Clear silicone microemulsions
First Claim
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1. 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
).
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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.
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Citations
6 Claims
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1. 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 ofwhere 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
).- View Dependent Claims (2, 3, 4, 5, 6)
- (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
Specification