Low molecular weight silicone oil-in-water emulsion
AssigneeDow Corning Corporation
InventorsQian Feng, Robin Hickerson, Michael Starch, Isabelle Van Reeth
Life of this patent
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Abstract
Oil in water emulsion compositions, and methods for preparing such emulsions, where the oil phase component of the emulsion contains at least 50 weight percent of a low molecular weight siloxane are disclosed. The oil in water emulsions are stabilized by a combination of a silicone polyether and anionic surfactant. The oil in water emulsions, and subsequently diluted emulsions therefrom, are stable with time and are useful in a variety of personal, medical, and household care formulations.
Claims16
An oil in water emulsion composition comprising:
- A) 20 to 80 weight % of an oil phase containing at least 50 weight % of a low molecular weight siloxane;
- B) a silicone polyether having the formula
- where R1 represents an alkyl group containing 1-6 carbon atoms;
- R2 represents the radical —(CH2)aO(C2H4O)b(C3H6O)cR3;
- x is 20-1,000;
- y is 2-500;
- z is 2-500;
- a is 3-6;
- b is 4-30;
- c is 0-30;
- and R3 is hydrogen, a methyl radical, or an acyl radical;
- C) an anionic surfactant;
- and
- D) water in a sufficient amount such that the sum of the weight percents of A), B), C), and D) equals 100 weight percent,
- wherein the oil phase is dispersed in the emulsion as particles having an average size of less than 5 micrometers.
A method for preparing an oil in water emulsion comprising:
- I) mixing;
- A′) a low molecular weight siloxane, and
- B) a silicone polyether having the formula
- where R1 represents an alkyl group containing 1-6 carbon atoms;
- R2 represents the radical —(CH2)aO(C2H4O)b(C3H6O)cR3;
- x is 20-1,000;
- y is 2-500;
- z is 2-500;
- a is 3-6;
- b is 4-30;
- c is 0-30;
- and R3 is hydrogen, a methyl radical, or an acyl radical;
- to form an oil phase wherein the oil phase contains at least 50% by weight of the low molecular weight siloxane, and
- II) adding the oil phase to an aqueous phase comprising;
- C) an anionic surfactant, and
- D) water,
- to form an oil in water emulsion,
- wherein the emulsion contains 20-80 weight percent of the oil phase.
Dependencies are inferred from the claim text.