-fabric benefits to fabrics treated with said softeners.

It contains both substantive and non-substantive perfume ingredients.

The above-defined perfumes and others, as defined hereinafter, are used to form the following complexes, which are used in the Examples herein.

WO 93/05138 ~ ~ ~ ~ ~ ~ ~ PCT/US92/07015 - 37 Complex 1- Perfume B/B-CD A mobile slurry is prepared by mixing about 1 kg g of S-CD and 1,000 mi of water in a stainless steel mixing bowl of a KitchenAid mixer using a plastic coated heavy-duty mixing blade.

Mixing is continued while about 176 g of Perfume B is slowly added.

The liquid-like slurry immediately starts to thicken and becomes a creamy paste.

Stirring is continued for 25 minutes.

The paste is now dough-like in appearance.

About 500 ml of water is added to the paste and blended well.

Stirring is then resumed for an additional 25 minutes.

During this time the complex again thickens, although not to the same degree as before the additional water is added.

The resulting creamy complex is spread in a thin layer on a tray and allowed to air dry.

This produces about 1100 g of granular solid which is ground to a fine powder.

The complex retains some free perfume and still has a residual perfume odor.

Complex 2 The remaining water in Complex 1 is removed by freeze drying, after which Complex 1 loses about 1f. of its weight.

The relatively nonsubstantive Perfume .B is surprisingly effective when incorporated in the fabric conditioning compositions and products described hereinafter.

Complex 3 Complex 3 is prepared like Complex 1 with Perfume C replacing Perfume B.

Protected Complex Particles 1 About 200 g of Vybar 260 polyolefin wax obtained from Petrolite Corp. is melted at about 60'C.

About 100 g of Complex 1 is blended with the molten Vybar 260 wax, using a Silverson L4R high shear mixer.

The well blended mixture is transferred to a tray, allowed to solidify, and coarsely divided.

The Vybar 260/complex solid mixture is cryogenically ground into small particles using liquid nitrogen.

About 300 ml of liquid nitrogen is placed in a Waring Commercial Blender Model 31BL91 having a 1,000-mi stainless steel blender jar with a stainless steel screw cover.

When the effervescence of the nitrogen subsides, about 25 g of the coarsely divided Vybar 260/complex solid mixture is added to the jar and ground for about ZO to 30 seconds.

The remainder of the Vybar WO 93/05138 PCT/US92/07015 2115~~0 - 38 260/complex solid mixture is ground in the same manner.

The ground materi al i s screened through s i eves to obtai n about 236 g of Vybar 260-Protected (Cyclodextrin/Perfume) Complex Particles 1 of a size equal or smaller than about 250 microns in diameter.

Protected Complex Particles 2 The Vybar 260-Protected (Cyclodextrin/Perfume) Complex Particles 2 are made similarly to Protected Complex Particles 1.

but Complex 1 is replaced by Complex 2.

Protected Complex Particles 3 The Vybar 103-Protected (Cyclodextrin/Perfume) Complex Particles 3 are made similarly to Protected Complex Particles 2, but the Vybar 260 wax is replaced by Vybar 103 polyolefin wax (obtained from Petrolite Corp.), which melts at about 90'C.

_Protected Complex Particles 4 The protected particles are prepared by dispersing about 50g of cyclodextrin/perfume Complex 3 in about 100g of molten Vybar 260 with high shear mixing at about 70'C.

About 45g of this molten blend is then dispersed in about 600g of an aqueous fabric softener composition with high shear mixing.

Mixing is continued for sufficient time to assure good formation of Protected Complex Particles 4, followed by cooling to room temperature with stirring.

The Protected Complex Particle 4 is a smooth, spherical, small particle (diameter about 30 microns) suspended in an aqueous fabric softener composition (Example 12, as disclosed hereinafter).

Particle size can be varied by the extent/duration of high shear mixing before cooling.

Examples of Liouid Fabric Conditioning Compositions Nonlimiting Examples and Comparative Examples of liquid fabric conditioning compositions are given below to illustrate the advantage of the present invention.

WO 93/05138 ~ ~ ~ ~ '~ ~ PCT/US92/07015 - 39 Comparative Example 1 Example Example 2 3 Components Wt.% Wt.% Wt.% Ditallowdimethyl Ammonium Chloride (DTDMAC) (a) 4.50 4.50 4.50 Perfume A - 0.35 0.35 Protected Complex Particles 2 6.00 6.00 Minor Ingredients (b) 0.20 0.20 0.20 Deionized Water Balance Balance Balance 100.00 100.00 100.00 (a) DTDMAC - -83% = about 9.6%/68.7%/5.3% - mono-/di-/tritallowalkylammonium chloride in water/alcohol solvent.

