Preparation of low molecular mass homopolymers of N-vinylpyrrolidone

US6187884A · kind A · utility

Assignee

• BASF SE

Inventors

• Stephan Kothrade · Schifferstadt, DE
• Rainer Blankenburg · Kornwestheim, DE
• Iris Peters · Lambsheim, DE
• Axel Sanner · Bischofswerda, DE

Key dates

• Filing date: Jun 25, 1998
• Grant date: Feb 13, 2001
• Expiry date: Jun 25, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F126/10
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for preparing highly concentrated aqueous solutions of low molecular mass homopolymers of N-vinylpyrrolidone by free-radical solution polymerization in an aqueous medium with H.sub.2 O.sub.2 as initiator comprises carrying out the polymerization in the presence of from 0.1 to 30% by weight, based on N-vinylpyrrolidone, of a polymerization regulator which is selected from the group consisting of C.sub.1 -C.sub.6 -alkanols, hydroxylamine salts and water-soluble compounds containing sulfur in bonded form.