Patent ID: 7442751
Filing Date: 2008-10-28
Classification: C08F

Abstract:
1. A method of producing vinyllactam copolyrners, the method comprising: (a) providing at least one water-soluble N-vinyllactam and at least one hydrophobic comonomer; and (b) free-radical polymerizing the at least one water-soluble N-vinyllactam and the at least one hydrophobic comonomer at a temperature of 60 to 150° C. in an organic solvent in the presence of an initiator under reflux conditions such that a reflux comprising a condensing gaseous mixture of the organic solvent and the at least one hydrophobic comonomer is present, wherein at least a portion of the at least one water-soluble N-vinyllactam is added to the condensing gaseous mixture.