Built detergent compositions containing diethyleneglycoliminodiacetic acid

56'~ ~1 lX90;~18 BUILT DETERGENT COMPOSITIONS CONTAINING POLYALKYLENEGLYCOLIMINODIACETIC ACID Michael P.

Siklosi FIELD OF THE INVENTION This inventlon pertains to detergent compositions which contain nonphosphorous detergency builders.

BACKGROUND OF THE INVENTION The use of detergency builders as adjuncts to organic water-soluble synthetic detergents and the property which these materials have of improving the overall detergency performance of such detergents are wel I known phenomena .

Polyphosphates have 20 been the most commonly used builders and within this class alkali metal , e.g ., sodium and potassium , polyphosphates and pyrophosphates have been most preferred.

An important function of builders in detergency is to sequester polyvalent metal ions (e.g., Ca2 and Mg2 ) in aqueous solutions of the detergent 25 composition.

In recent years public attention has been drawn to the role of phosphates generally in the life cycle of lakes, and specifically to the contribution by detergent phosphates to this process.

An imbalance of nutrients, e. g ., carbon, nitrogen, phosphates and 30 the like in lakes appears to adversely affect the ecological balance between algae and fish.

The consequence is that an ordinary and natural lake-aging process can be accelerated.

Accordingly, there has been considerable effort in recent years directed to the discovery of nonphosphorous materials which would act as effec35 tive builders and thus make it possible to formulate highly effec tive detergent compositions in which phosphorous-containing 1290~18 builders are wholly or partially replaced by nonphosphorouscontaining builders.

Because of the human exposure involved in the use of detergent products, it is essential that the ingredients used 5 therein be satisfactory from the standpoint of toxicological safety.

Thus, a detergent builder material must be safe, as well as effective.

The compound 2-hydroxyethyl-N,N-diacetic acid (HEIDA) has been disclosed in the literature as an effective nonphosphorous 10 detergency builder.

See West German Patent Applicatlon DT 2314449 to Mooch Domsjo AB, published March 27, 1972, and Environmental Protection Agency Publication EPA-600/2-74-003 by Schwartz et al., pages 36-38, published March 1974.

The EPA reference reports that HEIDA is "borderline with regard to both 15 oral and dermal toxicity . . ." The compound N-(dioxyethylene)-N,N-diacetic acid, also known as N-diethyleneglycol-N,N-diacetic acid, is disclosed, along with HEIDA in Japanese Laid Open Application 59/70652, published April 21, 1984.

The utility disclosed in this reference is the 20 synthesis of chelating resins in which the iminoacids are appended to a polymeric resinous material such as polystyrene.

The object of the present invention is to provide detergent compositions which contain a safe and effective nonphosphorous detergency builder.

SUAIII~ARY OF THE INVENTION The present invention relates to detergent compositions which comprise a synthetic detergent and polyalkyleneglycoldiacetic acid (or a water-soluble salt thereof) as a detergency 30 builder.

DETAILED DESCRIPTION OF THE INVENTION In accordance with the present invention it has been found that, e.g., N-diethyleneglycol-N,N-diacetic acid (DIDA) is 35 comparable to HEIDA in detergency builder performance, but is unexpectedly superior to HEIDA in toxicological safety and filmingJstreaking .

1290~18 -- 3 - The present invention comprises built detergent compositions which comprise from about 0.01% (preferably 0.19~) to about 95~ of a synthetic organic surfactant and from about 0.05% (preferably 0.5%) to about 95% of N-polyalkyleneglycol-N,N-diacetic acid or 5 the alkali metal and ammonium salts thereof.

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

The N-Polyalkyleneglycol-N,N-Diacetic Acid E~uilder The builder has the generic formula:

~ CH2aX~i H ~ O - R ~n N ~ CH2COONi wherein each R is selected from the group consisting of ethylene and propylene, preferably ethylene, n is a number from 2 to about 8, preferably from 2 to about 5; more preferably from 2 to about 3, and each M is either H or a salt-forming cation, preferably Na, K, NH4( ), or substituted ammonium cations containing from 1 to 4 short chain alkyl or hydroxy alkyl groups each of which contains from 1 to about 3 carbon atoms.

The builders are belleved to provide superior safety and/or filming/streaking .

The preferred builder is N-diethyleneglycol-N,N-diacetic acid and its salts as set forth hereinafter.