As used hereinafter, DTOMAC has this composition.

(b) Includes polydimethylsiloxane emulsion containing 55 wt.% of a polydimethylsiloxane having a viscosity of about 350 cent.istokes, and antifoam agent.

EXAMPLE 1 The composition of Example 1 is made by adding molten DTDMAC (at about 75'C) with high shear mixing to a mixing vessel containing deionized water and antifoaming agent, heated to about 45'C.

When the mixture has been thoroughly mixed, the polydimethylsiloxane emulsion is added and allowed to cool to room temperature.

Protected Complex Particles 2 are then added with mixing.

EXAMPLE 2 The composition of Example 2 is made similarly to that of Example 1, except that after the addition of the polydimethyl siloxane emulsion, the mixture is cooled to about 40'C, the free Perfume A is blended in, and the mixture is cooled further to room temperature before Protected Complex Particles 2 are added with mixing.

COMPARATIVE EXAMPLE 3 The composition of Comparative Example 3 is made similarly to that of Example 2, except that no Protected Complex Particles 2 are incorporated.

WO 93/05138 PCT/US92/07015 2~155~~J - 40 Examoie 4 Example 5 Components Wt.% Wt.,o DTDMAC 4.82 4.82 1-Tallowamidoethyl-2- tallow Imidazoiine 2.00 2.00 Monotallowalkyltrimethyl- ammonium Chloride (MTTMAC) Solution (46%) 0.67 0.67 Lytron 621 (40%) 0.75 0.75 Soil Release Polymer (SRP I) - 0.75 (b) Perfume A 0.35 0.35 Protected Complex Particles 1 11.00 11.00 Minor Ingredients (a) 0.20 0.28 Hydrochloric Acid to pH 2.8 to pH 2.8 Deionized Water Balance Balance 100.00 100.00 (a) As in Example 1.

(b) Structure given hereinbefore.

XAMP 4 The composition of Example 4 is made by first melting and mixing 1-tallowamidoethyl-Z-tallow imidazoline, molten at about 85'C, to a mixture of DTDMAC and MTTMAC, molten at about 75'C, in a premix vessel.

This premix is then added with high shear mixing to a mix vessel containing deionized water, Lytron 621 opacifying agent, antifoaming agent and CaCl2, heated to about 70'C. A small amount of concentrated HCl is also added to adjust the pH of the composition to about 2.8-3Ø When the mixture is thoroughly mixed, the polydimethylsiloxane emulsion is added and allowed to cool to about 40'C where free Perfume A is added with mixing.

The mixture is allowed to cool further to room temperature, then Protected Complex Particles 1 are added with mixing.

E)(AMPLE 55 The composition of Example 5 is made similarly to that of Example 4, except that the water phase also contains the soil release polymer. SRP I, and extra foam suppressing agent (about WO 93/05138 ~ ~ 1 ~ 5 ~ ~ PCT/US92/07015 - 41 0.08% of poiydimethylsiloxane of about 500 cs) is added as the final step. Comparative Example 6 Example 7 Components Wt.% Wt.% DTDMAC 4.82 4.82 1-Tallowamidoethyl-2- tallow Imidazoline 2.00 2.00 MTTMAC Solution (46%) 0.67 0.67 Lytron 621 (40~) 0.75 0.75 SRP I 0.75 0.75 Perfume A 0.35 0.35 Protected Complex Particles 3 11.00 Minor Ingredients (a) 0.20 0.20 Hydrochloric Acid to pH 2.8 to pH 2.8 Oeionized Water Balance Balance 100.00 100.00 (a) As in Example 4.

XAMP 6 The composition of Example 6 is made similarly to that of Example 5, except that Protected Complex Particles 1 are replaced by Protected Complex Particles 3.

COMPARATIVE EXAMPLE 7 The composition of Comparative Example 7 is made similarly to that of Example 6, except that no Protected Complex Particles are incorporated.

Examoi a 8 Components Wt.% DTDMAC 47~20 Polyethylene Glycol 200 23.60 Ethanol 7.08 Protected Complex Particles 2 22.12 100.00 EXAMP 8 The composition of Example 8 has a nonaqueous liquid carrier.

