CA1272135A - Antidandruff shampoos - Google Patents

Abstract

ABSTRACT

ANTIDANDRUFF SHAMPOOS
Antidandruff, lotion shampoo compositions which contain a synthetic surfactant, a particular ethylene glycol diester, an amide, a particulate antidandruff agent and water are disclosed.

Description

~ 3 ~3 ANTiDANDRUFF SHAMPOOS
Thomas Andrew W~!t2 TECHNICAL FIELD
The present inv~ntion is related to antidandruff lotion shampoo compositions which posses~ good s~ability with respece to sepal^ation of the components and suspansion of the antidandruff ag~nt.
BACKGR~UND OF THE INVENTION
Lotion shampoos, both antidandruff as well as nondandruff types, are disclosed in the art. U.S. Patent 3,91?,817, November 5, t975 to Vanierberghe et al. discJoses a shampoo composition containing a piperazine based cationic polymer, 10 sodium alkyl sulfate, 4% Jauryl monoethanolamide and 3~ glycol distearate. U.S. Patent_4 013,787, March 2?, _ 1977 to Vanlerberghe et al. discloses a similar composition. Japanese Appli~tion, wi~h Open for Public Inspection Number 60810, May 19, 1977 (Lion Fat ~ CJil), discJoses shampoos containing 5%
to 50% of an anionic sur~actant, 1~ to 10~ of a fatty acid diethanol amide, 0.1~ to 10% of an insoluble fine powder, and 1~ to 10~ of an ethylenegiycol ester. U.S._ Patent 4,470,982, September 11, 1984 to Winkler discloses lotion antidandruff shampoos containing ethyloneglycol esters and an aneidandruff agent.
While these references disclose compositions which contain components similar to those present in the compositions of the present invention, they do not suggest the advantages found by the present inventor for the compositions disclosed herein.
It Is an object of the present invention, therefore, to provide shampoos containing specific ethyleneglycol es~ers to serve as a suspending agent for a particulate antidandruff agent.

..

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The selected cthylene glycol esters can be used at lower levels ~han other ethylene glycol esters with the result being less interference with the deposition of the antidandruff active.
It is a further object of ~he present inventlon ~o provide effective antidandruff shampoos utilizing reduced levels of the antidandruff actives.
It is still a further object of the present invention to provide antidandruff shampoos exhibiting improved stability.
These and other objects will become readily apparent from the detailed description which follows.
All percentages and ratios herein are by weight unless otherwise indicated.
SUMMARY OF THE INVENTION
__ _ The present invention provides a lo-tion shampoo composition ccmprising by weight, based on said composition:
~) from about 5% to about 30% of a synthetic surfactant;
B) from about 0.5% to about 4% of an ethylene glycol diester wherein the diester is a mixture of 55%-80% steara-te and 45%-20% palmitate;
~0 C) from about 1% to about 7% of an amide;
D) from about 0.1% to about 3% of a pyridinethione metal salt; and E) water ~
wherein the viscosity of said composition is from about 1500 CPS
~5 to about 4500 CPS at 80F., said viscosity being achieved by the inclusion, if necessary, of appropriate viscosity modifiers.
The cc!mposition exhibits improved stability with respect to separation of the components while providing excellent antidandruff efficacy D~TAILED DESCRIPTION
The essential as well as optional components are described in the following paragraphs.

