Detergent compositions containing particle deposition enhancing agents

APPLICATIONS

This application is a continuation-in-part of the copending application of John J. Parran, Jr., Ser. No. 476,175, filed July 30, 1965, now abandoned.

BACKGROUND OF THE INVENTION

The field of this invention is detergent compositions including shampoos (liquid and cream), laundering, hardsurface and dishwashing detergents (granular and liquid), and personal use toilet detergent bars.

Various water-insoluble particulate substances have been incorporated in detergent products for the purpose of imparting some residual property or characteristic on surfaces washed with the products. For example, shampoo compositions containing particulate antidandruff agents have been developed which function by deposition and retention of the particulate agent on the hair and scalp during shampooing. Sufficient quantities of the deposited particulate agents are retained after rinsing to impart some degree of residual antimicrobial activity to the washed hair and scalp. Such antidandruff shampoo compositions are disclosed, for example, by Karsten, Taylor and Parran in U.S. Patent 3,263,733, granted Feb. 22, 1966.

Particulate antimicrobial substances have also been used in various laundry detergents and personal use toilet detergent bars to impart residual antimicrobial activity on the fabrics or skin surfaces washed with same. Such products are disclosed by Reller and Jordan in U.S. Patents 3,134,711, granted May 26, 1964, and 3,256,200, granted June 14, 1966.

Various other water-insoluble or sparingly soluble particulate materials such as sunscreens, fabric brighteners, and whiteners have been employed in detergent compositions and depend for their activity on particle deposition and retention on washed surfaces.

It is apparent that an effective detergent composition, properly used, will by its very nature tend to minimize retention of particulate matter on washed surfaces. Thus, only a relatively small proportion of particles present in such detergent compositions are actually retained after rinsing of the washed surface. Since the activity of antimicrobial and other particulate agents is in part a function of the quantity of particles deposited and retained on the involved surfaces, measures which enhance deposition and/or promote retention of such particles serve to reduce the quantity of the substance in the composition required to attain a given level of activity or increase the activity attainable with a given concentration of such particles.

SUMMARY OF THE INVENTION

It has now been discovered that polyethylenimine and alkoxylated polyethylenimine polymers having a molecular weight within the range from about 2,000 to about 3,000,000, and having a cationic charge density (as defined hereinafter) greater than .001 in aqueous solution, enhance the deposition and retention of water-insoluble or sparingly soluble particulate substances contained in detergent compositions on surfaces washed therewith.

Although the mechanism whereby this phenomenon occurs is not fully understood, it is believed that the polymer coats or attaches itself in some way on the involved particles imparting a net positive charge thereto which increases the affinity of the particle for the generally negatively charged washed surfaces.

It is therefore an object of this invention to provide detergent compositions which have improved capacities to impart residual activity or properties to surfaces washed therewith.

It is a further object of this invention to provide improved detergent compositions containing water-insoluble or sparingly soluble particulate substances which are deposited and retained on washed surfaces.

It is yet another object of this invention to provide a method for enhancing the deposition of particulate substances from detergent compositions and the retention of such substances on surfaces washed therewith.

These and other objects will become apparent from the following detailed description of the invention.

DETAILED DESCRIPTION OF THE INVENTION

The detergent compositions of this invention are comprised of (1) an organic surface active agent (surfactant, i.e., detergent compound); (2) a water-soluble cationic polymer selected from the group consisting of polyethylenimine and alkoxylated polyethylenimine having a molecular weight within the range from about 2,000 to about 3,000,000 and (3) a water-insoluble or sparingly soluble particulate substance capable of imparting a desired residual property to a surface to which it becomes affixed.

In its process aspect, this invention is a method for enhancing the deposition and retention of particulate substances upon surfaces washed with a detergent composition containing same, comprising uniformly admixing said particulate substances with a polyethylenimine or alkoxylated polyethylenimine polymer having a molecular weight within the range from about 2,000 to about 3,000,000, and having a cationic charge density greater than .001 in aqueous solution, and incorporating said mixture in a detergent base.

The “cationic charge density” of a polymer as that term is used herein refers to the ratio of the number of positive charges on a monomeric unit of which the polymer is comprised to the molecular weight of said monomeric unit, i.e.,

..., , ., number of positive charges cationic charge density=---------:----b----,---,--monomeric unit molecular weight

The cationic charge density multiplied by the polymer molecular weight determines the number of positively charged active sites on a given polymer chain.

Organic surfactants which can be used in the compositions of this invention are anionic, ampholytic, polar, nonionic, nonionic, zwitterionic or cationic. The surfactant can comprise from about 2% to about 95% by weight of the total composition. Anionic organic surffactants are generally preferred for the purposes of this invention. Suitable anionic surfactants include the water686 ⁴ .

operable amphoteric surfactants include the disodium salt of lauroyl-cycloimidinium-l-ethoxy-ethionic acid-2ethionic acid, dodecyl beta-alanine, and the inner salt of 2-trimethylamino lauric acid. As zwitterionics, the substituted betaines such as alkyl dimethyl ammonio acetates wherein the alkyl radical contains from about 12 to about 18 carbon atoms can also be used. Several examples of this class of zwitterionic surfactants are set forth in Canadian Patent 696,355, granted Oct. 20, 1964.

