Patent ID: 6653427
Filing Date: 2003-11-25
Classification: A61K,A61Q,B41M,C08F,Y02P

Abstract:
A method for the preparation of gel-free copolymer of 2-hydroxyethyl methacrylate and 4-hydroxybutyl acrylate substantially in the absence of a chain transfer agent comprising:introducing monomeric 2-hydroxyethyl methacrylate containing ethylene glycol dimethacrylate impurities in the range of about 0.05 to 0.1% by weight with monomeric 4-hydroxybutyl acrylate into a solution of water and alcohol; and copolymerizing the 2-hydroxyethyl methacrylate and 4-hydroxybutyl acrylate to form a polymerization mixture.