Surfactant An essential component of the present compositions is a surfactant. The surfactant, which may be selected from any of a ~7~
- 2a-wide variety of synthetic anionic, amphoteric, zwitterionic and nonionic surfac~ants, is present at a level of from about 5~ to about 30~, preferably from about 155$ to about 25S~.
Synthetic anionic surfactants can be exemplified by the alkali metal salts of organic sulfuric reaction products having in their molecular structure an alkyl radical containing from 8 - 22 carbon atoms and a sulfonic acid or sulfuric acid ester radical ( included ~0 ~5 in the term alkyl is the alkyl portion of higher acyl radicals).
Pre~rred are the sodium, ammonium, potassium or triethanolamine alkyl sul~ates, especially ~hose obtained by sul~ating the higher alcohols (C8 - C1 8 carbon atoms), sodium coconut oil fatty acid S monoglyceride sulfates and sulfonates; sodium or potassium sal l:s of sulfuric acid esters of the reaction product of 1 mole of a higher fa~ty alcohol fe.g., tallow or coconut oil alcollols) and 1 to 12 moles of ethylen~ oxide; sodium or potassium salts of alkyl phenol ethylene oxide ether sul~ate wi~h 1 to 10 units of e~hylene 10 oxide per molecule and in which the alkyl radicals contain from 8 to 12 carbon atoms, sodium alkyl glyceryl ether sulfonates; the reastion product of fatty acids having from 10 to 22 carbon atoms esterified with isethionic acid and neutralized with sodium hydroxide; water soluble salts of condensation products of fatty 15 acids with sarcosine; and other known in the art.
Zwitterionic surfactants can be exemplified by those which can be broadly described as derivatives of aliphatic quaternary ammonium, phosphonium, and sulfonium compounds, in which the aliphatic radicals can be straight chain or branched, and wherein 20 one of the aliphatic substituents contains frorn about 8 to 18 carbon atoms and one contains an anionic water-solubilizing group, e.g., carboxy, sulfonate, sulfate, phosphate, or phosphonate. A general formula for these compounds is:
(R ) x R2-- Y~+~--CH2 R4- Z(~) wherein R2 contains an alkyl, alkenyl, or hydroxy alkyl radical of from about 8 to about 18 carbon atoms, from 0 to about 1 û
ethylene oxide moieties and from 0 to 1 glyceryl moiety; Y is 30 selected from the group consisting of nitrogen, phosphorus, and sulfur atoms; R3 is an alkyl or monohydroxyalkyl group contain-ing 1 to about 3 carbon atoms; X is 1 when Y is a sulfur atom and 2 when Y is a nitrogen or phosphorus atom; R4 is an alkylene or hydroxyalkylene of from 1 to abou~ 4 carbon atoms ~ ~7~

and Z is a radical selected from the group consisting of carboxylate, sul fonate, sulfate, phosphonate, and phosphate ~roups .
Examples include:
5 4-[N,N-di~2-hydroxyethyl)-N-octadecylammonio]-butane-1-carboxy-late;
5-lS-3-hydroxypropyl-S-hexadecylsulfoniol-3-hydroxypentane-1 -sulfate;
3-1 P, P-diethyl-P-3, 6, 9-trioxatetradexocylphosphonio~ -2-hydrsxy-10 propane-l-phosphate;
3-1 N, N-dipropyl-N-3-dodecoxy-2-hydroxypropylammonio]-propane 1 -phosphonate;
3-( ~1, N-dimethyl-N-hexadecylammonio) propane-l -sulfonate;
3-(N,N-dimethyl-N-hexadecylammonio~-2-hydroxypropane-1-sul-15 fonate;
4-lN,N-di(2-hydroxyethyl)-N-(2-hydroxydodecyl)ammonio]-butane-1 -carboxylate;
3-lS-ethyl-S-(3-dodecoxy-2-hydroxypropyl)sulfonio]-propane-1-phosphate;
20 3-1 P, P-dimethyl-P-dodecylphosphoniol-propane-1 -phospnonate;
and 5-[N~N-di(3-hydroxypropyl)-N-hexadecylammonio]-2-hydroxy-pentane-1 -sulfate .
Other zwitterionics such as betaines are also useful in the 25 present invention. Examples of betaines useful herein include the high alkyl betaines such as coco dimethyl carboxymethyl betaine, lauryl dimethyl carboxymethyl betaine, lauryl dimethyl alpha-carboxy-ethyl betaine, cetyl dimethyl carboxymethyl betaine, lauryl bis-(2-hydroxy-ethyl) carboxy methyl betaine, stearyl 30 bis-(2-hydroxy-propyl~ carboxymethyl betaine, oleyl dimethyl gamma-carboxypropyl betaine, lauryl bis-12-hydroxypropyll alpha-carboxyethyl betaine, etc. The sulfobetaines may be repre-sented by coco dimethyl sulfopropyl betaine, stearyl dimethyl sulfopropyl betaine, lauryl dimethyl sulfoethyl betaine, lauryl 35 bis-(2-hydroxy-ethyl ) sulfopropyl betaine and the like; amido betaines and amidosulfobetaines, wherein a RCONH(CH213 radical is a~tached to the nitrogen atom of the betaine are also useful in this invention. The amido betaines are preferred for use in some of the compositions of ~his inven~ion.
Examples of amphoteric surfactants which can be used in the compositions of the present invention are those which can be broadly described as derivatives of alipha~ic secondary and terti-ary amines in which the aliphatic radical can be straight chain or branched and wherein one c~f the aliphatic substituents contains t~ from about 8 ~o abos~t 18 carbon atoms and one contains an anionic water solubilizing group, e.g., carboxy, sulfonate.
suffate, p~osphate, or phosphonate. Examples of compounds faJling within this definition are sodium 3-dodecyl-aminopropionate, sodium 3-dodecylaminopropane su3fonate, N-aikyttaurines such as the one prepared by reacting dodecylamine with sodium isethionate according ~o the teaching of U,S. Patent