Especially preferred shampoo compositions in accordance with this invention will contain a non-soap anionic organic surfactant at a concentration of from about 8% to about 30% by weight of the total composition.

Although nonionic and cationic surfactants are not preferred for the purposes of this invention they can nevertheless be used without substantial loss of the advantageous effects of the cationic polymers on deposition and retention of particulate matter on washed surfaces. Nonionic surfactants may be described as compounds produced by the condensation of alkylene oxide groups (hydrophilic in nature) with an organic hydrophobic compound, which may be aliphatic or alkyl aromatic in nature. As those skilled in the art are well aware, the length of the hydrophilic or polyoxyaklylene radical required for condensation with any particular hydrophobic group can be readily adjusted to yield a water-soluble compound having the desired degree of balance between hydrophilic and hydrophobic elements.

For example, a well known class of nonionics is made available on the market under the trade name of “Pluaronic.” These compounds are formed by condensing ethylene oxide with a hydrophobic base formed by the condensation of propylene oxide with propylene glycol. The hydrophobic portion of the molecule, of course, exhibits water insolubility. The molecular weight of this portion is of the order of 950 to 4,000. The addition of polyoxyethylene radicals to this hydrophobic portion tends to increase the water solubility of the molecule as a whole. Liquid products are obtained up to the point where polyoxyethylene content is about 50% of the total weight of the condensation product.

Suitable nonionics also include the polyethylene oxide condensates of alkyl phenols, e.g., the condensation products of alkyl phenols having about 6 to 12 carbon atoms, either straight chain or branch chain, in the alkyl group with ethylene oxide in amounts equal to 10 to 25 moles of ethylene oxide per mole of alkyl phenol. The alkyl substituent in such compounds may be derived from polymerized propylene, diisobutylene, octane, or nonane, for example.

Other suitable nonionics may be derived by the condensation of ethylene oxide with the product resulting from the reaction of propylene oxide and ethylene diamine. Here again, a series of compounds may be produced, depending on the desired balance between hydrophobic and hydrophilic elements. For example, compounds (molecular weight from about 5,000 to about 11,000) of about 40% to 80% polyoxyethylene content and resulting from the reaction of ethylene oxide groups . with a hydrophobic base constituted of the reaction product of ethylene diamine and excess propylene oxide, said base having a molecular weight of the order of 2,500 to 3,000, are satisfactory.

Further satisfactory nonionics include the condensation product of aliphatic alcohols having from 8 to 18 carbon ⁰ atoms, either straight chain or branch chain, with ethylene oxide, an example being a coconut alcohol/ethylene oxide condensate having from 10 to 30 moles of ethylene oxide per mole of coconut alcohol, the coconut alcohol γθ fraction having from 10 to 14 carbon atoms.

Cationic surfactants which can be used in the compositions of this invention include distearyl dimethyl ammonium chloride, stearyl dimethyl benzyl ammonium chloride, coconut alkyl dimethyl benzyl ammonium chlor75 ide, dicoconut alkyl dimethyl ammonium chloride, cetyl

3,489, soluble salts of organic sulfuric reaction products having in their molecular structure an alkyl group containing from about 8 to about 20 carbon atoms and a sulfonic acid or sulfuric acid ester radical. Such surfactants include the sodium, potassium, and trienthanolamine alkyl sulfates, especially those derived by sulfation of higher alcohols produced by reduction of tallow or coconut oil glycerides; sodium or potassium alkyl benzene sulfonates, especially those of the types described by Gunther et al. in U.S. Patent 2,477,383, granted July 26, 1949, in which ₁₀the alkyl group contains from about 9 to about 15 carbon atoms; sodium alkyl glyceryl ether sulfonates, especially those ethers of higher alcohols obtained from tallow and coconut oil; sodium coconut oil fatty acid monoglyceride sulfates and sulfonates; sodium salts of sulfuric acid jg esters of the reaction product of one mole of a higher alcohol (i.e., tallow or coconut oil alcohols) and about 3 moles of ethylene oxide; and the water-soluble salts of condensation products of fatty acids with sarcosine, e.g., triethanolamine N-acyl sarcosinate, the acyl radicals 20 being derived from coconut oil fatty acids.

Preferably, anionic organic surfactants of the high sudsing type are used for the shampoo embodiments of this invention. Thus, alkyl glyceryl ether sulfonates, N-acyl sarcosinates, and alkyl ether ethylene oxide sul- 25 fates as described above are used to special advantage. These and the foregoing surfactants can be used in the form of their sodium, potassium or lower alkanolamine (e.g., mono-, di-, and triethanolamine) salts.

Conventional soaps are also operable anionic surfac- 30 tants for the purposes of this invention. Suitable soaps include the water-soluble salts, e.g., sodium, potassium, and lower alkanolamine salts of fatty acids occurring in coconut oil, soybean oil, castor oil or tallow, or synthetically produced fatty acids may be used. 35

Polar nonionic surfactants can be used herein, either alone or in admixture with anionic and/or ampholytic surfactants. Surfactants of this class can serve to enhance lathering and cleaning properties of anionic detergents. By “polar nonionic surfactant” is meant a surfactant in 40 which the hydrophilic group contains a semi-polar bond directly between two atoms, e.g., N->0, P-»O, As->O, and S—>O. (The arrow is the conventional representation of a semi-polar bond.) There is charge separation between the two directly bonded atoms, but the surfactant molecule bears no net charge and does not dissociate into ions.