CA 02115540 1999-O1-08 - 42 Polyethylene glycol of average molecular weight of about 200 and DTDMAC are melted and thoroughlymixed her at 70C, then toget about the mixture is allowed to cool nol is to room temperature.

Etha then added with thorough mixing. ally, Particles Fin Protected 2 Complex are added with mixing. Exa~l Exampl Exam~l a 9 a 10 a 11 Components Wt.~ Wt.~ Wt.~ DTDMAC 14.46 14.46 14.46 1-Tallowamidoethyl-2- tallow Imidazoline 6.00 6.00 6.00 Lytron 621 (40~) 0.75 0.75 0.75 SRP I - 2.25 2.25 Perfume A 1.05 1.05 Protected Complex Particles 33.00 33.00 4.40 1 Minor Ingredients (a) 0.58 0.58 0.58 Hydrochloric Acid to pH to pH 2.8 to pH 2.8 2.8 Deionized Water Balance Balance Balance 100.00 100.00 100.00 (a) As in Example 4.

EXAMPLE 9 The composition of Example 9 is made similarly to that of Example 4, except that most active ingredients are used at higher levels to obtain a concentrated composition.

EXAMPLE 10 25 The composition of Example 10 is made similarly to that of Example 5, except that most active ingredients are used at higher levels to obtain a concentrated composition.

EXAMPLE 11 The composition of Example 11 is made similarly to that of 30 Exampl a 10 , except that no free Perfume A i s added . and a 1 ower 1 evel of Protected Complex Particles 1 is used.

FABRIC TREATMENT Each laundry load is washed in a washer with the commercially available unscented TIDE° detergent.

An appropriate amount (see 35 Table) of each fabric conditioning composition is added to the rinse cycle.

The wet laundry load is transferred and dried in an electric tumble dryer.

The resulting dried fabric is smelled, then rewetted CA 02115540 1999-O1-08 - 43 by spraying with a mist water and of smelled again to see whether more perfume is released.The resultsaregivenin the Table.

Amount sed Perfume Released U osition per Treatment Upon Rewetting Com (g) p Example 1 about 68 g Yes Example 2 about 68 g Yes Comparative Example 3 about 68 g No Example 4 about 68 g Yes Example 5 about 68 g Yes Example about 68 g Yes 6 Comparative Example 7 about 68 g No Example 8 about 34 g Yes Example 9 about 30 g Yes Example 10 about 30 g Yes Example about 30 g Yes 11 Example 12 about 68 g Yes Comparative Example 13 about 68 g No PRODUCT STABILITY When the compositions that contain the Protected Complex Particles are stored overnight, those that contain soil release polymer ( 5 . 6. 10 , and 11 ) a re stabl a wi th most of the parti cl es remaining substantially uniformly dispersed in the liquid phase, while those not containing soil release polymer (1, 2, 4, and 9) have Protected Complex Particles settling down to the bottom of the 25 container.

EXAMPLE 12 The composition of Example 12 is made by first melting and mixing 1-tallowamidoethyl-2-tallow imidazoline (DTI), molten at about 85°C, to a mixture of DTDMAC and MTTMAC, molten at about 75°C, in a 30 premix vessel.

This premix is then added with high shear mixing to a mix vessel containing deionized water, at about 70°C, antifoaming agent and a small amount of concentrated HCl to adjust the pN of the composition to about 2.8-3Ø When the mixture is thoroughly mixed, the polydimethylsiloxane emulsion, Kathod CG preservative, and CaClz 35 are added ; and the mi xture i s al 1 owed to cool to about 60°C . A molten premix of Complex 3 and Uybar 260, at about 70°C. is added CA 02115540 1999-O1-08 - 44 with high shear mixing.

The size of Protected Complex Particles 4 is varied by the extent and duration of high shear mixing.

The mixture is allowed to cool further to room temperature. while stirring.

COMPARATIVE EXAMPLE 13 The composition of Comparative Example 13 is made by first melting and mixing 1-tallowamidoethyl-2-tallow imidazoline (TTI), molten at about 85°C, to a mixture of DTDMAC and MTTMAC, molten at about 75°C, in a premix vessel.

This premix is then added with high 10 shear mixing to a mix vessel containing deionized water, at about 70°C, antifoaming agent, and a small amount of concentrated HCl to adjust the pH of the composition to about 2.8-3Ø When the mixture is thoroughly mixed, the polydimethylsiloxane emulsion, Kathon CG preservative, and CaClz are added: and then allowed to cool to about 15 40°C when free Perfume C is added with mixing.

