Aqueous silicone polyether microemulsions
AssigneeDow Corning Corporation
InventorsQian Jane Feng, Bethany K. Johnson, Yihan Liu
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Abstract
Silicone polyether microemulsions are disclosed containing i) at least 20% by weight of a water immiscible dispersed phase comprising certain polydialkylsiloxane-polyoxyalkylene copolymers having 0.1 to 10 wt % ethylene oxide (C2H4O) groups, optionally a water immiscible silicone or hydrocarbon fluid, and ii) at least 5% by weight of an emulsifier. The silicone polyether microemulsions are optically transparent and have an average particle size of less than 100 nanometers. They may be used in a variety of personal care product formulations. In particular, the silicone polyether microemulsions may be used to prepare “clear” personal care products.
Claims14
An aqueous silicone polyether microemulsion consisting of:
- i) at least 20% by weight of a water immiscible dispersed phase comprising:
- A) a polydialkylsiloxane-polyoxyalkylene copolymer having the average formula
- R13SiO[R12SiO]x[R1R2siO]ySiR13 or R12R2SiO[R12SiO]xSiR12R2
- wherein x ranges from 50 to 1000, y ranges from 1 to 50,
- R1 is an alkyl group containing 1 to 6 carbon atoms,
- R2 is a polyoxyalkylene group having the average formula
- —R3O(C2H4O)a(C3H6O)bR4 wherein
- a is greater than 4, b ranges from 0 to 10,
- R3 is a divalent hydrocarbon group containing 2 to 12 carbon atoms,
- R4 is hydrogen, R1, or an acetyl group,
- with the proviso that the polydialkylsiloxane-polyoxyalkylene copolymer
- contains 0.1 to 10 wt % ethylene oxide (C2H4O) groups,
- B) optionally, a water immiscible silicone or hydrocarbon fluid, and
- ii) at least 5% by weight of
- C) an emulsifier selected from an anionic surfactant, a cationic surfactant, a nonionic surfactant, or a combination thereof,
- wherein the silicone polyether microemulsion is optically transparent and has an average particle size of less than 100 nanometers.
Dependencies are inferred from the claim text.