A preferred polar nonionic surfactant for use in the present compositions is amine oxide of the general formula RiR₂R3N->O, wherein Ri is an alkyl, alkenyl, or monohydroxy alkyl radical having from about 10 to 16 carbon atoms, and R₂ and R_s are each methyl, ethyl, propyl, ethanol or propanol radials. An especially preferred amine oxide is dodecyldimethylamine oxide.

Other operable polar nonionic surfactants are the phosphine oxides having the general formula RjRaRgP-^O, wherein Ri is an alkyl, alkenyl or monohydroxyalkyl radical ranging in chain length from 10 to 18 carbon atoms, and R₂ and R₃ are each alkyl or monohydroxyalkyl radicals containing from 1 to 3 carbon atoms. A preferred phosphine oxide is dodecyldimethyl phosphine oxide.

Suitable amphoteric surfactants include the alkyl betaiminodipropionates, RN(C₂H₄COOM)₂, alkyl beta-aminoproprionates, RN(H)C₂H₄COOM; and long chain imidazole derivatives having the general formula:

CHj ''cii II I R—C---N— CH2CH2O CH2C OOM

Oil ^CHjCOOM

In each of the above formulae, R is an acyclic hydrophobic group containing from about 8 to about 18 carbon atoms and M is a cation to neutralize the charge of the anion, e.g., alkali metal such as sodium and potassium and ammonium and substituted ammonium cations. Specific

3,489,686 pyridinium chloride, and cetyl trimethyl ammonium bromide.

As hereinbefore indicated, the compositions of this invention contain as an essential component a watersoluble cationic polyethylenimine or alkoxylated polyethylenimine polymer having a molecular weight within ⁵the range from about 2,000 to about 3,000,000 and a cationic charge density greater than .001 in aqueous solution.

It is believed that the structural formula of the backbone of polyethylenimine is:

N--CH₂C H₂N--C Hi C H2NH2 h₂c wherein x represents a whole number of sufficient magnitude to yield a polymer of molecular weight greater than about 2,000. Branch chains occur along the polymeric backbone and the relative proportions of primary, secondary and tertiary amino groups present in the polymer will vary, depending on the manner of preparation. The distribution of amino groups in a typical polyethylenimine is approximately as follows:

—ca-cil>-NH:

—CH2—CH2—NH— —CH₂—CH2—N—

30%

40%

30%

The polyethylenimine is characterized herein in terms of molecular weight. Such polymers can be prepared, for example, by polymerizing ethylenimine in the presence of a catalyst such as carbon dioxide, sodium bisulfite, sulfuric acid, hydrogen peroxide, hydrochloric acid, acetic acid, etc. Specific methods are described in U.S. Patent Nos. 2,182,306, Ulrich et al., granted Dec. 5, 1939; 3,033,746, Mayle et al., granted May 8, 1962; 2,208,095, Esselmann et al., granted July 16, 1940; 2,806,839, Crowther, granted Sept. 17, 1957; and 2,553,696, Wilson, granted May 21, 1951. Polyethylenimine has a cationic charge density of .004 in aqueous solution at pH 7.0.

Similarly, alkoxylated polyethylenimine can be prepared, for example, by reacting one part by weight ethylene oxide or propylene oxide with one part by weight of polyethylenimine prepared as described above and having a molecular weight greater than about 2,000. Preferably, the weight ratio of polyethylenimine to alkylene oxide is at least about 1:1. If this ratio is less than about 1:4 the cationic charge density of the polymer in aqueous solution will not be greater than .001 as is required for the purpose of this invention. Thus, the ratio of polyethylenimine to alkylene oxide must be equal to or greater than about 1:4. A preferred ethoxylated polyethylenimine has a molecular weight of about 80,000 to 120,000¹ and a cationic charge density of .004 in aqueous solution at pH 7.0.

The cationic polymer can be employed herein at a concentration within the range from about 0.1% to about 10.0% by weight, preferably from about 0.25% to about 4.0% by weight.

Particulate substances which can be used in the detergent compositions of this invention preferably have an average particle diameter within the range from about 0.2 to about 50 microns and include water-insoluble or sparingly soluble anti-microbial agents, sunscreens, fabric brighteners, and various substances which create a favorable skin feel after washing. These particulate substances depend on deposition and retention on washed surfaces to produce their intended effect.

Particulate antimicrobial substances, the deposition and retention of w'hich is enhanced by the cationic polymers described herein include, for example, (a) substituted salicylanilidies having the general formula:

<img file="US3489686A_D0001.tif" />

wherein X is hydrogen or halogen, and Y is hydrogen, halogen or trifluoromethyl; (b) substituted carbanilides having the general structural formula:

<img file="US3489686A_D0002.tif" />

wherein Y is hydrogen, halogen, or trifluoromethyl, Xi is halogen or ethoxy, X₂ is hydrogen or halogen; (c) substituted bisphenols having the general structural formula:

OH OH

<img file="US3489686A_D0003.tif" />

wherein X is halogen and n is an integere from 1 to 3, R is an alkylene radical having from 1 to 4 carbon atoms or divalent sulfur; and (d) mixtures of (a), (b), and (c).

