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US 6,616,934 B1Granted
Clear silicone microemulsions
AssigneeDow Corning Corporation
InventorsRandal Myron Hill, Zuchen Lin
Life of this patent
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Abstract
Spontaneously formed highly stable clear water-in-oil microemulsions containing only small amounts of water can be prepared by combining and simply hand shaking (i) 0.1 to 9 percent by weight of water; (ii) greater than 80 percent by weight of a volatile cyclic alkyl siloxane or volatile linear alkyl siloxane; and (iii) 3 to 10 percent by weight of certain silicone polyether surfactants. The microemulsions are useful in personal care applications.
Claims6
A water-in-oil microemulsion comprising (i) 0.1 to 9 percent by weight of water;
- (ii) greater than 80 percent by weight of a cyclic alkyl siloxane oil having the formula (R2SiO)p or a linear alkyl siloxane oil having the formula R3SiO(R2SiO)qSiR3 in which R is an alkyl group containing 1-6 carbon atoms, p is 3-6, and q is 0-5;
- and (iii) 3 to 10 percent by weight of a silicone polyether having a formula selected from the group consisting of
- where R1 represents an alkyl group containing 1-6 carbon atoms;
- R2 represents the radical —(CH2(aO(C2H4O)b(C3H6O)cR3;
- x has a value of 0-3;
- y has a value of 1-3;
- z has a value of 0-2;
- m has a value of 3-5;
- n is one;
- a has a value of 0-6;
- b has a value of 2-6;
- c has a value of 0-3;
- and R3 is hydrogen, a methyl radical, or an acyl radical;
- the water-in-oil microemulsion containing domains of oil or water having an average diameter of less than 100 nanometer (0.1 micron/1,000 angstrom Å).
11 more elements
Dependencies are inferred from the claim text.