The mixture is allowed to cool further to room temperature.

Comparative Example 12 Example 13 Components Wt.~ Wt.~ 20 DTDMAC 4.22 4.54 TTI 3.15 3.40 MTTMAC (46~) 0.53 0.57 Perfume C - 0.38 Protected Complex Particles 4 7.00 25 Minor Ingredients 0.19 0.20 Kathon CG (1.5~) 0.03 0.03 Hydrochloric Acid to pH 2.8 to pH 2.8 Deionized Water Balance Balance 100.00 100.00 WO 93/05138 ~ ~ ~ ~ ~ ~ ~ PCT/US92/07015 - 45 EXAMPLE 14 A homogeneous mixture of cetyltrimethylammonium bromide (CTAB) and sorbitan monostearate (SMS) is obtained by melting SMS (about 165 g) and mixing CTAB (about 55 g) therein.

The solid softener product is prepared from this "co-melt" by one of two methods: (a) cryogenic grinding (-78'C) to form a fine powder, or (b) grilling to form 50-500 um particles.

Crvoaenic Grindin4:

The molten mixture is frozen in liquid nitrogen and ground in a Waring blender to a fine powder.

The powder is placed in a dessicator and allowed to warm to room temperature, yielding a fine, free flowing powder (granule).

Prillina The molten mixture (-88'C) falls -1.5 inches at a rate of about 65g/min. onto a heated (-150'C) rotating (-2,000 rpm) disc.

As the molten material is spun off the disk and air cooled (as it radiates outward), near-spherical granule particles (50-500 ~cm) form.

About 125 g of the Protected Complex Particles I are added to and intimately mixed with about 110 g of the solid particulate softener composition to form a complete perfumed product.

The solid particles are dispersed in warm water (40'C, 890 g) and vigorously shaken for approximately 1 minute to form a conventional liquid fabric softener product.

Upon cooling, the aqueous product remains in a homogeneous emulsified, or dispersed, state.

Addition of the liquid product to the rinse cycle of a washing process provides excellent softness, substantivity, and antistatic characteristics.

The product also gives to the treated fabrics a "rewet" perfume benefit.

EXAMPLE 15 A detergent composition is prepared by mixing about 10 parts of the Protected Complex Particles I with 90 parts of the follow ing granular detergent composition:

WO 93/05138 PCT/US92/07015 215540 - 46 - ~.

Ingredient Parts Na C13 linear alkyl benzene sulfonate 8.5 Na C14-C15 fatty alcohol sulfate 8.5 Ethoxylated C12-C13 fatty alcohol 0.05 Na2S04 29.8 Sodium silicate (1.6r) 5.5 Polyethylene glycol (M.W. 8,000) 0.5 Sodium polyacrylate 1.2 Sodium tripolyphosphate 5.6 Sodium pyrophosphate 22.4 Na2C03 12.3 Optical brightener 0.2 Protease enzyme (Alcalase) 0.7 Moisture 3.3 Sodium toluene/Xylene sulfonate 1.0 Total 100.0 EXAMPLE 16 Alternate granular detergent compositions are prepared by mixing about 15 parts of the Protected Particles I with Complex about 85 parts of the following granular t composition:

detergen In4redient Parts Na C13 linear alkyl benzene sulfonate 11.5 Na C14-C15 fatty alcohol sulfate 11.5 Ethoxylated C12-C13 fatty alcohol 1.9 Na2S04 14.0 Sodium silicate (1.6r) 2.3 Polyethylene glycol (M.W. 8,000) 1.8 Polyacrylic acid (M.W. 1,200) 3.5 Hydrated Zeolite A (-2 microns) 28.9 Na2C03 17.0 Optical brightener 0.2 Protease enzyme (Alcalase) 0.6 Moisture and Miscellaneous 7.0 Total 100.2 CA 02115540 1999-O1-08 - 47 Fabric Treatment Each laundry load is washed in an automatic washer with about 100 g of granular detergent composition of Example 15 or Example 16 in about 20 gal. of cold water.

The wet washed laundry load is 5 transferred to an automatic electric laundry tumble dryer and dried at a temperature of about 70°C.

The resulting dried fabric has low i ni ti a 1 perfume odor , but when wetted by sprayi ng wi th a mi st of water, a definite fragrance bloom is obtained.