The salicylanilides encompassed by (a) above include 3,4',5-tribromosalicylanilide; 5 - bromosalicyl-3,5-di(trifluoromethyl)anilide; 5-chlorosalicyl - 3,5 - di(trifluoromethyl)anilide; 3,5-dichlorosalicyl-3,4 - dichloroanilide; and 5-chlorosalicyl-3-trifluoromethyl - 4 - chloranilide. These and other salicylanilides useful herein are disclosed by Bindler and Model in U.S. Patent 2,703,332, granted Mar. 1, 1955.

The preferred cabanilides of (b) above include 3,4,4'trichlorocarbanilide; 3-trifluoromethyl - 4,4' - dichlorocarbanilide; 3-trifluoromethyl-3 ',4,4'-trichlorocarbanilide; 3,3'-bis (trifluoromethyl)-4-ethoxy - 4'-chlorocarbanilide; and 3,5-bis (trifluoromethyl) -4-chlorocarbanilide.

The compounds in (c) above in which R represents an alkylene radical are more fully described in U.S. Letters Patent 2,555,077, granted Dec. 26, 1950. The preferred compounds of the general class of (c) above are those which are symmetrical in structural configuration, such as bis (5-chloro-2-hydroxyphenyl) methane, bis (3,5-dichloro2-hydroxyphenyl) methane, bis(3,5,6-trichloro-2-hydroxyphenyl)methane, bis(3,5-dichloro - 2 - hydroxyphenyl)sulfide, &gt;bis(3,5,6-trichloro-2-hydroxyphenyl)sulfide, and mixtures thereof.

Additional antimicrobial compounds suitable for use in this invention are N-trichloromethylmercapto-4-cyclohexene-l,2-dicarboximide and N-(l,1,2,2,-tetrachloroethylsulfenyl)-cis-Δ - 4 - cyclohexene-1,2-dicarboximide.

Preferred antibacterial agents employed herein are salts of 2-pyridinethiol-l-oxide which has the following structural formula in tautomeric form, the sulfur being attached to the number 2 position of the pyridine ring:

O OH

T I

<img file="US3489686A_D0004.tif" />

2-pyridinethiol-loxide l-hydroxy-2-pyridinethione

Heavy metal salts of the above compounds are sparingly soluble and have a high degree of antibacterial activity. Preferred salts include zinc, cadmium, tin and zirconium 2-pyridinethiol-l-oxide.

Combinations of the above-described antibacterial substances can also be used to advantage. Such combinations are illustrated in U.S. Patent 3,281,366, granted Oct. 25, 1966.

These antimicrobial compounds are used in particulate form, with average particle sizes ranging from about 0.2 to about 30 microns. The quantity of antimicrobial agent employed can range from about 0.1% to about 10% and preferably from about 0.5% to about 2.0% by weight.

Preferred antimicrobial detergent compositions in accordance with this invention especially adapted to washing hair and scalp are comprised of from about 10% to

3,489,686 about 35% by weight of at least one non-soap anionic, polar nonionic, ampholytic or zwitterionic surfactant; from about 0.25% to about 2.0% by weight of a polyethylenimine or alkoxylated polyethylenimine polymer having a cationic charge density greater than about .001 _ and having an average molecular weight within the range from about 30,000 to about 1,000,000; from about 0.5% to about 2.0% by weight of a water-soluble or sparingly soluble antimicrobial substance in particulate form; and the balance substantially water.

Detergent compositions in accordance with this invention can be prepared by methods well known in the art; however, as hereinbefore indicated, it has been found that especially good results are obtained when the cationic polymer and particulate substances are uniformly ad- 15 mixed in an initial step, with the mixture then being added to an aqueous solution or slurry of the surfactant. If the polymeric component and particulate substance are added to the surfactant separately, the degree of deposition and retention enhancement effected by the polymer 20 will be somewhat less.

Each of the aforementioned components can be incorporated in an aqueous vehicle which may, in addition, include such materials as organic solvents, such as ethanol; thickeners, such as carboxymethylcellulose, magnesium- 25 aluminum silicate, hydroxyethylcellulose or methylcellulose; perfumes; sequestering agents, such as tetrasodium ethylenediaminetetraacetate; and opacifiers, such as zinc stearate or magnesium stearate, which are useful in enhancing the appearance or cosmetic properties of the 30 product.

Coconut acyl mono- or diethanol amides as suds boosters, and strongly ionizing salts such as sodium chloride and sodium sulfate may be used to advantage.

Toilet detergent or soap bars containing a cationic 35 polymer and particulate substance according to this invention can be based on soap or non-soap synthetic detergents and can also contain a variety of adjuvants to improve product performance or appearance. Examples of such adjuvants include free fatty acids or cold cream to 40 improve cosmetic properties, perfumes, inorganic salts to improve bar firmness, insoluble soap to improve bar texture, coloring matter and the like.

