Process for making a cosmetically or pharmaceutically-acceptable emulsion or gel composition
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United States of America Patent
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Oct 9, 2001
Issued Date -
N/A
app pub date -
Mar 13, 1999
filing date -
Dec 10, 1997
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Abstract
A process of making a cosmetically or pharmaceutically-acceptable emulsion or gel composition which comprises: (a) heating a reaction mixture comprising, by weight, about 5-70% of a vinyl monomer in about 30-95% of an oil as solvent, wherein said oil is selected from the group consisting of a silicone oil, a mineral oil and a water-insoluble organic ester and a free radical initiator, optionally in the presence of a crosslinking agent and/or an oil soluble surfactant, with agitation, under an inert gas, at about 40-150.degree. C., wherein the oil is present in an amount sufficient to keep the resultant vinyl polymer in a stirrable state until the end of the polymerization, (b) adding a surfactant, if a suitable surfactant was not present during polymerization, and, (c) then adding water to form an oil-in-water, a water-in-oil or a water-in-oil-in-water emulsion or gel, in a volume ratio of oil-in-water of 30:70 to 10:90, or water-in-oil of 90:10 to 30:70.
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