Silicone compositions comprising a swollen silicone gel

Patent metadata

Field	Value
Publication number	US-9243113-B2
Application number	US-201013503637-A
Country	US
Kind code	B2
Filing date	Oct 19, 2010
Priority date	Oct 23, 2009
Publication date	Jan 26, 2016
Grant date	Jan 26, 2016

Abstract

In various embodiments, provided are substantially homogenous swollen silicone gels, powders, pastes, and compositions thereof; methods of preparing the same; and personal care and healthcare products comprising the same.

First claim

The invention claimed is:

1. A method for the preparation of a silicone composition, the method comprising:
combining
Component (A), at least one organopolysiloxane having an average of at least two free radical polymerizable groups per molecule, the organopolysiloxane having the structure:
R 1 3 SiO(R 1 2 SiO) a (R 1 R 2 SiO) b SiR 1 3 or R 3 2 R 4 SiO(R 3 2 SiO) c (R 3 R 4 SiO) d SiR 3 2 R 4 ,

wherein
at each occurrence R 1 and R 3 are independently chosen from halogen and a monovalent organic group,
at each occurrence R 2 and R 4 are independently a monovalent unsaturated organic group,
a, c, and d are independently about 0 to about 20,000, and b is about 1 to about 20,000,

Component (B), at least one organoborane free radical initiator, and
Component (C), at least one fluid miscible with Component (A), to form a reaction mixture, wherein Component (B) is the only catalyst present in the reaction mixture; and

gelling the reaction mixture to form a substantially homogeneous swollen silicone gel, the gelling comprising
polymerizing Component (A) in the presence of Component (B), Component (C), and oxygen, while maintaining a temperature of from about 5° C. to about 95° C., to form the substantially homogeneous swollen silicone gel, wherein about 50 wt % to about 90 wt % of the substantially homogeneously swollen silicone gel is Component (C).

2. The method according to claim 1 , wherein the polymerizing comprises maintaining the temperature at from about 10° C. to about 35° C. and wherein the swollen silicone gel has a plateau elastic shear modulus not greater than one half of an intrinsic plateau elastic shear modulus of an elastomer component of the swollen silicone gel in an undiluted state.

3. The method according to claim 2 , comprising shearing the swollen silicone gel and optionally diluting it with at least one miscible fluid that is compatible with the elastomer component and Component (C) to form a silicone paste comprising swollen silicone microparticles; wherein the optional miscible fluid is the same as Component (C), different from Component (C), and any combination thereof.

4. The method according to claim 3 , further including diluting the swollen silicone gel with at least one miscible fluid, the at least one miscible fluid being selected from silicones.

5. The method according to claim 1 , wherein Component (A) is selected from acrylate and methacrylate-functional polydimethylsiloxanes and resins.

6. The method according to claim 1 , wherein Component (B) is a trialkylborane-organonitrogen complex wherein the trialkylborane is selected from triethylborane, tri-n-butylborane, tri-n-octylborane, tri-sec-butylborane, tridodecylborane, and any combination thereof.

7. The method according to claim 1 , wherein polymerization occurs in the presence of Component (D), at least one organonitrogen-reactive compound selected from isophorone diisocyanate, acetic acid, carboxyl-terminated polydimethylsiloxane, and any combination thereof.

8. The method according to claim 1 , wherein polymerization occurs in the presence of Component (E), at least one free-radical polymerizable organic co-monomers selected from acrylates, methacrylates, and any combination thereof.

9. The method according to claim 1 , wherein polymerization occurs in the presence of, or the silicone gel formed is treated with Component (F), at least one active ingredient suitable for use in personal care and healthcare products.

10. The method according to claim 3 , further including diluting the swollen silicone gel with at least one miscible fluid, the at least one miscible fluid being selected from linear and cyclosiloxanes, and combinations thereof.

11. The method according to claim 10 , wherein the at least one miscible fluid is a cyclosiloxane, the cyclosiloxane being decamethylcyclopentasiloxane.

12. The method according to claim 3 , further including diluting the swollen silicone gel with at least one miscible fluid, the at least one miscible fluid being an organic solvent or a combination thereof.

13. The method according to claim 3 , further including diluting the swollen silicone gel with at least one miscible fluid, the at least one miscible fluid being an ester or a combination thereof.

14. The method according to claim 5 , wherein Component (A) is selected from methacryloxypropyldimethylsiloxy-terminated polydimethylsiloxane, methacryloxymethylsiloxy-terminated polydimethylsiloxanes, acryloxypropyldimethylsiloxy-terminated polydimethylsiloxanes, acryloxymethyldimethylsiloxy-terminated polydimethylsiloxanes, polydimethylsiloxane-polymethyl-methacryloxypropylsiloxane copolymers, polydimethylsiloxane-polymethyl-acryloxypropylsiloxane copolymers, and any combination thereof.

Assignees

• Ahn Dongchan
• Schulz William
• Thompson James
• Dow Corning

Inventors

• Ahn Dongchan
• Schulz William
• Thompson James

Classifications

• C08L83/10

  Block- or graft-copolymers containing polysiloxane sequences (obtained by polymerising a compound having a carbon-to-carbon double bond on to a polysiloxane C08L51/08, C08L53/00) · CPC title

• A61K8/042

  Gels · CPC title

• A61Q15/00

  Anti-perspirants or body deodorants (deodorisation of air A61L9/00) · CPC title

• C08G77/442 Primary

  containing vinyl polymer sequences · CPC title

• A61K8/893

  modified by an alkoxy or aryloxy group, e.g. behenoxy dimethicone or stearoxy dimethicone · CPC title