WO2011131452A2

WO2011131452A2 - Composition

Info

Publication number: WO2011131452A2
Application number: PCT/EP2011/054521
Authority: WO
Inventors: Qunhua Cao; Amit Jayaswal; Liang JI; Ci Song; Shuhong Yuan
Original assignee: Hindustan Unilever Ltd; Unilever NV
Current assignee: Hindustan Unilever Ltd; Unilever NV
Priority date: 2010-04-21
Filing date: 2011-03-24
Publication date: 2011-10-27
Anticipated expiration: 2012-10-21
Also published as: WO2011131452A3

Abstract

Hair care composition comprising from 1.2 to 3% wt. particulate anti-dandruff active and a polymer selected from acrylic acid based polymers and acrylate/C10-30 alkyl acrylate copolymers, and a water-soluble, nonionic cellulose.

Description

COMPOSITION

The present invention relates to hair care compositions comprising high levels of pyrithione.

Despite the prior art there remains a need for improved anti-dandruff hair care compositions.

Accordingly, the present invention provides a hair care composition comprising from 1 .2 to 3% wt. particulate anti-dandruff active a carbomer and a water-soluble, nonionic cellulose.

We have surprisingly found that compositions comprising elevated levels of particulate anti-dandruff actives are often unstable. Surprisingly, we also found that they are stable in the presence of a polymer selected from acrylic acid polymers and acrylic/C 10-30 alkyl acrylate copolymers, and a water-soluble, nonionic cellulose.

Preferably, the particulate anti-dandruff active is a salt of pyrithione.

Preferably, the pyrithione salt is a zinc salt. Zinc pyrithione is the preferred anti- dandruff active.

Preferably, the pyrithione salt comprises from 1 .7 to 2.3% wt. of the composition.

Preferably, the pyrithione salt comprises from 1 .9 to 2.1 % wt. of the composition. Preferably, the acrylic acid polymer is a carbomer. Preferably, the carbomer is Carbopol 980® ex Lubrizol. Preferably, the carbomer comprises from 0.01 to 5% wt. of the composition.

More preferably, the carbomer comprises from 0.05 to 1 % wt. of the composition. Most preferably, the carbomer comprises from 0.6 to 0.9% wt. of the composition.

Commercially available acrylate/C10-30 alkyl acrylate copolymers include

Carbopol® Ultrez 20 ex. Lubrizol. Where present, the composition comprises from 0.01 to 5% wt. of the composition acrylate/C10-30 alkyl acrylate copolymer. More preferably, from 0.05 to 1 % wt. of the composition and most preferably from. 0.5 to 0.9% wt. of the composition.

The hair care composition of the invention comprises a water-soluble, nonionic cellulose ether.

By "water-soluble" is meant any material that is sufficiently soluble in water to form a clear solution to the naked eye at a concentration of 1 .0% or more by weight of the material in water at 25°C, as described above.

Preferred water-soluble nonionic cellulose ethers are methylcellulose and hydroxypropyl methylcellulose. These materials are manufactured by heating cellulose fibres with caustic solution which in turn is treated with methyl chloride, yielding the methyl ether of cellulose. Methylcellulose is made using only methyl chloride. For hydroxypropyl methylcellulose, propylene oxide is used in addition to methyl chloride to obtain hydroxypropyl substitution on the anhydroglucose units. This substituent group, --OCH₂CH(OH)-CH3, contains a secondary hydroxyl on the number two carbon. The amount of substituent groups on the anhydroglucose units influences the solubility properties of the cellulose ether. Accordingly, suitable methylcelluloses and hydroxypropyl methylcelluloses for use in the hair care composition of the invention have a sufficient degree of methoxyl or methoxyl/hydroxypropyl substitution to cause them to be water-soluble as defined above. Methyl cellulose and hydroxypropyl methylcellulose are commercially available in a number of viscosity grades from Dow Chemical as their METHOCEL trademark series. Hydroxypropyl methylcellulose is most preferred, and is available from Dow Chemical as their METHOCEL E, F, J, K and 40-Series products. Generally the viscosity of the water-soluble, nonionic cellulose ether ranges from 100 to 100,000, preferably from 4,000 to 75,000 mPas for a 2% aqueous solution at 20° C, measured by Ubbelohde tube viscometer.

Examples of preferred commercially available materials are METHOCEL 40-100, METHOCEL 40-101 and METHOCEL 40-202 from Dow Chemical.