N-Diethyleneglycol-N,N-Diacetic Acid (DIDA) The compound N-diethyleneglycol-N,N-diacetic acid (DIDA) has the following structure:

~CH2COOH HO - C H O - C2H4 - N CH2CDOH ~Z90'~8 -- 4 - DIDA is a known compound.

It can be prepared by the reaction of two moles of sodium chloroacetate and one mole of 2-(2-aminoethoxy)ethanol in aqueous medium with two mole equivalents of base to neutrali~e the hydrochloric acld formed in the 5 reaction.

The base can be, for example, an alkali metal base (e.g., Na or K hydroxlde) or ammonium base (e.g., NaqOH).

This produces the dibasic salt of DIDA.

The salt can be reacted with strong acid (e.g., HCI) to form the diacid or monobasic salt.

Another method of preparatlon Is to react two moles of 10 ethylene oxide with one mole of Imlnodiacetic acid in ethanol at 100-180C and 10-100 atmospheres pressure in the presence of an alkalt metal hydroxide catalyst (See Japanese Application Sho.

59-70652, published April 21, 1984, The term DIDA will be used hereln to refer to both thè acid and salt forms of the compound unless otherwise indicated.

The Surfactant Compositions of thls invention contain organic surface-active 20 agents ( surfactants ) to provlde the usual cleanlng and emulsi fying benefits associated with the use of such materials.

Surfactants useful herein include well-known synthetic anionic, nonlonlc, amphoteric and zwitterionic surfactants.

Typical of these are the alkyl benzene sulfonates, alkyl- and 25 alkylether sulfates, paraffin sulfonates, olefin sulfonates, alkoxy lated (especially ethoxylated) alcohols and alkyl phenols, amine oxldes, alpha-sulfonates of fatty acids and of fatty acid esters, alkyl betalnes, fluorohydrocarbon surfactants (especlally anionic surfactants), and the like, which are well-known from the deter30 gency art.

In general, such detersive surfactants contain analkyl group In the Cg-ClB range.

The anionic deterslve surfac tants can be used in the form of their sodium, potassium or triethanolammonium salts; the nonionics generally contain from about 5 to about 17 ethylene oxide groups. C11-C16 alkyl ben35 zene sulfonates, C12-C18 paraffin-sulfonates and alkyl sulfates, and the ethoxylated alcohols and alky3 phenols are especially preferred In the compositions of the present type.

..~, ~'~ ~29();~18 The surfactant component can comprise as little as 0.1% of the compositions herein but typically the compositions wlll contain 1% to q0% more preferably 10~ to 30~, of surfactant.

A detalled llsting of suitable surfactants for the detergent compositions herein can be found In U.S.

Pat.

No. q 557 853 Collins Issued Dec. 10 1985 Commercial sources of such surfactants can be found in McCutcheon s EMULSIFIERS AND DETERGENTS North Amerlcan Edition 1984 McCutcheon Divlsion MC Publishing Company.

The composltlons of the present invention may be formulated into granules liqulds solid tablet or bar form.

Granular laundry detergent composltlons will generally contain from about 1% to about 40% preferably from about 5% to about 30%, and more preferably from about 10% to about 25% surfactant and generally from about 1% to about 40% preferably from about 5~ to about 30%, and most preferably from about 10% to about 30% of the detergency builder especlally DIDA.

DishwashTng llquids and heavy duty llquld laundry detergents generally contaln 1% to about 45% preferably about 5% to 40% and most preferably about 15% to about 35% surfactant and from about 1% to about 30%, preferably about 2% to about 25% and most preferably about 5% to about 15% of the detergency builder especially Dl DA .

Hard surface cleaner products will generally contaln from about 0.01% (preferably 0.1%) to about 15% preferably from about 0.25% to about 10% more preferably from about 1% to about 7% and most preferably from about 1% to about 5% surfactant and from about 0. 05% to about 10% preferably from about 0. 5% to 30 about 10% more preferably from about 2% to about 8% and most preferably from about 2% to about 6% of the detergency builder especially DIDA.

Optlonal Ingredlents The compositlons hereln can al50 contaln the various adjuncts whlch are known to the art for detergent compositions.

Nonlimiting examples of such adJuncts are:

~ ^ .