2!658,072, N-higher alkyl aspartic acids such as those produced according to the teaching of U.S. Patent 2,438,091, and the products sold under the trademark "Miranol" and described in U.S. Patent 2,52B,~78.
Nonionic surfactants, which are preferably used in combination with an anionic, amphoteric or zwitterionic surfactant, can be broadly defined as compounds produced by ~he conden-sation of alkylene oxicle groups (hydrophilic in nature) with an Drganic hydrophobic compound, which may be aliphatic or alkyl aromatic i~t nature. Examples of preferred classes of nonionic surfactants are:
1. The polyethylene oxide condensates of alkyl phenols, e.g., the condensation products of alkyl phenols having an all;yl group containing from about 6 to 12 carbon atoms in either a straight chain or branched chain configuration, with ethylene oxide, the saict e~hy~ene oxide being presen~ in amounts equa I to 10 to 60 moles of ethylene oxide per moie of alkyl phenol. The alkyl substituent in suc~ compounds may be derived froM
polyrrer~e~ propyJene, dllsot~utylene, octane, or nonane, for example .

-2. Those derived from the condensation of ethylene oxide with tlle product resulting from the reaction of propylene oxide and ethylene diamine products which may be varied in composition depending upon the balance between the hydrophobic and hydrophilic elements which is desired~ For example, compounds containing from about 40% to about 80% polyoxyethylene by weight and having a molecular weight of from about 5,00û ~o about 11,000 resultin~ from the re~ction o~ 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.

3. The condensation product of aliphatic alcohols having from 8 to 18 carbon atoms, in either strai~3ht chain or branched chain configuration, with ethylene o~dde, e.g., a coconut alcohol ethylene oxide condensate having from 10 ~o 30 moles of ethylene oxide per mole of coconut alcohol, the coconut alcohol fraction having from 10 to 14 carbon atoms.

4. Long chain tertiary amine oxides corresponding to the following general formula:
R1 R2R3N ~ O
wherein R1 contains an alkyl, alkenyl or monohydroxy alkyl radical of from about 8 to about 18 carbon atoms, from 0 to about 10 ethylene oxide moieties, and from 0 to 1 glyceryl moiety, and R2 and R3 contain from 1 to about 3 carbon atoms and from 0 to about 1 hydroxy group, e.g., methyl, ethyl, propyl, hydroxy ethyl, or hydroxy propyl radicals. The arrow in the formula is a conventional representation of a semipolar bond. Examples of amine oxides suitable for use in this invention include dimethyl-dodecylamine oxide, oleyldi(2-hydroxyethyl) amine oxide, dimethyloctylamine oxide, dimethyl-decylamine oxide, dimethyl-tetradecylamine oxide, 3,6,9-trioxaheptadecyldiethylamine oxide, d i ( 2-hyd roxyethy I ) -tetradecy lami ne ox ide, 2-dode-coxyethy Id i -methylamine oxide, 3-dodecoxy-2-hydroxypropyldil3 hydroxy-propyl~amine oxide, dimethylhexadecylamine oxideO
S. Long chain tertiary phosphine oxides corresponding to the following general formula:
RR' R"P ) O

