Organopolysiloxane gels for use in cosmetics

• US 6,423,322 B1
• Filed: 05/22/1999
• Issued: 07/23/2002
• Est. Priority Date: 05/22/1999
• Status: Expired due to Term

• Current Assignee: Wacker Chemical Corporation
• Original Assignee: Wacker Silicones Corporation
• Inventors: Fry, Bryan E.
• Primary Examiner(s): JONES, DAMERON LEVEST
• Application Number:
  US09/317,093
• Time in Patent Office: 1,158 Days
• Field of Search: 424/400, 424/401, 424/59, 424/60, 424/64, 424/43, 424/47, 424/46, 514/772
• US Class Current: 424/401
• CPC Class Codes: A61K 2800/262 Transparent; Translucent
• CPC Class Codes: A61K 8/042 Gels
• CPC Class Codes: A61K 8/891 saturated, e.g. dimethicone, phenyl trimethicone, C24-C28 methicone or stearyl dimethicone
• CPC Class Codes: A61Q 19/00 Preparations for care of the skin
• CPC Class Codes: C08G 77/12 containing silicon bound to hydrogen C08G77/045 takes precedence
• CPC Class Codes: C08G 77/20 containing silicon bound to unsaturated aliphatic groups C08G77/045 takes precedence
• CPC Class Codes: C08K 5/56 Organo-metallic compounds, i.e. organic compounds containing a metal-to-carbon bond
• CPC Class Codes: C08L 83/00 Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 83/04 Polysiloxanes

Abstract

Soft, creamy translucent and transparent gels suitable for use in cosmetic applications may be prepared by hydrosilylating an unsaturated MQ resin or its equivalent with an Si—H functional organopolysiloxane cross-linker having Si—H functionality along its polysiloxane backbone, in the presence of a low viscosity and preferably volatile organopolysiloxanes. The stable gels obtained may be converted to creamy gels of a wide range of consistency by simple shearing. Gel firmness can be maintained through addition of a catalyst inhibitor to the gel formulation.

Claims

1. A stable, creamy gel composition suitable for use in cosmetics, prepared by the process ofgelling a mixture comprising

a) from about 60 weight percent to about 95 percent of a low viscosity organopolysiloxane;

b) an effective gelling amount of the hydrosilylation product of

b)i an unsaturated organopolysiloxane resin, and

b)ii an Si—

H functional, non-resinous organopolysiloxane bearing Si—

H functionality along the polysiloxane backbone;

said hydrosilylation optionally promoted by an effective amount of a hydrosilylation catalyst,

2) shearing said gel to form a creamy gel resistant to separation;

wherein all percents are percent by weight relative to the total gel composition.

2. The creamy gel composition of claim 1, wherein said unsaturated organopolysiloxane resin is a vinyl-functional MQ resin.

3. The composition of claim 1 wherein said low viscosity organopolysiloxane comprises a linear or branched organopolysiloxane having from 2 to about 10 silicon atoms, or a cyclic organopolysiloxane having from 3 to about 6 silicon atoms.

4. The composition of claim 3 wherein the repeating siloxane moieties of said low viscosity organopolysiloxane comprise dimethylsiloxy groups.

5. The composition of claim 1 wherein said Si—

H functional organopolysiloxane is a poly(methylhydrogen)(dimethyl)siloxane.

6. The composition of claim 1 wherein said low viscosity organopolysiloxane is present in an amount of 75% to 90%;

said unsaturated organopolysiloxane is present in an amount of about 5% to about 25%, and said Si—

H functional crosslinker is present in an amount of about 1-8%.

7. The composition of claim 1 wherein said low viscosity organopolysiloxane is present in an amount of 80% to 90%;

said unsaturated organopolysiloxane is present in an amount of about 10% to about 20%, and said Si—

H functional crosslinker is present in an amount of about 1-5%.

8. The composition of claim 1, wherein prior to shearing, additional low viscosity organopolysiloxane is added.

9. The composition of claim 1, further comprising an amount of hydrosilylation catalyst inhibitor effective to decrease changes in said creamy gel softness upon storage as compared to a similar gel prepared without said inhibitor.

10. The composition of claim 9, wherein said inhibitor is a mercaptoalkyl-functional siloxane.

11. The composition of claim 10, wherein said inhibitor is a mercaptoalkyl-functional silsesquisiloxane or mercaptoalkyl-fuctionalized low viscosity polyorganosiloxane oil.

16. A cosmetic preparation comprising the creamy gel of claim 1 and cosmetically acceptable ingredients.

17. The cosmetic preparation of claim 16, wherein said preparation is one selected from antiperspirants, deodorants, sun care, after sun care, moisturizers, face creams, hand creams, skin lotions, facial powder, eye shadow, liquid foundation, liquid-to-powder foundations, lipsticks, hair conditioners, and volume enhancers.

12. A process for the preparation of a creamy gel suitable for cosmetic applications, said process comprising:

a) providing a composition comprising

a)i a low viscosity organopolysiloxane

a)ii an unsaturated organopolysiloxane resin

a)iii an Si—

H functional organopolysiloxane bearing Si—

H functionality along the polysiloxane backbone;

b) hydrosilylating a)ii with a)iii to form a gel;

c) shearing said gel to form a creamy gel.

13. The process of claim 12, further comprising

a)iv an effective hydrosilylating promoting amount of a hydrosilylation catalyst.

14. The process of claim 13 further comprising adding an amount of a hydrosilylation catalyst inhibitor effective to decrease change in softness of said creamy gel upon storage as compared to a similar gel prepared without said inhibitor.

15. The process of claim 14 wherein said inhibitor is added during or following step b).

18. A process for decreasing the change in softness of creamy organopolysiloxane gels containing in excess of 60 weight percent low viscosity organopolysiloxane and a gelation composition prepared by hydrosilylating an unsaturated hydrocarbon or unsaturated hydrocarbon-functional organopolysiloxane with an Si—

H functional organopolysiloxane in the presence of a hydrosilylation catalyst, said process comprising adding an amount of a hydrosilylation catalyst inhibitor effective to decrease change in softness of said creamy gel upon storage as compared to a similar gel prepared without said inhibitor.

19. The process of claim 18, wherein said hydrosilylation catalyst inhibitor is an organic sulfur compound.

20. The process of claim 18, wherein said inhibitor comprises a mercaptoalkyl-functional organopolysiloxane.

21. The process of claim 18, wherein said inhibitor comprises a mercaptopropyl silsesquisiloxane.