In the case of heavy-duty laundering detergents containing the cationic polymers and particulate substances in accordance with this invention, such detergents can 45 be in granular, flake, liquid or tablet form and can contain, in addition to detergent and inorganic or organic builder compounds (such as those disclosed by Diehl in U.S. Patent 3,159,581, granted Dec. 1, 1964), minor amounts of adjuvant materials which make the product 50 more effective or more attractive. The following are mentioned by way of example. A tarnish inhibitor such as benzotriazole or ethylenethiourea may also be added in amounts up to about 2%. Fluorescers, perfume and color while not essential in the compositions of the invention, 55 can be added in amounts up to about 1%. An alkaline material or alkali, such as sodium hydroxide or potassium hydroxide, can be added in minor amounts as supplementary pH adjusters when needed. There can also be mentioned as suitable additives, brightening agents, so- 60 dium sulfate, and sodium carbonate.

Corrosion inhibitors generally are also added. Soluble silicates are highly effective inhibitors and can be added to certain formulas of this invention at levels of from about 3% to about 8%. Alkali metal, preferably potas- 65 sium or sodium, silicates having a weight ratio of

SiO₂:M₂O of from 1.0:1 to 2.8:1 can advantageously be used. M in this ratio refers to sodium or potassium. A sodium silicate 70 having a ratio of SiC^NajO of about 1.6:1 to 2.45:1 is especially preferred for economy and effectiveness.

In the embodiment of this invention which provides for a built liquid detergent, a hydrotropic agent at times is found desirable. Suitable hydrotropes are water-soluble 75 alkali metal salts of toluenesulfonate, benzenesulfonate, and xylenesulfonate. The preferred hydrotropes are the potassium or sodium toluenesulfonates. The hydrotrope salt can be added, if desired, at levels of 1% to about 12%. While a hydrotrope will not ordinarily be found necessary, it can be added if so desired, for any reason including the preparation of a product which retains its homogeneity at a low temperature.

The term “coconut alkyl” as used herein and in the following examples refers to alkyl groups which are derived from the middle cut of coconut alcohol having the following approximate chain length distribution: 2% C_l0, 66% C₁₂, 23% C14, and 9%, C_i6. Other compounds designated as coconut oil derived are based on unfractionated coconut oil or its fatty acids.

The following examples are illustrative of several detergent compositions of this invention.

EXAMPLE I

A shampoo composition was prepared having the following composition:

Parts by wt.

Sodium coconut alkyl glyceryl ether sulfonate (about 23% diglyceryl and the balance substantially monoglyceryl) _______________________25.0

Sodium tallow alkyl glyceryl ether sulfonate (about 23% diglyceryl and the balance substantially monoglyceryl; the tallow alkyls correspond to those of substantially saturated tallow alcohols and contain approximately 2% C₁₄, 32%Ci₆ and 66% C₁₈) ________________________________ 3.0

Sodium chloride 6.7

Sodium sulfate 3.3

Sodium N-lauroyl sarcosinate 3.8

N-coconut acyl sarcosine 1.2

Diethanolamide of coconut fatty acids 2.0

Acetylated lanolin 1.0

Perfume 0.4

Color 0.04

Zinc 2-pyridinethiol-l-oxide¹ 2.0

Polyethylenimine/ethylene oxide reaction product weight ratio 1:1, molecular weight 80,000-120,000 and cationic charge density of .004 in aqueous solution at pH 7.0_________________________ 0.5

Water __________________________________ Balance ¹ Average particle size 2 microns.

The zinc pyridinethione and ethoxylated polyethylenimine were uniformly admixed and added to and uniformly mixed with the balance of the components. The resulting product was a stable cream having excellent cosmetic and antidandruff properties. The degree of deposition of zinc pyridinethione from this composition was much greater than the degree of deposition attained with a similarly formulated product which contained no cationic polymer. Residual antimicrobial activity of surfaces washed with this composition is markedly greater as compared to surfaces washed with a control product without polymer.

Compositions identical to the composition of Example I, but containing 5 micron diameter particles of 3,4,4'-trichlorocarbanilide; 3,4',5-tribromosalicylanilide; 4,4'-dichloro - 3 - (trifluoromethyl)carbanilide; bis(2-hydroxy3,5,6-trichlorophenyl)methane, and 6.5 micron particles of N-trichloromethylmercapto-4-cyclohexene-l,2 - dicarboximide and N-( 1,1,2,2-tetrachloroethylsulfenyl)-cis-A4-cyclohexene-l,2-dicarboximide, respectively, in place of zinc 2-pyridinethiol-l-oxide are prepared and compared with control compositions containing these same compounds without cationic polymer. The degree of deposition and retention of these compounds in the presence of the cationic polymer is found to be substantially greater than is attached with the control compositions, and a corresponding increase in residual antimicrobial activity is observed on surfaces washed therewith.

3,489,686

EXAMPLE II

Another antimicrobial detergent formulation in accordance with this invention is formulated as follows:

Parts by wt. Triethanolamine coconut alkyl sulfate________10.0

Coconut alkyl dimethyl amine oxide 10.0

Monoethanol amide of coconut fatty acids____5.0

Ethanol 10.0

Polyethylenimine ¹ 0.75

Cadmium 2-pyridinethiol-1 -oxide (average particle size 3.0 microns) 0.25

Water, NaOH to adjust to pH 8.5____________Balance * A water-soluble cationic polymer having a molecular weight of 50,000 to 100,000, a cationic charge density of .004 in aqueous solution at pH 7.0, and a viscosity of 2.5 centipoise (absolute viscosity) in a 1% by weight aqueous solution measured with an Ostwald viscosimeter at 100° F.

