Patent · US Expired

Manufacture of insoluble and only sparingly swellable poly-N-vinylpyrrolidone-2 or copolymers of N-vinylpyrrolidone with other N-vinyllactams

US3933766A · kind A · utility

17Cited by

3References

3Claims

0Family size

Assignee

BASF SE

Inventors

Ernst Hofmann
Karl Herrle

Key dates

Filing date	Nov 9, 1973
Grant date	Jan 20, 1976
Priority date	—
Expiry date	Nov 9, 1993

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08F20/60
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

Manufacture of insoluble poly-N-vinyl-pyrrolidone-2 or copolymers of N-vinylpyrrolidone-2 in the presence of a difunctional crosslinker by heating the reaction solution at temperatures above 80.degree.C and completing the reaction at the boiling temperature of water.

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