wherein R contains an alkyl, alkenyl or monohydroxyalkyl radical r~ng;ny from 8 to 18 carbon atoms in chain length, from 0 to about tO ~thylene oxide moieties and from O to ï glyceryi moiety and R' and R" are each alkyl or monohydroxyalkyl groups

5 con.aining from 1 to 3 carbon atoms. The arrow in the formula is a conventional representation of a semipolar bond. Examples of suit3ble phosphine oxides are:
dodecyldimethylphosphine oxide, tetradecyldimethylphosphine oxide, tetradecylmethylethylphosphine oxide, 3,~,9,-trioxa-tO octadecyldime~hylphosphine oxide, cetyldimethylphosphine oxide,3-dodecoxy-2-hydroxypropyldi~2-hydroxyethyl~ Fshosphine oxide, stearyldim~thylphosphine oxide, cetylethylpropylphosphin~ oxide, oley~diethylphosphine o~side, dodecyldiethylpho~phine oxide, t~tradecyldiethylphosphine oxide, dodecyldipropylphosphine oxide, 15 dodecyldi(hydroxymethyl)phosphine oxide, dodecyldi(2-hydroxy-ethyl ) phosphine oxide, tetradecylmethyl-2-hydroxypropylphosphine oxide, oleyldimethylphosphine oxide, 2-hydroxydodecyldimethyl-phosphine oxide.

6. Long ~hain dialkyl sulfoxides containing one short chain 20 alkyl or hydroxy alkyl radical of 1 to about 3 carbon atoms (usually methyl) and one long hydrophobic chain which contain alkyl, alkenyl, hydroxy alkyl, or keto alkyl radicals containing from about 8 to about 20 carbon atoms, from 0 to about 10 ethylene oxide moieties and fron- 0 to 1 glyceryl moiety. Exam-25 ples include:octadecyl methyl sulfoxide, 2-ketotridecyl methyl sulfoxide, 3,6,9,-trioxaoctadecyl 2-hydroxyethyl sulfoxide, do~ecyl methyl sulfoxide, oleyl 3-hydroxypropyl sulfoxide, tetradecyl methyl sulfoxide, 3-methoxytridecyl methyl sulfoxide, 3-hydroxytridecyl 30 methyl sulfoxide, 3-hydroxy-4-dodecoxybutyl methyl sulfoxide.
Many additional nonsoap surfactants are described in McCUTCHEON'S, DFTERG~NTS AND EMULSIFIERS, 1983 Annual, published by Allured Publishing Corpc~ration.

The above-mentioned surfactants can be used alone or in combination in the shampoo compositions of the present invention.
Tha anionic surfactants, particularly the alkyl sulfates, the ethoxylated alkyi sulfates and mixtures thereof are preferred for 5 use herein as well as the amido betaines.
Ethylene Glycol Ester The ethylene glycol esters found useful in the compositions of the presen~ invention are diesters wherein the esters are a mixture of palmita~e and stearate. The amount of stearate should be in the range-of about 10~ to about 4296 or in the range of about 55% to about 80~ wi~h palmitate accounting for the remainder. The amount of stearate is preferably from about 60 to aboLIt 75%.
The amount of the ester useful in the present invention is from about 0. 5% to about 4~, preferably from about 1% to about 4%. It has been surprisingly found eha~ these levels provide for improved stability whereas materials not meeting the ester requirement would have to be used at much higher levels to achieve similar stability.
Amide _ .
The amide used in the present compositions can be any of the alkanolamides of fatty acids known for use in shampoos.
These are generally mono- and diethanolamides of fatty acids having from about 8 to about 14 carbon atoms. Preferred are coconut monoethanolamide, coconut diethanolamide and mixtures thereof. Other amides are those having multiple ethoxy groups such as PEG-3 lauramide.
The amide is present at a level of from about 1% to about

