Mixtures of silicone elastomers

• US 6,221,979 B1
• Filed: 11/08/1999
• Issued: 04/24/2001
• Est. Priority Date: 11/08/1999
• Status: Expired due to Term

• Current Assignee: Dow, Inc.
• Original Assignee: Dow, Inc.
• Inventors: Lin, Zuchen, Schulz, William James Jr., Smith, Janet Mary
• Primary Examiner(s): Dawson, Robert
• Assistant Examiner(s): Zimmer, Marc S.
• Application Number:
  US09/435,044
• Time in Patent Office: 533 Days
• Field of Search: 525/477, 524/588, 516/23, 516/903, 516/906, 528/15
• US Class Current: 525/477
• CPC Class Codes: A61K 8/06 Emulsions
• CPC Class Codes: A61K 8/064 Water-in-oil emulsions, e.g. Water-in-silicone emulsions
• CPC Class Codes: A61K 8/891 saturated, e.g. dimethicone, phenyl trimethicone, C24-C28 methicone or stearyl dimethicone
• CPC Class Codes: A61K 8/894 modified by a polyoxyalkylene group, e.g. cetyl dimethicone copolyol
• CPC Class Codes: A61K 8/92 Oils, fats or waxes; Derivatives thereof, e.g. hydrogenation products thereof
• CPC Class Codes: A61K 8/922 of vegetable origin
• CPC Class Codes: A61Q 19/00 Preparations for care of the skin
• CPC Class Codes: A61Q 5/00 Preparations for care of the hair
• CPC Class Codes: C08G 77/12 containing silicon bound to hydrogen C08G77/045 takes precedence
• CPC Class Codes: C08G 77/14 containing silicon bound to oxygen-containing groups C08G77/045 takes precedence
• CPC Class Codes: C08G 77/46 containing polyether sequences
• CPC Class Codes: C08G 77/70 Siloxanes defined by use of the MDTQ nomenclature
• 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: C08L 83/12 containing polyether sequences
• CPC Class Codes: Y10S 516/903 Two or more gellants
• CPC Class Codes: Y10S 516/906 The agent contains organic compound containing silicon

Abstract

A new composition of matter is a blend of (i) a crosslinked elastomeric silicone polyether and (ii) a crosslinked elastomeric silicone containing alkyl groups having 3-40 carbon atoms. The new composition can be used in preparing water-in-oil emulsions, and clear solutions containing an oil(s) or an oil-soluble active ingredient(s).

Claims

1. A composition of matter comprising a blend of (i) a crosslinked elastomeric silicone polyether, and (ii) a crosslinked elastomeric silicone containing alkyl groups having 16 to 30 carbon atoms, the crosslinked elastomeric silicone polyether and the crosslinked elastomeric silicone containing alkyl groups having 3-40 carbon atoms being present in the blend in a weight ratio of 4:

1 to 1;

8.

2. A composition according to claim 1 in which the crosslinked elastomeric silicone (i) and the crosslinked elastomeric silicone (ii) contain and are swollen with from 65 to 98 percent by weight of an oil.

3. A composition according to claim 2 in which the crosslinked elastomeric silicone (i) and the crosslinked elastomeric silicone (ii) each comprise polymeric molecules crosslinked to form gels consisting of three-dimensional molecular polymeric networks containing tens, hundreds, and thousands of crosslinking units between and among polymeric molecules.

4. A water-in-oil emulsion comprising an aqueous disperse phase and an oil continuous phase, the oil phase containing the composition defined in claim 1.

5. A water-in-oil emulsion according to claim 4 in which one or both of the aqueous phase contains a water soluble active ingredient, or the oil phase contains an oil or an oil soluble active ingredient.

6. A water-in-oil emulsion according to claim 5 in which the water soluble active ingredient in the aqueous phase is selected from the group consisting of water soluble Vitamins, water soluble drugs, and α

-hydroxy acids; and

the oil or oil soluble active ingredient in the oil phase is selected from the group consisting of volatile polydimethylsiloxanes, nonvolatile polydimethylsiloxanes, aliphatic hydrocarbons, aromatic hydrocarbons, alcohols, aldehydes, ketones, amines, esters, ethers, glycols, glycol ethers, alkyl halides, aromatic halides, flavoring agents, fragrances, oil soluble Vitamins, oil soluble drugs, and natural oils derived from animal, vegetable, and mineral sources.

