Silicone elastomer composition

Patent metadata

Field	Value
Publication number	US-10500151-B2
Application number	US-201515327317-A
Country	US
Kind code	B2
Filing date	Apr 8, 2015
Priority date	Jul 23, 2014
Publication date	Dec 10, 2019
Grant date	Dec 10, 2019

Abstract

A silicone elastomer composition (“composition”) has customizable sensory characteristics. The composition includes a pituitous silicone fluid that includes a hydrosilylation reaction product and a carrier fluid. The hydrosilylation reaction product generally includes alkenyl or Si—H functionality. The hydrosilylation reaction product is the reaction product of a first linear organopolysiloxane including (R 1 R 2 R 3 SiO— 1/2 ) and (R 4 R 5 Si) 2/2 ) units, and a second linear organopolysiloxane including (R 6 R 7 R 8 SiO— 1/2 ) and (R 9 R 10 SiO 2/2 ) units. Each of R 1 -R 10 is independently a hydrocarbon group so long as at least one of R 1 -R 5 is an alkenyl group and at least one of R 6 -R 10 is a hydrogen atom. The first linear organopolysiloxane has a DP of from 100 to 15,000. The second linear organopolysiloxane has a DP of from 4 to 1,000. The composition also includes a silicone elastomer different from the hydrosilylation reaction product. Personal care compositions can include the composition.

First claim

What is claimed is:

1. A silicone elastomer composition having customizable sensory characteristics, said silicone elastomer composition comprising:
A) a pituitous silicone fluid comprising;
(1) a hydrosilylation reaction product of;
(a) a first linear organopolysiloxane comprising (R 1 R 2 R 3 SiO 1/2 ) and (R 4 R 5 SiO 2/2 ) units, wherein each of R 1 -R 5 is independently a hydrocarbon group so long as at least one of R 1 -R 5 is an alkenyl group, said first linear organopolysiloxane comprises less than 1 weight percent of T and Q units, and said first linear organopolysiloxane has a degree of polymerization of from 100 to 15,000 repeating (R 4 R 5 SiO 2/2 ) siloxy units, and
(b) a second linear organopolysiloxane comprising (R 6 R 7 R 8 SiO 1/2 ) and (R 9 R 10 SiO 2/2 ) units, wherein each of R 6 -R 10 is independently a hydrocarbon group, polyether group, siloxane group, or polyol group, so long as at least one of R 6 -R 10 is a hydrogen atom, said second linear organopolysiloxane comprises less than 1 weight percent of T and Q units, and said second linear organopolysiloxane has a degree of polymerization of from 4 to 1,000; and
(2) a carrier fluid chosen from a silicone fluid, an organic solvent, an organic oil, and combinations thereof;
wherein said hydrosilylation reaction product comprises alkenyl or Si-H functionality,
wherein said hydrosilylation reaction product is present in an amount of from 3 to 30 parts by weight per 100 parts by weight of said pituitous silicone fluid, and
wherein said pituitous silicone fluid exhibits an increasing normal stress observed in a perpendicular direction when a constantly increasing shear force is applied; and

B) a silicone elastomer different from said hydrosilylation reaction product;
wherein said silicone elastomer composition is formed by combining said hydrosilylation reaction product and said silicone elastomer after said hydrosilylation reaction product is formed.

2. The silicone elastomer composition of claim 1 , wherein said first linear organopolysiloxane is vinyl terminated.

3. The silicone elastomer composition of claim 1 , wherein said second linear organopolysiloxane has 2 to 10 pendant SiH sites.

4. The silicone elastomer composition of claim 1 , wherein said second linear organopolysiloxane is dimethyl, methylhydrogen siloxane, trimethylsiloxy terminated.

5. The silicone elastomer composition of claim 1 , wherein said hydrosilylation reaction product comprises vinyl functionality and a molar ratio of vinyl to Si-H of said first and second linear organopolysiloxanes, respectively, is greater than 1.

6. The silicone elastomer composition of claim 1 , wherein said hydrosilylation reaction product comprises Si-H functionality and a molar ratio of vinyl to Si-H of said first and second linear organopolysiloxanes, respectively, is less than 1.

7. The silicone elastomer composition of claim 1 , wherein said hydrosilylation reaction product is present in an amount of from 3 to 30 parts by weight per 100 parts by weight of said pituitous silicone fluid.

8. The silicone elastomer composition of claim 1 , wherein said carrier fluid is a silicone fluid.

9. The silicone elastomer composition of claim 1 , wherein a plot of normal stress versus shear rate falls above a limit line on a graph and the limit line is created using the equation y=3.6x, where y is the normal stress and x is the shear rate.

10. The silicone elastomer composition of claim 1 , wherein said silicone elastomer is a reaction product of an SiH containing polysiloxane and an α,ω-diene.

11. A personal care composition comprising a personal care additive and the silicone elastomer composition of claim 1 .

12. A method of forming the silicone elastomer composition according to claim 1 , said method comprising: reacting the first linear organopolysiloxane (a) and the second linear organopolysiloxane (b) via a hydrosilylation reaction in the presence of a hydrosilylation catalyst and the carrier fluid (2) to form the hydrosilylation reaction product (1); and combining the hydrosilylation reaction product (1) with the silicone elastomer B) to form the silicone elastomer composition.

13. The method of claim 12 , wherein the second linear organopolysiloxane comprises the reaction product of a first species of the second linear organopolysiloxane and a compound having a mono terminal aliphatic unsaturated hydrocarbon group.

14. The method of claim 12 , wherein:
i) the first linear organopolysiloxane is vinyl terminated; and/or
ii) the second linear organopolysiloxane has 2 to 10 pendant SiH sites.

15. The silicone elastomer composition of claim 2 , wherein said first linear organopolysiloxane is dimethylvinyl terminated.

16. The silicone elastomer composition of claim 3 , wherein said second linear organopolysiloxane has 6 pendant SiH sites.

17. The silicone elastomer composition of claim 8 , wherein said carrier fluid is a polydimethylsiloxane.

Assignees

• Dow Corning
• Dow Silicones Corp

Inventors

• Fryfogle Patrick J
• Kadlec Donald Anthony

Classifications

• C08L83/04 Primary

  Polysiloxanes · CPC title

• C08G77/20

  containing silicon bound to unsaturated aliphatic groups · CPC title

• A61K8/895 Primary

  containing silicon bound to unsaturated aliphatic groups, e.g. vinyl dimethicone · CPC title

• A61Q19/00

  Preparations for care of the skin · CPC title

• C08G77/46

  containing polyether sequences · CPC title