7%, preferably from about 2~ to about 5%.
Antidandruf~ent Another essential ~omponen~ of the present invention is a particulate pyridinethione antidandruff agent. Included among such agents are -2-zinc pyridinethione and other 1-hydroxy pyridinethiones such as those disclosed in U.S. Patent 2,809,971, October 15, 1957 to Bernstein, U . S . Patent 3,236, 733, February 22, 1966 to Karsten, et al., U.S. Patent 3,753,196, ~ ~7~3~

Au~st 21,_ l9?3 to Parran, U.S. Patent 3,761,418, September 25, ?9?3 to Parran and U.S. Patent 4,379,753, April 12, 1983 to Bol ich, J r .

Preferred pyridinethione salts are those haYing a median particle diameter o~ at least 1.2 microns.
Also preferred are ehe metal salt pyridinethione salts of the type disclosed in-~he '753 pa~ent to Bolich, Jr. Zinc pyridine-thione is the preferred agent, particularly where its salt crystals are predominantty flat platelets which have a mean ~phericity less than about 0. 65, preferably betwean about 0. 20 and abou~ û . 65, and a individua3 median particle diameter of at least about 2~L, expressed as the diameter of a sphere of equivalent volume.
The diameter of a sphere of equivalent volume, d~, for a particle can be determined by a variety of sedimentation tech-niques which are based on Stokes' Law for the set~ling velocity of a particle in a fluid. Such teehniques are described in Stockham, J, D, and Fochtman, E. Ci., Particle Size Analysis, Ann Arbor Science, 1978.
~0 The sphericity of a particle is also described by Stockham and Fochtman at page 113 as d 2 d5 where dv is the diameter of a sphere of equivalent volume, supra, and d5 is the diameter of a sphere of equivalent area. A
technir~ue for determining ds is the BET technique described by Stockham and Fochtman at page 122.
Since the sphericity of interest herein is the mean sphericity, the mean diameters are employed.
The particulate antidandruff agent is presen~ at a level of 0.1~ to about 3~, preferably frorn about 0.3% to about 2%.
Water Water is the remaining essential component of the present compositions and is present at a levet of from about 50% to about ,~

7~ 3 80~., preferably from about 60% to about 75%. The viscosity of the present compositions is generally in the range of about 1500 centistokes (CPS) to about 4500 CPS, preferably from about 2000 CPS to about 4000 CPS. (Wells-Brookfield Viscometer/CP-40 Cone model HBT-2000/0.5 cc of product at 2 RPM and 80 F.). This viscosity is achieved by the inclusion if necessary of viscosity modifiers and hydrotropes as listed below.
OPtional Components The shampoos herein can contain a variety of nonessential optional components suitable for rendering such compositions more acceptable.
Such conventional optional ingredients are well known to those skilled in the art, e.g., preservatives such as benzyl alcohol, methyl paraben, propyl paraben, methylisothiazolinone and imidazolidinyl urea;
thickeners and viscosity modifiers such as amine oxides, block polymers of ethylene oxide and propylene oxide such as "Pluronic F88" offered by BASF Wyandotte, fatty alcohols such as cetearyl alcohol, sodium chloride,i. ammonium chloride, sodium sulfate, polyvinyl alcohol, propylene glycol and ethyl alcohol; hydrotropes such as xylene sulfonate; pH adjusting agents such as citric acid, succinic acid, phosphoric acid, sodium hydroxide, sodium carbonate, etc.; perfumes;
dyes; quaternary ammonium compounds such as "Polyquaternium 41"; and, saquestering agents such as disodium ethylenediamine tetraacetate. Such agents generally are used individually at a level of from about 0.01% to about 10~, preferably from about 0.01% to about 5.0% by weight of the composition~
Another optional component found useful in the present compositions is ~ l-hydroxy-2 pyridone of the type disclosed in U~S. Patent 3~883.545~
Mav 13~ 1475 to Lohaus et al. Such agents when used in combination with the aforedescribed pyridinethiones are particularly preferred. These auxiliary antidandruff agents are used at a level of from about 0. l~/o to about 2X, preferably from about 0.2% to about 1%.
The compositions herein are preferably free of anionic and nonionic clays and polymeric thickeners. By "free" is meant less than about 10 ppm.
* Trade mark ** Trade mark r~

