Back to results
US 5,292,503 AGranted
Stable water in oil emulsions
AssigneeGeneral Electric Company
InventorsWilliam J. Raleigh, Raymond J. Thimineur
Life of this patent
Estimating the term…
Abstract
There is described water-in-oil emulsions containing polysiloxane surface active agents which can be formulated into lotions for use in sunscreens and skin care products.
Claims6
A lotion comprising:
- (a) from about 89.5 to about 40 parts by weight of an aqueous solution as a discontinuous phase;
- (b) from about 10 to about 45 parts by weight of a volatile liquid having a normal boiling point of less than 250.degree. C. as a continuous phase, said volatile liquid being selected from the group consisting of organosiloxane fluids having the average unit formula
- (CH.sub.3).sub.a SiO.sub.(4-a)/2 (I)
- (c) from about 0.1 to about 3 parts by weight of an organic oil-in-water surfactant having an HLB value of from 8 to 18 inclusive;
- and
- (d) from about 0.4 to about 20 parts by weight of a polyorganosiloxane polyoxyalkylene copolymer surface active agent of the formula
- MD.sub.x D'.sub.y M (II)
- wherein
- D is R.sub.2 SiO.sub.2/2 where R is hydrogen or methyl, ethyl, vinyl, phenyl, trifluoropropyl or unsubstituted hydrocarbon radical of from 1 to about 12 carbon atoms;
- D' is RR'SiO.sub.2/2 where R' is a polyalkylene ether of the formula
- --R.sup.3.sub.a --(OR.sup.2).sub.n --OR.sup.4 (III)
- where R.sup.2 is a --CH.sub.2 --CH.sub.2 --group, R.sup.3 is unsubstituted alkylene group of 1 to 20 atoms, R.sup.4 is the same as R, n has a value of from 5 to about 20, and a is 0 or 1;
- M is trimethylsiloxy endcapping units;
- x is from about 335 to about 475;
- and
- y is from about 4 to about 23;
- with the proviso that the molecular weight of polysiloxane units D is from about 25,000 to about 35,000 and the weight ratio of D to D' is from greater than 60/40 to 90/10.
14 more elements
Dependencies are inferred from the claim text.