Process for the preparation of aqueous polymer dispersions from a aromatic compound, a conjugated aliphatic diene and an ethylenically unsaturated carbonitrile

US8530563B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Elitsa Evstatieva · Mannheim, DE
• Juergen Schmidt-Thuemmes · Schifferstadt, DE
• Dirk Lawrenz · Ludwigshafen am Rhein, DE

Key dates

• Filing date: Jun 25, 2012
• Grant date: Sep 10, 2013
• Expiry date: Jun 25, 2032

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31906
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for the preparation of aqueous polymer dispersions is described, a vinylaromatic compound, such as, for example, styrene, a conjugated aliphatic diene, such as, for example, butadiene, and an ethylenically unsaturated carbonitrile, such as, for example, acrylonitrile, being copolymerized in an aqueous medium. The copolymerization is effected in the presence of a degraded starch and of free radical initiators. At least part of the monomers differing from ethylenically unsaturated carbonitriles are polymerized before the ethylenically unsaturated carbonitriles are added to the polymerization mixture.