Emulsions of silicone elastomer and silicone organic elastomer gels

• US 8,236,890 B2
• Filed: 09/18/2008
• Issued: 08/07/2012
• Est. Priority Date: 09/25/2007
• Status: Expired due to Fees

• Current Assignee: Dow, Inc.
• Original Assignee: Dow, Inc.
• Inventors: Lin, Shaow Burn, Humphrey, Jason
• Primary Examiner(s): MOORE, MARGARET G
• Application Number:
  US12/680,061
• Publication Number:
  US 20100209367A1
• Time in Patent Office: 1,419 Days
• Field of Search: 524/588, 424/401
• US Class Current: 524/588
• CPC Class Codes: A61K 8/042 Gels
• CPC Class Codes: A61K 8/06 Emulsions
• CPC Class Codes: A61K 8/895 containing silicon bound to unsaturated aliphatic groups, e.g. vinyl dimethicone
• CPC Class Codes: A61Q 17/04 Topical preparations for affording protection against sunlight or other radiation; Topical sun tanning preparations
• CPC Class Codes: A61Q 19/00 Preparations for care of the skin
• 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
• CPC Class Codes: C09D 183/04 Polysiloxanes

Abstract

Aqueous emulsions are disclosed of a gel or gel paste containing a silicone elastomer from the reaction an organohydrogensiloxane having at least two SiH containing cyclosiloxane rings in its molecule and a compound having at least two aliphatic unsaturated groups in its molecule.

Claims

1. An aqueous emulsion composition comprising:

i) a gel having a compression hardness of at least 200 Newton/m² containing a silicone organic elastomer from the reaction of;

A) an organohydrogensiloxane prepared by a hydrosilylation reaction of;

a) an organohydrogencyclosiloxane having the formula [(CH₃)HSiO]_g where g is 3-8 and,

B) a compound or mixture of compounds having at least two aliphatic unsaturated hydrocarbon groups in its molecule selected from a vinyl functional or hexenyl functional polydimethylsiloxane having the average formula;

CH₂═

CH(Me)₂SiO[Me₂SiO]_xSi(Me)₂CH═

CH₂

CH₂═

CH—

(CH₂)₄(Me)₂SiO[Me₂SiO]_xSi(Me)₂-(CH₂)₄—

CH═

CH₂,

or

Me₃SiO[(Me)₂SiO]_x[CH₂═

CH(Me)SiO]_ySiMe₃,

wherein Me is methyl, x≧

0 and y≧

2, and

wherein the molar ratio of SiH units to unsaturated group ranges from 2/1 to 8/1,

B³) a polyether compound or mixture of polyether compounds having the formula R²—

Y—

R² where R² is a monovalent unsaturated aliphatic group and Y is a polyoxyalkylene group having the formula —

[(C₂H₄O)_c(C₃H₆O)_d(C₄H₈O)_e]—

where c, d, and e and may each independently range from 0 to 200, providing the sum of c+d+e is greater than 2 and

C) a hydrosilylation catalyst,

D) fluid, and

ii) an emulsifier.

2. The emulsion of claim 1 further comprising;

E) personal or healthcare active.

3. The emulsion of claim 1 wherein the emulsion is an oil/water emulsion having an internal oil phase comprising i) the gel and a continuous aqueous phase.

4. The emulsion of claim 3 wherein the emulsion contains;

5 to 90 weight percent of the internal oil phase,

0.5 to 20 weight percent of the emulsifier,

and sufficient water to sum to 100 weight percent.

5. A process for preparing an aqueous emulsion comprising:

I) mixing

i) a gel having a compression hardness of at least 200 Newton/m² containing a silicone organic elastomer from the reaction of;

A) an organohydrogensiloxane prepared by a hydrosilylation reaction of;

a) an organohydrogencyclosiloxane having the formula [(CH₃)HSiO]_g where g is 3-8 and,

B) a compound or mixture of compounds having at least two aliphatic unsaturated hydrocarbon groups in its molecule selected from a vinyl functional or hexenyl functional polydimethylsiloxane having the average formula;

CH₂═

CH(Me)₂SiO[Me₂SiO]_xSi(Me)₂CH═

CH₂

CH₂═

CH—

(CH₂)₄(Me)₂SiO[Me₂SiO]_xSi(Me)₂-(CH₂)₄—

CH═

CH₂,

or

Me₃SiO[(Me)₂SiO]_x[CH₂═

CH(Me)SiO]_ySiMe₃,

wherein Me is methyl, x≧

0 and y≧

2, and

wherein the molar ratio of SiH units to unsaturated group ranges from 2/1 to 8/1,

B³) a polyether compound or mixture of polyether compounds having the formula R²—

Y—

R² where R² is a monovalent unsaturated aliphatic group and Y is a polyoxyalkylene group having the formula —

[(C₂H₄O)_c(C₃H₆O)_d(C₄H₈O)_e]—

where c, d, and e may each independently range from 0 to 200, providing the sum of c+d+e is greater than 2

C) a hydrosilylation catalyst, and

D) carrier fluid,

E) an optional personal or healthcare active, and

ii) an emulsifier,

II) admixing incremental amounts of water to the mixture of step I to form a water continuous emulsion,

III) optionally, shear mixing the water continuous emulsion.

6. The aqueous emulsion prepared according to the method of claim 5.