This composition has excellent antimicrobial properties and in usage imparts sustained antimcrobial activity to surfaces washed therewith. The amine oxide can be replaced, in whole or in part, with coconut beta-iminodipropionate, disodium; lauroylcycloimidinium-l-ethoxy ethionic acid-2-ethionic acid, disodium; or dodecyl ammonioacetate, with substantially equivalent results.

Further compositions in accordance with this invention are as follows.

EXAMPLE III

A liquid detergent composition suitable for use as an antidandruff shampoo is formulated as follows:

Parts by wt.

Triethanolamine coconut alkyl sulfate 20.0

Monoethanol amide of coconut fatty acid______4.5

Magnesium aluminum silicate 0.9

Methylcellulose 0.23

Dye 0.008

Perfume 0.8

Zinc 2-pyridinethiol-l-oxide ¹ 1.0

Polyethylenimine/ethylene oxide reaction product (weight ratio 4:1; molecular weight 50,000; cationic charge density .004 in aqueous solution at pH 7.0)_________________________ 0.5

Water -----------------------------------Balance ¹ Average particle size 1.5 microns.

This composition provides a substantial degree of antidandruff effect when used in the customary fashion. The degree of deposition and retention of particulate zinc pyridine thione on the hair and scalp after shampooing with this product is substantially greater than is attained with a similar composition without the polyethylenimine/ ethylene oxide reaction product.

¹⁰

Each of the above compositions impart a residual antimicrobial activity to surfaces washed therein which is substantially greater than is attainable with similar compositions without the polymeric component.

In Example XI, distearyl dimethyl ammonium chloride, ^δ stearyl dimethyl benzyl ammonium chloride, or dicoconut alkyl dimethyl ammonium chloride can be used in place or sodium dodecyl benzene sulfonate without loss of the improved deposition and retention of zirconium 2-pyridinethiol-l-oxide particles effected by the polyethylenimine.

In Example IV, sodium coconut alkyl (ethoxy )₃ sulfate can be replaced with the condensation product of ethylene oxide with a hydrophobic base formed by the con25 densation of propylene oxide with propylene glycol and having a molecular weight of 1600 or the condensation product of octyl phenol and ethylene oxide using a mole ratio of 1:15, with substantially equivalent results.

The enhanced deposition and retention of pyridinethi20 one salts was demonstrated as follows: A control composition was formulated as in Example I, but omitting the polyethylenimine/ethylene oxide reaction product. A composition similar in formulation but containing 0.5% of polyethylenimine having a cationic charge density of 25 .004 in aqueous solution at pH 7.0 and a molecular weight of 50,000 was prepared and designated test composition A. A test composition designated B which differed from the control composition in containing 0.5% of the polyethylenimine of composition A and 1.0% of zinc 2-pyri30 dinethiol-l-oxide having an average particle size of 2 microns, rather than 2.0% of this latter component as in the control composition, was also prepared.

The hair of 16 female subjects was shampooed by experienced beauty shop operators who washed half of the 35 hair and scalp of each subject with the control composition. The other half of the subject’s hair and scalp was washed in the assigned test composition. The test and control composition were used ad libitum, in quantities sufficient to provide a good lather. After lathering for 45 40 seconds, the hair was rinsed and the compositions were reapplied, lathered for 45 seconds and rinsed again. The hair was then dried. A sample of cornified epithelium from both the control and test halves of each subject’s scalp was obtained by applying cellulose adhesive tape 45 against the scalp. The tape was then placed on a glass slide with the adhesive in contact with the glass. The slide was examined with a polarizing microscope at approximately 400 diameters with polaroids crossed. While the cornified epithelium exhibited some degree of bire50 fringence, the highly anisotropic properties of the particulate zinc 2-pyridinethiol-l-oxide made it readily visible under such viewing conditions. The relative quantity of particulate zinc 2-pyridinethiol-l-oxide was then graded

Examples

IV V VI VII VIII IX X XI

Sodium coconut alkyl (ethoxy)³ sulfate.. 20___________ 7.5

Sodium lauroyl sarcosinate.................... 25 5 10 _____________________

Sodium dodecyl benzene sulfonate.......... 10___________________ 25

2-trimethylamine lauric acid________________________ 5 5________ 25............

Triethanolamine coconut alkyl monoglyceride sulfonate____________________________________________ 7.5__________________

Potassium coconut soap___________________________________ 5 20

Ethanol......................................................... io. ό___________’ δ.Ο

Polyethylenimine i_____________________ 2.0 ...... 2.5______________ 0.5 1.0

Polyethylenimine/propylene oxide reaction product 2_______________________________ 1.5______ 2.5 0.5______ 2.0______

Tin 2-pyridine-thiol-l-oxide (average particle size 7 microns)________________ 1.0______ 0.5...... 2.0. 0.1.

Zirconium 2-pyridinethiol-l-oxide (average particle size 4 microns)........... 1.0______ 0.5........ 2.5 1.5

Water--------------------------------- Balance (Molecular weight 10,000; cationic charge density .004 in aqueous solution at pH 7.0.) (Weight ratio 2:1; molecular weight 30,000; cationic charge density greater than .001 in aqueous solution at pH 7.0.)

