Method for reducing residual monomers in liquid systems by adding an oxidation-reduction initiator system

US6462138B1 · kind B1 · utility

Assignee

• BASF SE

Inventors

• Robert Rupaner · Ludwigshafen, DE
• Sven Lawrenz · Mannheim, DE
• Johannes Dobbelaar · Monsheim, DE
• Gerhard Bauer · Düsseldorf, DE
• Franz-Josef Mueseler · Neustadt, DE
• Werner Kirchner · Neustadt, DE
• Bradley Ronald Morrison · Mannheim, DE
• Jurgen Nahstoll · Eisenberg, DE
• Martin Meister · Bocholt, DE
• Reinhard Bacher · Bad Dürkheim, DE
• Wolfgang Hubinger · Schifferstadt, DE
• Gerhard Schumacher · Heidelberg, DE

Key dates

• Filing date: Mar 15, 2000
• Grant date: Oct 8, 2002
• Expiry date: Mar 15, 2020

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S526/919
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process is described for reducing the residual monomer content in a liquid solution, mixture, melt, suspension or dispersion of a polymer by postpolymerization with addition of a redox initiator system at a reaction temperature appropriate to it and with an extremely short mixing time of the liquid system in the production reactor by metering—gradually, in portions or continuously—at least one of the redox initiator components required to initiate polymerization of the residual monomers over a period (metering time) which is from about 10 to 250 times the mixing time of the liquid system in said reactor.