Mixtures of any of the above water-soluble nonionic cellulose ethers may also be suitable. Water-soluble nonionic cellulose ether will generally be present in compositions of the invention at levels of from 0.01 to 2.0%, preferably from 0.1 to 0.5%, more preferably from 0.1 to 0.3%, by total weight of cellulose ether based on the total weight of the composition. Preferably, the composition comprises from 0 up to 0.27% wt. cationic deposition polymer. Preferred cationic deposition polymers include cationic cellulose derivatives, cationic starch derivatives, and cationic guar gum derivatives. More preferably, the composition comprises from 0.001 to 0.25% wt cationic deposition polymer. Cationic deposition polymers suitable for use in compositions of the invention include monomers of the formula:

A-O-[R-N⁺(R¹)(R²)(R³)X^"], wherein: A is an anhydroglucose residual group, such as a starch or cellulose anhydroglucose residual. R is an alkylene, oxyalkylene, polyoxyalkylene, or hydroxyalkylene group, or combination thereof. R¹, R² and R³ independently represent alkyl, aryl, alkylaryl, arylalkyl, alkoxyalkyl, or alkoxyaryl groups, each group containing up to about 18 carbon atoms. The total number of carbon atoms for each cationic moiety (i.e., the sum of carbon atoms in R¹, R² and R³) is preferably about 20 or less, and X is an anionic counterion.

The composition may be any hair care composition for example a shampoo, conditioner, styling composition, mask and whether it be a leave on treatment or a rinse off treatment. Preferably, the composition is a shampoo composition.

Preferably, the composition is a pourable shampoo composition with a viscosity between 4000cps and 7000cps using a Brookfield viscometer using spindle RV5 at 30°C.

Shampoo compositions comprise from 5 to 50% wt. cleansing surfactant where the cleansing surfactant is selected from anionic and amphoteric surfactants. Preferably, the cleansing surfactant comprises a mixture of anionic and

amphoteric surfactants. Preferred anionic surfactants include the alkali-metal alkyl ether sulphates such as SLES where the average EO number is from 1 to 3, preferably 1 . Preferred amphoteric surfactants include cocamidopropyl betaine and CMEA. EXAMPLE 1

Compositions comprising varying levels of carbomer and in the presence and absence of methylcellulose were tested for their stability in the presence of 2% ZPTO.

^* Methocel 40-202

*^* Carbopol 980

The test results show that whereas the compositions suspended with carbomer were unstable those suspended with a mixture of carbomer and methylcellulose were stable. EXAMPLE 2

1 . Five glass containers (diameter 4cm, height 5.5cm) are filled with about 80gm shampoo respectively, to monitor phase separation/cracking, color. They are separately placed at 4°C, 25°C, 37°C, 45°C and 50°C (Torture test).

2. In parallel, the other five glass containers were fully filled respectively, to monitor pH and Viscosity (measured at 30°C), and functional active (e.g. ZPTO)/claim and microbiology. They are separately placed at 4°C, 25°C, 37°C, 45°C and 50°C(Torture test), too. At Fresh(± 2days), 1wks(for torture test only), 4wks, 8wks and 12wks, all the glass containers would be taken out to be assessed as mentioned in item 1 and 2.

a. pH and viscosity should be within product specification limits after 12wks at 25°C and 45°C.

b. Functional ingredient (e.g. ZPTO) should be within functional range after 12wks at 25°C and 45°C.

c. Phase separation, transparent liquid from top level should be within 0.3cm, and over 0.3cm will not be acceptable after 12wks at 25°C, 37°C and 45°C. For torture test, it should be within 0.3cm after 1 wk at 50°C.

d. Cracking in shampoo texture (AD shampoo) should be less than 50% after 12wks at 25°C, 37°C and 45°C.

e. The color change perceived significantly is not acceptable after

12wks.

Claims

1 . Hair care composition comprising from 1 .2 to 3% wt. particulate anti- dandruff active characterized by a polymer selected from acrylic acid based polymers and acrylate/C10-30 alkyl acrylate copolymers, and a water- soluble, nonionic cellulose.

2. Composition according to claim 1 wherein the particulate anti-dandruff active is a pyrithione salt.

3. Composition according to claim 2 wherein the pyrithione salt is a zinc salt.

4. Composition according to any preceding claim wherein the particulate anti- dandruff active comprises from 1 .7 to 2.3% wt. of the composition.

5. Composition according to any of claims 1 to 3 wherein the pyrithione salt comprises from 1 .9 to 2.1 % wt. of the composition.

6. Composition according to any preceding claim wherein the methyl cellulose is a hydroxypropyl methyl cellulose or a methyl cellulose.

7. Composition according to any preceding claim wherein the polymer

comprises from 0.01 to 5% wt. of the composition.

8. Composition according to any preceding claim wherein the polymer

comprises from 0.05 to 1 % wt. of the composition.

9. Composition according to any preceding claim wherein the polymer

comprises from 0.5 to 0.9% wt. of the composition.