Patent · US Expired

Preparation of polyvinylpyrrolidone

US4786699A · kind A · utility

14Cited by

2References

3Claims

0Family size

Assignee

BASF SE

Inventors

Adolf Nuber · Böhl-Iggelheim, DE
Siegfried Lang · Ludwigshafen, DE
Axel Sanner · Bischofswerda, DE
Gerd Schroeder · Schifferstadt, DE

Key dates

Filing date	Jan 19, 1988
Grant date	Nov 22, 1988
Priority date	—
Expiry date	Jan 19, 2008

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08F26/10
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

Polyvinylpyrrolidone having a Fikentscher K value of from 14 to 95 is prepared at from 50.degree. to 95.degree. C. in aqueous solution with hydrogen peroxide as starter, the solution being maintained at pH 7-11 by means of NaOH, KOH, their carbonates or bicarbonates.

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