METHOD OF MANUFACTUR
Methods for manufacturing the present compositions are disclosed in Examples I and I i .
I NDUSTRIAL APPLi l:~ABI LITY
...._ S The present compositions are used in a conventional manner for cleaning hair. From about 0.1g to about 209 of a composition is applied to hair that has been wetted, generally with water, worked through the hair and then rinsed out.
The following Examples further describe and demonstrate the 1 n preferred embodiments within the scope of the presen~ invention .
The Examples are given solely for the purpose of illustration and are not to be construed as limitations of the present invention as many variations thereof are possible without departing from its spirit and scope.

The following composition is representative of the present invention .
Component Weight Zinc pyridinethione (ZPT)1 1.000 Triethanolamine Alkyl Sulfate 19.390 Coconut Monoethanoiamide 3.000 Ethylene Glycol Distearate 3 . 000 Sodium Chloride up to 2 . 500 to obtain desired viscosity 2S Propylene Glycol 0.500 Preservative 0 . 033 Perfume 0. 600 Citric Acid 0. 65 Dye (1% Aqueous Solution~ 0.30 Water qs 1 oos~
1 ZPT having a median particle size of about 2.0 microns 2 Ethylene glycol distearate wherein the ester groups are not pure stearate but a mixture of palmitate and stearate in the ratio of 35: 65 .
This composition is prepared by heating part of the water to about 66C to 88C. The sodium chloride, citric acid and surfactan~ are added to the water while it is heating. After the desired temperature is obtained, the amide, dye and ethylene glycol distearate are added and mixing continues for 1 n minutes .
The solution is then cooled to about 21C to 49C. Af~er this 5 cooler temperature is obtained, the zinc pyridinethione, the preservative, perfume and the remainder of the water is add~d and mixing continues for 5-10 more minutes.
EXAMPLE l I
The following is another composition represen~ative of the present invention.
Component Weig~
Ammonium Lauryl Sulfate 9.270 Ammonium Lauryl (Ethoxy)3 Sulfate 10.230 Citric Acid 0.160 Ethylene Glycol Distearatel 3.00û
Coconut Monoethanolamide ~s.000 Ammonium Xylene Sulfonate 2.170 Dye (1% Aqueous Solution) 0.100 Propylene Glycoi 0. 750 Zinc Pyridinethione ~ZpT~2 1.000 Preservative 0 . 027 Perfume 0 . 650 Water qs 100 . 000 1 Same as Example I
25 2 ZPT in platelet form having a median individual particle diameter of about 15 microns The above composition is prepared by mixing part of the water, part of the surfactant, citric acid, amide, distearate and dye together in a mix tank and heating the mixture to from about 66C to about 88C. The mixture is then cooled to from about 21C to about 49C. After this cooling has taken place, the perfume, zinc pyridinethione, preservative and the remainder of the water and surfactant are added. The totai mixture is aoitated until a homogeneous mixture was obtained.
EXAI~PLE l l i The following compositions were prepared and tested for their ability to suspend zinc pyridinethione.

