Patent ID: 6706836
Filing Date: 2004-03-16
Classification: A61K,A61Q,B41M,C08F,C09J,Y02P,Y10T

Abstract:
A method of preparing a substantially gel free, hydrophilic, water soluble polymer substantially in the absence of a chain transfer agent, said polymer comprising a copolymer of 2-hydroxyethyl methacrylate and acrylic acid or methacrylic acid including:introducing monomeric 2-hydroxyethyl methacrylate containing at least 0.05% by weight of ethylene glycol dimethacrylate and at least one of acrylic acid and methacrylic acid into water solution, adjusting the pH of the solution to a pH in the range of greater than about pH 3 to less than about pH 9, and copolymerizing the monomeric 2-hydroxyethyl methacrylate and acrylic acid or methacrylic acid to form a polymerization mixture.