Semi continuously operated method for producing copolymers

US8536252B2 · kind B2 · utility

Assignee

• CONSTRUCTION RESEARCH & TECHNOLOGY GMBH · DE

Inventors

• Gerhard Albrecht · Prien am Chiemsee, DE
• Helmut Mack · Ludwigshafen, DE
• Klaus Lorenz · Zangberg, DE
• Mario Vierle · Günzburg, DE
• Silke Flakus · Ebersberg, DE
• Petra Wagner · Trostberg, DE
• Christian Scholz · Neustadt an der Weinstraße, DE
• Harald Grassl · Feichten, DE
• Barbara Wimmer · Tacherting, DE

Key dates

• Filing date: Nov 25, 2009
• Grant date: Sep 17, 2013
• Expiry date: Nov 25, 2029

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F222/06
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for the preparation of a copolymer in semicontinuous operation in a polymerization apparatus, comprising a polymerization reactor connected to a metering device, acid monomer being initially taken in the metering device and polyether macromonomer, acid monomer and water in the polymerization reactor, acid monomer being metered from the metering device into the polymerization reactor, the metering of the acid monomer being effected with the proviso that at least 70 mol % of the acid monomer metered in altogether are metered in the course of 5 to 19 minutes at a metering rate that is constant or varies to a limited extent.