3,489,686 on a 0 to 4 scale, with a grade of 4 indicating heavy deposition, and 0 indicating substantially no deposition.

The following results were obtained.

TABLE 1

Composition: Average degree of deposition

Control2.3

A3.4

B2.6

It can be seen from the above results that deposition and retention of zinc 2-pyridinethiol-l-oxide was substantially greater from a detergent composition which contained 0.5% of polyethylenimine as compared to the control composition which contained the same amount of zinc 2-pyridinethiol-l-oxide without polymer. Similarly, composition B which contained only 1.0% of zinc 2pyridinethiol-l-oxide yielded a somewhat higher degree of deposition and retention than the control composition which contained twice as much of this salt, but no polymer.

In like manner the relative deposition of zinc 2-pyridinethiol-l-oxide from a detergent composition containing various concentrations of ethoxylated polyethylenimine was demonstrated as follows: The following compositions were prepared.

TABLE 2

Parts by Weight

Composition Con- --------------trol C D E I'

Sodium coconut alkyl glyceryl ether sulfonate ¹______________________________

Sodium tallow alkyl glyceryl ether sulfonate_______________________________

Sodium chloride__________________________

Sodium sulfate___________________________

Sodium N-lauroyl sarcosinate_____________

N-coconut acyl sarcosinate________________

Coconut acyl diethanolamide_____________

Acetylated lanolin________________________

Perfume__________________________________

Color__________________________________

Zinc 2-pyridinethiol-l-oxide (average particle size 2 microns)_____________________

Polyethylenimine/ethylene oxide reaction product¹___________________________

Water_____________________________________

25.0

3.0

6.5

3.1

3.8

1.2

2.0

1.0

0.4

0.04

2.0

25.0 25.0 25.9

3.0

6.5

3.5

3.8

1.2

2.0

1.0

0.4

0.04

3.0

6.5

3.1

3.8

1.2

2.0

1.0

0.4

0.04

3.0

6.5

3.1

3.8

1.2

2.0

1.0

0.4

0.04

1.0 0.5 1.0

1.0 1.0 2.0

Balance i Same as Example I.

Each of the compositions was tested in the manner described supra, using a test composition and control composition on each of the test subjects. The results attained were as follows:

Average degree of deposition

Composition C (8 subjects)____________________3.3

Control (same 8 subjects)____________________3.0

Composition D (8 subjects)____________________ 1.9

Control (same 8 subjects) ___________________2.4

Composition E (4 subjects)_____________________4.0

Control (same 4 subjects)____________________3.3

Composition F (8 subjects)_____________________3.4

Control (same 8 subjects) ___________________3.3

It can be seen that the degree of deposition attained with composition C containing only half as much zinc 2pyridinethiol-l-oxide as the control was yet greater than the control. Composition D, which contains 1.0% polymer and only Ui as much zinc 2-pyridinethiol-l-oxide as the control, displayed only moderately less deposition than the control. Composition E, which contains 2% polymer and only half as much zinc 2-pyridinethiol-l-oxide as the control, provides somewhat greater deposition than the control. Composition F, containing 2.0% polymer and only % as much zinc 2-pyridinethiol-l-oxide as the control, provides a degree of deposition approximately equal to the control.

EXAMPLE XII

An antimicrobial milled toilet detergent bar which also constitutes a preferred embodiment of this invention is prepared in accordance with methods well known in the art and having the following composition:

Parts by wt.

Sodium alkyl glyceryl ether sulfonate ¹ 8.0 _r Potassium alkyl sulfate ¹ 20.0 ⁰ Magnesium soap of 80:20 tallow: coconut fatty acids 16.7

Sodium soap of 89:20 tallow: coconut fatty acids32.4

Inorganic salts (sodium and potassium chlorides and

IO sulfates) 9.2

3,4',5-tribromosalicylanilide (average particle size microns) 1.0

Polyethylenimine² 2.0

Water and miscellaneous 10.7 ¹ Alkyl groups derived from middle cut of alcohols obtained by catalytic reduction of coconut alcohol which has a chain length distribution substantially as follows: 2% Cio, 66% C12, 23% Cm, and 9% Cm.

² Molecular weight 50,000—cationic charge density .004 in aqueous solution at pH 7.0.

²θ The deposition and retention of the particulate antimicrobial agent 3,4',5-tribromosalicylanilide upon skin washed with the above composition is substantially greater than occurs with a control composition without 25 cationic polymer.

Toilet detergent bars identical in composition to the bar described above are prepared, replacing the 3,4',5tribromosalicylanilide with 4 micron particles of the antimicrobial agents 3,4,4' - trichlorocarbanilide; 4,4'3θ dichloro - 3 - (trifluoromethyl)carbanilide; bis(2-hydroxy3,5,6 - trichlorophenyl)methane; and a 1:1 mixture of 4,4' - dichloro - 3 - (trifluoromethyl)carbanilide and 3, 4',5 - tribromosalicylanilide, respectively, with improved deposition and retention of the antimicrobial particles 35 being attained in each case relative to control compositions without polyethylenimine.

EXAMPLE XIII

An antimicrobial granular built laundry detergent ⁴⁰ product is prepared by conventional means, having the following composition:

Parts by wt.

