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1. WO2006102010 - SILICONE EMULSION, METHOD OF PREPARING SAME, AND COSMETIC INGREDIENT

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[ EN ]

That which his claimed is:

1. A silicone emulsion, comprising:
(A) a polyorganosiloxane containing not greater than 10% (w/w) of cyclic organosiloxane tetramer;
(B) a surfactant having the formula:



wherein each R^ is independently -H or -F, R^ is -H, hydrocarbyl, or substituted
hydrocarbyl, each R4 is independently R^ or -(CH2CH2θ)mR3, wherein m is from 1 to 20, and M is a metal ion or an ammonium ion; and
(C) water.

2. The silicone emulsion according to claim 1, wherein the polyorganosiloxane of component (A) has a weight-average molecular weight of from 50,000 to 5,000,000.

3. The silicone emulsion according to claim 1, wherein component (A) contains not greater than 3.5% (w/w) of cyclic organosiloxane tetramer.

4. The silicone emulsion according to claim 1, wherein component (B) is a salt of taurocholic acid.

5. The silicone emulsion according to claim 1, wherein the concentration of component (B) is from 0.1 to 50 parts by weight per 100 parts by weight of component (A).

6. A cosmetic ingredient comprising the silicone emulsion according to claim 1.

7. The cosmetic ingredient according to claim 6, further comprising an additive selected from nonionic surfactants, anionic surfactants, pH-adjusting agents, antiseptics, mildew-proofing agents, and rust preventives.

8. The cosmetic ingredient according to claim 6, further comprising an additive selected from film forming agents, anti-freezing agents, oily components, emulsifiers, wetting agents, anti-dandruff agents, anti-oxidants, chelating agents, UV absorbers, fragrances, and colorants.

9. A method of preparing a silicone emulsion, the method comprising:
(i) emulsifying a mixture comprising (A') an organosiloxane having the formula
HO(R^SiO)nH, where each R* is independently hydrocarbyl or substituted hydrocarbyl, and n has a value such that the organosiloxane has a weight-average molecular weight of from 92 to 100,000; (B1) a surfactant having the formula:



wherein each R^ is independently -H or -F, R^ is -H, hydrocarbyl, or substituted
hydrocarbyl, each R4 is independently R-^ or -(CH2CH2O)mR^, wherein m is from 1 to 20, and X is -OH or -O" M, wherein M is a metal ion or an ammonium ion, and (C) water;
(ii) polymerizing the organosiloxane of the emulsified mixture in the presence of an acid catalyst to produce a polyorganosiloxane having a weight-average molecular weight of at least 2 times the weight-average molecular weight of the organosiloxane; and
(iii) neutralizing the acid catalyst.

10. The method according to claim 9, wherein component (B') is selected from
taurocholic acid, a salt of taurocholic acid, or a mixture thereof.

11. The method according to claim 9, wherein the mixture of step (i) further comprises at least one organosilane having at least one silicon-bonded hydrolysable group.

12. The method according to claim 9, further comprising, after step (i) and before step (ii), treating the emulsified mixture with at least one organosilane having at least one silicon-bonded hydrolysable

13. The method according to claim 9, wherein the mixture of step (ii) is emulsified for a period of time sufficient to produce a particle size of from 200 to 3,000 nm.

14. The method according to claim 9, wherein the polyorganosiloxane has a weight-average molecular weight of at least 20 times the weight-average molecular weight of the organosiloxane.

15. A silicone emulsion prepared according to the method of claim 9.