7. A water-in-oil emulsion according to claim 6 in which the aqueous phase comprises 0.1 to 99 percent by weight of the emulsion including the weight of the water-soluble active ingredient, and the oil phase comprises 1 to 99.9 percent by weight of the emulsion including the weight of the composition defined in claim 1 and the oil or oil-soluble active ingredient.

8. A water-in-oil emulsion according to claim 7 in which the aqueous phase comprises 20 to 95 percent by weight of the emulsion, and the oil phase comprises 5 to 80 percent by weight of the emulsion.

9. A clear solution comprising the composition defined in claim 1 and an oil or oil soluble active ingredient.

10. A composition of matter comprising a blend of (i) a linear silicone polyether, and (ii) a crosslinked elastomeric silicone containing alkyl groups having 3-40 carbon atoms, the linear silicone polyether (i) and the alpha, omega-diene crosslinked elastomeric silicone (ii) being present in the blend in a weight ratio of 4:

1 to 1;

8.

11. A composition according to claim 10 in which the linear silicone polyether (i) has the formula:

where R^a is an alkyl group of one to six carbon atoms;

R^b is the radical —

C_mH_2m—

;

R^c is a terminating radical selected from the group consisting of hydrogen, an alkyl group of one to six carbon atoms, or an aryl group;

m has a value of two to eight;

p and s have values such that the oxyalkylene segment —

(C₂H₄O)_p—

(C₃H₆O)_s—

has a molecular weight in the range of 400 to 5,000;

the segment having 50-99 mole percent of oxyethylene units —

(C₂H₄O)_p— and

1-50 mole percent of oxypropylene units —

(C₃H₆O)_s—

;

x has a value of 10 to 500; and

y has a value of 2 to 100.

12. A composition according to claim 10 in which the crosslinked elastomeric silicone (ii) contains and is swollen with from 65 to 98 percent by weight of an oil.

13. A composition according to claim 10 in which the crosslinked elastomeric silicone (ii) comprises polymeric molecules which are crosslinked together to form a gel consisting of a three-dimensional molecular polymeric network containing tens, hundreds, and thousands of crosslinking units between and among the polymeric molecules.

14. A water-in-oil emulsion comprising an aqueous disperse phase and an oil continuous phase, the oil phase containing the composition defined in claim 10.

15. A water-in-oil emulsion according to claim 14 in which one or both of the aqueous phase contains a water soluble active ingredient, or the oil phase contains an oil or an oil soluble active ingredient.

16. A water-in-oil emulsion according to claim 15 in which the water soluble active ingredient in the aqueous phase is selected from the group consisting of water soluble Vitamins, water soluble drugs, and α

-hydroxy acids; and

the oil or oil soluble active ingredient in the oil phase is selected from the group consisting of volatile polydimethylsiloxanes, nonvolatile polydimethylsiloxanes, aliphatic hydrocarbons, aromatic hydrocarbons, alcohols, aldehydes, ketones, amines, esters, ethers, glycols, glycol ethers, alkyl halides, aromatic halides, flavoring agents, fragrances, oil soluble Vitamins, oil soluble drugs, and natural oils derived from animal, vegetable, and mineral sources.

17. A water-in-oil emulsion according to claim 16 in which the aqueous phase comprises 0.1 to 99 percent by weight of the emulsion including the weight of the water-soluble active ingredient, and the oil phase comprises 1 to 99.9 percent by weight of the emulsion including the weight of the composition defined in claim 11 and the oil or oil-soluble active ingredient.

18. A water-in-oil emulsion according to claim 17 in which the aqueous phase comprises 20 to 95 percent by weight of the emulsion, and the oil phase comprises 5 to 80 percent by weight of the emulsion.