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US 7,442,751 B2Granted
Method of producing water-soluble nonturbid copolymers of at least one water-soluble N-vinyllactam and at least one hydrophobic comonomer
AssigneeBASF SE
InventorsRainer Dobrawa, Ralf Widmaier, Eberhard Schupp, Klaus Schnell, Karl-Hermann Strube
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Abstract
Method of producing vinyllactam copolymers by free-radical polymerization of at least one water-soluble N-vinyllactam and at least one hydrophobic comonomer in an organic solvent in the presence of an initiator under reflux conditions, where N-vinyllactam is added to the reflux.
Claims11
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.
Dependencies are inferred from the claim text.