~290X18 Additional detergency builders such as polyphosphates (e.g., potassium pyrophosphate), nitrilotriacetates ~e.g., Na3NTA), sodium ethylenediaminetetraacetate, sodium ethylenetriaminepentaacetate, sodium citrate, sodium carbonate, sodium metasilicate and zeolites, e.g., zeolites having a cation exchange capacity (measured as CaCO3) of 200 mg or greater per gram of zeolite;

Enzymes such as proteases and amylases;

Bleaches such as sodium perborate, diperoxydodecanedioic acid, sodium dichloroisocyanurate and m-chloroperoxybenzoic acid;

Soil suspending agents such as sodium carboxymethyl cellulose;

81each activators for use with sodium perborate, such as tetraacetyl ethylene diamine and sodium nonanoyloxybenzene sulfonate;

Bleach stabilizers such as sodium diethylenetriamine-pentamethylenephosphonate and sodium diethylenetriaminipentaacetate;

Hydrotropes such as sodium toluene sulfonate, sodium cumene sulfonate and potassium xylene sulfonate;

Fabric softening ingredients such as smectite clay and ditallowdimethylammonium chloride;

Solvents such as pine oil, benzyl alcohol, butoxy propanol, Butyl CarbitolR and 1 (2-n-butoxy-1-methyl ethoxy)propane2-ol (also called butoxy propoxy propanol or dipropylene glycol monobutyl ether) and diols such as 2,2,4-trimethyl1, 3-pentanediol;

12902~8 Abraslves such as silica, pumice, calcium carbonate, polyvinylchloride and perlite;

Aesthetic-enhancing ingredients such as colorants and S perfumes.

Fillers such as sodium sulfate and water.

Sodium and potassium soaps, especîally coconut soaps, can be included, especially for creams.

Preferred Hard Surface Cleaner Compositions Particularly preferred compositlons of the present invention are compositions designed especial Iy for hard surface cleaning, wherein the builder, especially DIDA, and surfactant are used in combination with an organic solvent.

These compositions have exceptionally good cleaning properties.

They also have good "shine" properties, i.e., when used to clean glossy surfaces, without rinsing, they have much less tendency than phosphatebuilt products to leave a dull finish on the surface.

It is believed that this is due to the builder, especially DIDA, not crystallizing on the surface as the water/solvent evaporates.

Other builders such as polyphosphates crystallize on the surface and produce a dull appearance.

The solvents employed in the hard surface cleaning compositions herein can be any of the well-known "degreasing" solvents commonly used in, for example, the dry cleaning industry, in the hard surface cleaner industry and the metalworking industry.

Many such solvents comprise hydrocarbon or halogenated hydrocarbon moieties of the alkyl or cycloalkyl type, and have a boiling point well above room temperature, i.e., above about 20C.

The formulator of compositions of the present type will be guided in the selection of solvent partly by the need to provide good grease-cutting properties, and partly by aesthetic considerations.

For example, kerosene hydrocarbons function quite well in the present compositions, but can be malodorous.

Kerosene 1~90;~8 can be used in commercial situations.

For home use, where malodors would not be tolerated, the formulator would be more likely to select solvents which have a relatively pleasant odor, or odors which can be reasonably modified by perfuming.

The C6-Cg alkyl aromatic solvents, especially the C6-Cg alkyl benzenes, preferably octyl benzene, exhibit excellent grease removal properties and have a low, pleasant odor.

Likewise, the olefin solvents having a boiling point of at least about 100C, especially alpha-olefins, preferably 1-decene or l-dodecene, are excellent grease removal solvents.

Pine oil can also be used.

Polar solvents such as benzyl alcohol, isopropanol, n-hexanol, glycol ethers, e.g., butoxy propanol and 8utyl CarbitolR (diethyleneglycol monobutyl ether), or the phthalic acid esters can also be used in the practice of this invention.

Combinations of polar and nonpolar solvents can also be used.

Butoxy propanol and butoxy propoxy propanol are preferred solven~s.

Glycol ethers, e.g., butoxy propoxy propanol, butoxy propanol and/or hexyl carbitol in combination with the builder ~DIDA) provide improved oily soil and calcium soap detergency that can be even better than can be obtained by either alone.

Generically, the glycol ethers useful herein have the formula Rl O~R2O~mH wherein each Rl is an alkyl group which contains from about 4 to about 8 carbon atoms, each R is either ethylene or propylene, and m is a number from 1 to about 3.

The most preferred glycol ethers are selected from the group consisting of dipropyleneglycolmonobutyl ether, monopropyleneglycolmonobutyl ether, diethyleneglycolmonohexyl ether, monoethyleneglycolmonohexyl ether, and mixtures thereof.

