Transparent aqueous compositions comprising hydrophobic silicone oils

• US 20040014879A1
• Filed: 07/09/2003
• Published: 01/22/2004
• Est. Priority Date: 10/30/2000
• Status: Active Grant

• Current Assignee: Kao Chemicals Europe SL (KAO Corporation)
• Original Assignee: Kao Chemicals Europe SL (KAO Corporation)
• Inventors: Denzer, Horst, Jansen, Rosemarie, Buhmann, Andrea, Pytlik, Monika, Abe, Hiroshi
• Granted Patent: US 6,803,050 B2
• Time in Patent Office: Days
• US Class Current: 524/588
• CPC Class Codes: A61K 2800/262 Transparent; Translucent
• CPC Class Codes: A61K 8/39 Derivatives containing from 2 to 10 oxyalkylene groups
• CPC Class Codes: A61K 8/45 Derivatives containing from 2 to 10 oxyalkylene groups
• CPC Class Codes: A61K 8/463 containing sulfuric acid derivatives, e.g. sodium lauryl sulfate
• CPC Class Codes: A61K 8/585 Organosilicon compounds
• CPC Class Codes: A61Q 5/02 Preparations for cleaning the hair

Abstract

The invention relates to optically transparent aqueous compositions containing hydrophobic silicone oil and a comparably low amount of wash-active matter, being suitable as a hair treatment composition such as a shampoo. In particular, it provides an optically transparent aqueous composition comprising (a) a hydrophobic silicone oil in an amount of 1-3 wt.-% with respect to the total weight of the composition; (b) a solubilizer for the silicone oil; and (d) an anionic surfactant; wherein the weight-ratio of component (b) to component (a) is in the range of 1:1 to 12:1; and wherein the total amount of the components (b) and (c) is in the range of 10-25 wt.-% with respect to the total weight of the composition. The invention also provides a method for preparing the above composition.

Claims

1. An optically transparent aqueous composition comprising

(a) a hydrophobic silicone oil in an amount of 1-3 wt.-% with respect to the total weight of the composition;

(b) a solubilizer for the silicone oil; and

(c) an anionic surfactant;

wherein the weight ratio of component (b) to component (a) is in the range of 1;

1 to 12;

1; and

wherein the total amount of the components (b) and (c) is in the range of 10-25 wt.-% with respect to the total weight of the composition.

2. The aqueous composition according to claim 1,

wherein the solubilizer is a cryptoanionic surfactant, a non-ionic surfactant, a mixture of a non-ionic surfactant with an amphoteric surfactant, or a mixture of a non-ionic surfactant with a cryptoanionic surfactant.

3. The aqueous composition according to claim 2,

wherein the solubilizer comprises an alkyl ether carboxylate derived from alkanols having 6 to 22 carbon atoms.

4. The aqueous composition according to claim 2 and 3,

wherein the solubilizer is a mixture of alkyl ether carboxylate derived from alkanols having 6 to 22 carbon atoms with ethoxylated products derived from polyhydric alcohols.

5. The aqueous composition according to claim 2,

wherein the solubilizer comprises an ethoxylated glyceride derived from carboxylic acids having 6 to 22 carbon atoms.

6. The aqueous composition according to claim 5,

wherein the solubilizer comprises glycereth-17 cocoate.

7. The aqueous composition according to claim 2,

wherein the solubilizer comprises a compound of the following formula (III):

R—

O—

(CH₂CH₂O)_m—

CH₂—

CO—

N(R″

)(CH₂CH₂O)_nR′

wherein R is an alkyl group or alkenyl group having 6 to 22, preferably 12 to 18, more preferably 13 to 15 carbon atoms;

R′

is a hydrogen atom or an alkyl group or alkenyl group having 6 to 22, preferably 12 to 18, more preferably 13 to 15 carbon atoms;

R″

is a hydrogen atom or an alkyl group having 1 to 5 carbon atoms which is optionally hydroxylated, preferably a hydrogen atom, a methyl group, an ethyl group or a hydroxyethyl group;

m has a value in the range of 1 to 10, preferably 1 to 3, most preferably 2; and

n has a value in the range of 0 to 10, preferably 0 to 5.

8. The aqueous composition according to claim 7,

wherein the solubilizer comprises a compound of the formula (III) wherein m is 2, n is 1, R represents an alkyl group having 13 to 15 carbon atoms;

and both R′ and

R″

represent a hydrogen atom.

9. The aqueous composition according to any of the preceding claims, wherein the hydrophobic silicone oil is a non-volatile silicone oil.

10. The aqueous composition according to any of the preceding claims, additionally containing a vegetable oil.

11. The aqueous composition according to claim 10,

wherein the hydrophobic silicone oil is a volatile silicone oil.

12. The aqueous composition according to claim 2,

wherein the amphoteric surfactant is lauryl hydroxysultaine.

13. The aqueous composition according to claim 2 or 12,

wherein the amphoteric surfactant is present in an amount of 4 to 8 wt.-% with respect to the total weight of the composition.

14. The aqueous composition according to any of the preceding claims, wherein the anionic surfactant is sodium lauryl ether sulfate having an average degree of ethoxylation in the range of 1 to 3.

15. The aqueous composition according to any of the preceding claims, wherein the composition has a viscosity of at least 1500 mPa s.

16. The aqueous composition according to any of the preceding claims, wherein the composition has a a pH value in the range of 5 to 8.

17. Method for preparing a composition according to claim 1, comprising the steps of:

(a) mixing silicone oil with a solubilizer for the silicone oil in a weight ratio of solubilizer to silicone oil in the range of 1;

1 to 12;

1 at a temperature of 20°

C. or less; and

(b) adding anionic surfactant and stirring until an optically transparent composition is obtained.

18. Hair shampoo comprising the composition of any of claims 1 to 16.