Patent ID: 6177068
Filing Date: 2001-01-23
Classification: A61K,A61Q,C08F

Abstract:
The process for producing the cosmetically, controlled-release active emulsion of a crosslinked N-vinyl amide polymer which comprises:(a) precharging into a reactor under an inert gas atmosphere and anhydrous conditions, at a temperature of between about 45.degree. C. and about 150.degree. C. an oil solvent in an amount sufficient to maintain the subsequent reaction mixture in the liquid state,(b) adding thereto an effective polymerization promoting amount of a free radical initiator,(c) gradually adding over a period of from about 0.5 to about 8 hours with constant agitation, between about 5 and about 70 wt. % N-vinylamide monomer and between about 0.1 and about 2.5 wt. %, based on monomer, of a polyfunctional crosslinking agent for said N-vinylamide monomer and initiating the polymerization of said monomer,(d) continuing said polymerization until not more than 1% of unreacted monomer remains in the reaction mixture,(e) adding water to (d) in an oil to water volume ratio concentration of between about 10:90 and about 90:10 under agitation sufficient to homogenize the aqueous mixture and form a stable emulsion and(f) adding an effective hair or skin enhancing amount of said cosmetically active agent, optionally in the presence of a surfactant, to the aqueous mixture under constant agitation until a uniformly distributed composition is obtained.