~L~J~

Component Wei~ht %
A B C D
TEA Alkyl Sul~ate19 . 400% 19 . 4ûO~,19 . 400~, 19 . 400%
Sodium Chloride1 . 200 1 . 200 1 . 200 1 . 200 Citric Acid 0.650 0.650 0.6~0 0.650 Coconut Monoethanolamide 3 . 000 3 . 000 3 . 000 3 . 000 Ethylene Glycol Distearate - 3.000 3.000 3.000 3.000 Perfume 0 . 600 0 . 600 û . 600 0 . 600 Dye 0.320 U.320 0.320 0.320 Preservative 0 . 033 0.033 0.033 0.033 Zinc pyridinethi-one2 ~ZPT) 1.000 1.00Q 1.ûO0 1.000 Yllater qs 1009~ ~

-A ECDS having a stearate:palmitate ratio of 53:47 1-B EGDS having a stearate:palmitate ratio of 59:41 20 l-C E~iDS having a stearate:palmitate ratio of 48:52 1-D EGDS having a stearate:palmitate ratio of 65:35 2 ZPT having a median individual particle diameter of about 2 microns These compositions were prepared in the manner described in 25 Example 1. After preparation the compositions were packed into hOteles, compositions A and B into 4 oz. bottles and C and D into 7 oz. bottles. Compositions A and B were stored at 110F for 3.5 months while compositions C and D were stored at 120F for 1.5 months. After these storage periods the samples were frozen and 30 the top one third of samples A and B and the top quarter of samples C and D was removed for analysis. The sections were thawed, mixed thoroughly and analyzed. In the comparison of A
with 8, B, within the scope of the present invention, had 1.01 ZPT while A, outside the scope of the present invention, had 35 only 0.93% ZP~. In the comparison of C with D, D, within the -scope of the present invention, had 1.00~ 7PT while C, outside the scope, had only 0.95% ZPT. it is seen that the pressnt compositions provide for marked improvement in the suspension of the Z PT .

WHAT IS CLAIMED IS:
lC

Claims (15)

CLAIMS: - 15 -

1. A lotion shampoo compostion comprising by weight, based on said composition:
A) from about 5% to about 30% of a synthetic surfactant;
B) from about 0.5% to about 4% of an ethylene glycol diester wherein the diester is a mixture of 55%-80% stearate and 45%-20%
palmitate;
C) from about 1% to about 7% of an amide;
D) from about 0.1% to about 3% of a pyridinethione metal salt; and E) water wherein the viscosity of said composition is from about 1500 CPS to about 4500 CPS at 80°F., said viscosity being achieved by the inclusion, if necessary, of appropriate viscosity modifiers.

2. A shampoo composition according to Claim 1 wherein the surfactant is anionic.

3. A shampoo composition according to Claim 1 wherein the pyridinethione metal salt is zinc pyridinethione.

4. A shampoo composition according to Claim 1 wherein the level of surfactant is from about 15% to about 25% by weight, based on said composition.

5. A shampoo composition according to Claim 4 wherein the level of ethylene glycol diester is from about 1% to about 4% by weight, based on said composition.

6. A shampoo composition according to Claim 5 wherein the level of the pyridinethione metal salt is from about 0.3% to about 2% by weight, based on said composition.

7. A shampoo composition according to Claim 6 wherein the surfactant is anionic.

8. A shampoo composition according to Claim 7 wherein the pyridinethione metal salt is zinc pyridinethione.

9. A shampoo composition according to Claim 8 wherein the surfactant is selected from the group consisting of alkyl sulfates.

10. A shampoo composition according to Claim 1 which in addition contains a 1-hydroxy-2 pyridone compound.

11. A shampoo composition according to Claim 1 which in addition contains a xylene sulfonate.

12. A method of shampooing human hair comprising:
A) applying from about 0.1g to about 20g of a composition according to Claim 1 to hair that has been wetted;
B) working said composition through said hair; and C) rinsing said composition from said hair.

13. A method according to Claim 12 wherein the composition is in accordance with Claim 4.

14. A method according to Claim 12 wherein the composition is in accordance with Claim 6.

15. A method according to Claim 12 wherein the composition is in accordance with Claim 8.