A particularly preferred type of solvent for these hard surface cleaner compositions comprises diols having from 6 to about 16 carbon atoms in their molecular structure.

Preferred diol solvents have a solubility in water of from about 0.1 to about 20 9/lOO g of water a 20C.

Some examples of suitable diol soivents and their solubilities in water are shown in Table 1.

1290X18 TABLE 1 Solubility of Selected Diols in 20C Water Solubility Diol (9/1009 H20 1,4-Cyciohexanedimethanol 20.0* 2, 5-Dimethyl-2, S-hexanediol 14 . 3 2-Phenyl-1,2-propanediol 12.0* Phenyl-l, 2-ethanediol 12 . 0* ~-Ethyl-l ,3-hexanediol ~. 2 2, 2, 4-Trimethyl -1, 3-pentanediol 1 . 9 1,2-Octanediol 1.0 ~Determined via laboratory measurements.

All other values are from published literature.

The diol solvents are especially preferred because, in addition to good grease cutting ability, they impart to the compositions an enhancecl ability to remove calcium soap soils from surfaces such as bathtub and shower stall walls.

These soils are particularly difficult to remove, especially for compositions which do not contain an abrasive.

The diols containing ô-l 2 carbon atoms are preferred .

The most preferred diol solvent is 2, 2, 4trimethyl-l ,3-pentanediol.

The amount of solvent used in hard surface cleaner compositions herein is from about 1% to about 50%, preferably from about 1% to about 15%, more preferably from about 3% to about 11% of the composition, or from about 2% to about 10%.

The hard surface cleaner formulas can be in the form of granules or aciueous concentrates.

The invention will be illustrated by the following Examples.

EXAMPLE I ~ypical Synthesis of Sodium Diethylene~lycoliminodiacetic Acid (Na2 Salt) 237.7 gms (2.04 moles) of sodium chloroacetate is added to 100 ml of distilled water.

To this mixture, 105.0 gms (1.0 moles) 1;~9()~18 - 10 of 2-(2-aminoethoxy)ethanol dissolved in 100 ml distilled water is added slowly (5-10 minutes), with stirring.

The vessel containing the mixture is then immersed in a water/ice bath and 81.6 gms (2.04 moles) of sodium hydroxide dissolved in 250 gms dis5 tilled water is slowly added with stirring, keeping the tempera ture at 25 +1C.

The addition takes approximately 2 hours.

The reaction continues to be stirred at room temperature overnight (16 hours).

An aliquot is titrated with copper sulfate/murexide indicator (see titration procedure below) to check for complete10 ness of reaction.

An equal volume of methanol is added to thereaction mixture, the mixture is cooled and the precipitated sodium chloride is filtered.

The mixture is concentrated by means of a rotary evaporator to a thick slurry.

The methanol treatment is repeated twice more to eliminate the sodium chloride.

15 The final product is typically a 40-45% aqueous solution of DIDA (Na2 salt) and the overall yield is 80-85%.

If desired, the DIDA (Na2 salt) can be obtained in dry form by evaporation of the water.

The following titration method is used to determine % DIDA 2 0 in solution:

Approximately 0. 25 gm of sample ts weighed accurately and dissolved in 75 ml of distilled water.

Three drops of phenolthaleln indicator is added and the sample is titrated with 0 . 5N HCI to an endpoint (slightly pink). 10 mls of pH buffer and 1.0 25 gm of murexide indicator are added and the solution is titrated with 0.025 M copper sulfate solution to an endpoint. (Color at the endpoint goes from pink to purple to gray to green and gray is the endpoint).

The calculation for % DIDA (Na salt) is:

0 % DIDA (Na2 Salt) = mls CuSO,~ x Normality Cu~O,I x MW Na2 DIDA/10 wt. of sample 1290~18 EXAMPLE N A spray-dried granule of the present invention is prepared according to the following formula:

Ingredient Wt. % C11-C12 n-Alkyl Benzene Sulfonate (Na) 7 Hydrated Zeolite A (1-10 microns)25 DIDA (Na2) 6 SilTcate Solids 2.0 Sodium Sulphate 25 Sodium Perborate . 4H2O* 19 Tetraacetyl Ethylene Diamine* 1 . 0 Sodium Toluene Sulfonate 0.6 Protease Enzyme* 0 . S Na Carboxymethylcellulose 2 Brightener/ Perfume*lMinors 3 Moisture Balance *The composition of Example l l is prepared by conventional spray-drying procedures.