Sodium alkyl benzene sulfonate (the alkyl group averaging about 12 carbon atoms and being de45 rived from polypropylene) 17.5

Sodium tripolyphosphate 49.7

Sodium sulfate 13.3

Silicate solids 7.0

3,4,4'-trichlorocarbanilide (particle size averaging

3 microns) 0.5

Polyethylenimine Vethylene oxide reaction product (weight ratio 4:1; molecular weight 50,000; cationic charge density .004 in aqueous solution at pH 7.0)________________________________ 1.5 i gee Footnote 2, Example XII.

Each of the foregoing examples describe embodiments of this invention which involve antimicrobial particulate substances. As hereinbefore disclosed, the deposition and 60 retention of other particulate substances are also enhanced by the cationic polymers. The following examples are illustrative of detergent compositions in accordance with this invention containing representative particulate substances which function through deposition and reten65 tion on washed surfaces.

Toilet detergent bars desirably contain a sunscreen or ultraviolet absorber which will deposit on the skin in the course of washing therewith to provide protection against harmful sun rays. Suitable particulate ultraviolet 70 absorbers which can be incorporated in detergent bars for this purpose include, for example, 2-hydroxy-4-noctoxybenzophenone, 2 - hydroxy - 4 - methoxy - 2-carboxybenzophenone, and 2 - hydroxy - 4 - methoxybenzophenone. These materials are insoluble particulate solids 75 which are employed in bar soap formulations in con3,489,686 centrations ranging from about 1% to about 5% by weight.

EXAMPLE XIV

A toilet soap bar containing an ultraviolet absorber is formulated in accordance with this invention as follows: 5 Percent by wt.

Sodium soap of 50:50 talow:coconut fatty acids73.19

Coconut fatty acid 7.30

Cold cream 1.10

Inorganic salts (sodium chloride and sulfate and 10 silicate solids) 0.87

Perfume 1.23

2-hydroxy-4-n-octoxybenzophenone (particle size microns) 2.50

Cationic polymer¹ _________________________ 3.00

Miscellaneous 0.81

Water 10.00 ¹ Same as Example III.

When used in the customary fashion, the toilet soap 20 bar of this example effects a substantially greater degree of deposition and retention of the particulate ultraviolet absorber (2-hydroxy-4-n-octoxybenzophenone) on the washed skin surfaces than does an identical composition without polymer. 25

Additional toilet soap bars are prepared as above but containing 2-hydroxy-4-methoxy-2'-carboxybenzophenone and 2 - hydroxy - 4 - methoxybenzophenone, respectively, in place of 2-hydroxy-4-n-octoxybenzophenone, with substantially equivalent results. 30

Other insoluble particulate substances which are desirably incorporated in toilet soap or detergent bars include the so-called “skin feel enhancers.” Such materials are deposited as particles on the skin in the course of washing and create a favorable skin “feel” after 35 washing. Such materials include, for example, nicotinic acid, talc and silicones, such as Dow-Corning silicone F-157. These materials are desirably incorporated in a toilet bar formula at levels of about 10% by weight.

EXAMPLE XV ⁴⁰

A bar soap formulation as set forth in Example XIV is prepared substituting 10.2% by weight of nicotinic acid particles (average particle size 5 microns) for the 2hydroxy - 4 - n - octoxybenzophenone and coconut fatty acid. The resulting composition yields a substantially 45 greater degree of deposition and retention of nicotinic acid particles on skin washed with the bar than is attained with a bar similarly formulated but without cationic polymer. Similar results are obtained when Dow-Corning silicone F-157 is used in place of nicotinic acid. 50

Various insoluble fabric Whiteners or brighteners, such as fluorescent dyes and bluings, e.g., ultramarine blue, deposit as particles on fabrics washed with laundry detergent products containing same. Such materials can be used in heavy-duty laundry detergent products in con- 55 centrations up to about 1 % by weight.

EXAMPLE XVI

A built liquid detergent formulation containing a particulate bluing material and a cationic polymer in accord- ₆₀ance with this invention is formulated as follows:

Percent by wt. 3(N,N-dimethyl-N-coconutammonio)-2 - hydroxypropane-l-sulfonate 9.00

Tergitol 12-P-12 (condensation product of 1265 moles of ethylene oxide and one mole of dodecylphenol) 3.00

Tripotassium methylene diphosphonate26.00

Sodium silicate (SiO₂:Na₂O=1.6:l) 3.00

Potassium toluenesulfonate___________________ 8.5070

Sodium carboxymethylhydroxyethylcellulose 0.30

Ultramarine blue (particle size 1.8 microns) 0.15

Cationic polymer ¹ 3.5

Water-----------------------------._______Balance ¹ Same as Example I.75

The above composition when used to launder white fabrics in the conventional method results in the deposition and retention of substantially greater quantities of the ultramarine blue particles on the washed fabrics than occurs when a product similarly formulated but without cationic polymer is used.

It will be obvious to those skilled in the art that the concept of this invention is applicable to a wide variety of insoluble or sparingly soluble particulate substances in addition to those specifically described in the foregoing specification. For example, perfumes which have been adsorbed on insoluble particulate resinous substances can be deposited on skin, fabrics and other surfaces washed with detergent compositions containing same to a substantially greater degree, through the inclusion in said compositions of a cationic polymer as herein defined.