Patent · US Active

Method of producing water-soluble nonturbid copolymers of at least one water-soluble N-vinyllactam and at least one hydrophobic comonomer

US7572870B2 · kind B2 · utility

0Cited by

17References

16Claims

0Family size

Assignee

BASF SE

Inventors

Rainer Dobrawa · Stuttgart, DE
Ralf Widmaier · Mannheim, DE
Eberhard Schupp · Schwetzingen, DE
Klaus Schnell · Neustadt, DE

Key dates

Filing date	Dec 21, 2006
Grant date	Aug 11, 2009
Priority date	—
Expiry date	Dec 21, 2026

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08F218/08
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

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 following conversion of 90 to 99% by weight of the vinyllactam used, some of the solvent is distilled off and the polymerization is continued.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.