Ingredients indicated by an asterisk (~) are dry mixed into the spray-dried product to avoid decomposition.

Sodium perborate tetrahydrate in Example l l may be replaced by an equivalent amount of sodium perborate monohydrate or sodium percarbonate, as the bleaching ingredient.

~9~ 8 EXAMPLE l l I A spray-dried laundry detergent granule of the present invention is prepared according to the following formula:

I ng redient Wt .

Alpha-Sulfonated Coconut Fatty Acid 8 (methyl ester) C11-C13 n-Alkyl Benzene Sulfonate (Na~ 6 C13-C15 Alcohol Ethoxylate (EO 5-8) 12 Hydrated Zeolite A (1-10 microns) 20 DIDA (Na2) Silicate Solids 2.5 Sodium Sulphate 20 Sodium Perborate . 4H2O* 13 Tetraacetyl Ethylene Diamine* 1.0 Diethylene Triamine Penta Methylenephosphonate 0. 15 Sodium Toluene Sulfonate 0.6 Protease Enzyme* 0.5 Na Carboxymethylcellulose 2 BrightenerlPerfume*lMinors 3 MoisturelMiscellaneous Balance *The composition of Example l l l is prepared by conventional spray-drying procedures.

Ingredients indicated by an asterisk (*) are dry mixed into the spray-dried product to avoid decomposition.

EXAMPLE IV A liquid heavy duty laundry detergent is prepared according - - to the following formula:

'I 2~0~18 -- 13 - Ingredient Wt. % NaC12 alkyl lethoxy)3 sulfate 11.6 C12_13 alkyl (ethoxy)6 5 OH21.5 DIDA (Na2) 10.0 Ethanol 10 . 0 Brightenerlperfume/enzyme/minors 3.0 Water Balance to 100% This product has excellent laundry cleaning performance in 10 cool and warm water.

EXAMPLE Y A liquid hand dishwashing composition is prepared according 15 to the following formula:

Ingredient Wt. % Na C12 alkyl (ethoxy)3 sulfate 13 Na C12 alkyl (ethoxy)12 sulfate 14 C12 dimethylamine oxide DIDA (Na2) 5 Ethanol 1 0 Perfume and minors Water Balance to 100% EXAMPLE Vl A liquid hard surface cleaner composition of the present invention is prepared according to the following formula:

Ingredient Wt. % C11-C13 n-Alkyl Benzene Sulfonate (Na) 1.7 Na Cumene Sulfonate 3.0 2,2,4-Trimethyl-1,3-Pentanediol 6.0 DIDA (Na2) 3.0 Distilled H2O to 100 18 - 14 - The composition is prepared by simple mixing of the ingredients in the water.

The composition when dissolved in water at a dilution of 1:64 has excellent cleaning performance, particularly in the removal of 5 greasy kitchen soil from a no-wax floor tile.

The tile surface is left with a shiny appearance, even without rinsing.

The composition can also be used undiluted, for full strength cleaning.

In this context it is especially effective in removing calcium stearate soil (soap scum) from ceramic tile surfaces.

EXAMPLE Vll A I iquid hard surface cleaner composition is prepared according to the following formula:

Ingredient Wt. % Sodium C1 3-C1 5 Paraffin Sulfonate2 . S C12-C14 Fatty Alcohol (Ethoxy)3 0.6 1 (2-n-butoxy-1-methyl ethoxy) propane-2-ol 6 . 0 DIDA (Na2) 4.0 Sodium Cumene Sulfonate 2.0 Water and Minors up to 100 EXAMPLE Vl l l An abrasive-containing creamy scouring cleanser composition is prepared according to the following formula:

Ingredient Wt. % Sodium C13-C15 Paraffin Sulfonate 4.0 Sodium Coconut Fatty Acid Soap 2.0 DIDA (Na2) Sodium Carbonate 3 . 0 1(2-n-butoxy-1-methyl ethoxy) propane-2-ol 3 . 0 Benzyl Alcohol 1.3 Calcium Carbonate 30 . 0 Water and Minors up to 100 1290~8 EXAMPLE IX A hard surface cleaning composition especially adapted for spray-cleaning applications is prepared according to the following formula:

S Ingredient Wt. % Sodium C12 Linear Alkyl Benzene Sulfonate 1.00 n-Butoxy Propanol 7 . 00 DIDA (Na2) 1.25 Sodium Citrate 1.25 Sodium Carbonate 0.50 Sodium Cumene Sulfonate 1.00 Water and Minors 'Jp to 100 EXAMPLE X A hard surface cleaning composition especially adapted ~or spray-cleaning applications is prepared according to the following formula:

Ingredient Wt. % Sodium C12 Linear Alkyl Benzene Sulfonate 1.00 n-Butoxy Propanol 7. 00 DIDA tNa2) 2.50 Sodium Carbonate 0.50 Sodium Cumene Sulfonate 1.00 Water and Nlinors up to 100 EXAMPLE Xl A hard surface cleaning composition is prepared according to the following formula:

Ingredlent Wt. % Sodium C11 3 Linear Alkyl Benzene Sulfonate 2.5 Sodium C12 Alcohol ~EO)3 Sulfate 2.5 ---- DIDA (Na2) 3.0 1(2-n-butoxy-1-methyl ethoxy) propane-2-ol 6.5 Water and Minors - Perfume, Dye and Preservatives up to 100 pH adjusted to 10 . 5 1290~.8 -- 16 - EXAMPLE Xl I A hard surface cleaning composition is prepared according to the following formula:

Ingredient Wt. % Sodium C11 3 Linear Alkyl Benzene Sulfonate 2.5 Sodium C12 Alcohol ~EO)3 Sulfate 2.5 DIDA (Na2) 6.0 1 (2-n-butoxy-1-methyl ethoxy) propane-2-ol 7 . 0 Sodium Carbonate 2 . 0 Water and Minors - Perfume, Dye and Preservatives up to 100 pH adjusted to 10.5 EXAMPLE X l l l The following clear liquid cleaning formulas are made and tested for filming and streaking:

Formula No.* Ingredient 1 2 Wt. % Wt. % Sodium C1 1 3 Linear Alkyl Benzene Sulfonate 2.5 2.5 Sodium C12 Alkyl Polyethoxylate (EO)3 Sulfate 2.5 2.5 Coconut Fatty Acid 0.21 0.21 Dipropyleneglycolmonobutyl Ether 6 . 5 6 . 5 N-(2-Hydroxyethyl ) iminodiacetic Acid** 3 . 0 -Diethyleneglycoliminodiacetic Acid** -- 3.0 Formaldehyde 0. 01 0. 01 Color l~llix 0.4 0.4 Perfume 0 . 66 0. 66 Water up to 100 up to 100 *pH of all formulas = 10.5 **sodium salt form ~Z90~.8 -- 17 - Preparation of No-Wax Tiles The vinyl no-wax floor tiles used to test filming and streaking were prepared as follows:

Soiled Tiles - Four dark colored, high gloss, floor tiles are 5 washed first with a mild cleanser, followed by isopropyl alcohol, and finally with deionized water. A greasylparticulate kitchen soil (a mixture of 77.8% commercial vegetable oils and 22.8% particulate soil, composed of humus, sand, fine cement, clay, ferrous oxide, and carbon black) is used to soil the tiles. A small 10 amount of soil is spread evenly on a small paint roller (3" wide, 1/4" nap).

The soil is lightly rolled onto 4 tiles until a very light coating can be seen.

The panels are lightly buffed with a small cloth rag until a very llght haze is visible.

The following method is used to determine the amounts of 15 filming and streaking on floor tiles in a soiled and nonsoiled context:

Clean cut sponges (measuring approximately 3-1/2" x 1-1/2" x 3/4") are dipped in hot water for several minutes.

The sponges are maintained in 110F, 7 grain water.

Dilute solutions 20 of the test products are made by adding 1 part of the formula to 64 parts of 7 grain, 110F water.

Excess water in the sponge is wrung out and 10.0 grams of the dilute solution is dropped evenly onto one face of the sponge.

Each floor tile is divided into two 12" vertical by 6" horizontal sections.

The sponge is 25 wiped lightly and slowly over the floor surface by starting in the bottom left-hand corner of the section, wiping up, across, and down to the bottom right corner of the section.

The pattern is then retraced back to the original position.

This constitutes one complete cycle.

For nonsoiled tiles, one cycle is performed.

For 30 soiled tiles, two cycles are performed.

The tiles are air dried for 20 minutes and graded under 150 watt flood lamps by expert graders using the following scale:

1290~.8 -- 18 1 = very heavy filming/streaking 2 = heavy 3 = moderate 4 = light 5 = no visible filming/streaking The results are as follows:

Filming and Streaking 1 0 Formula No Soil Grade 3.4 4.5 Soil Grade 2 . 4 3.6