Preparation of aqueous polymer dispersions of low viscosity with polymer volume concentrations of at least 50%

US6028135A · kind A · utility

Assignee

• BASF SE

Inventors

• Peter Keller · Bruchmühlbach-Miesau, DE
• Bernhard Schuler · Austin, US
• Bernd Stanger · Dudenhofen, DE

Key dates

• Filing date: Jun 17, 1997
• Grant date: Feb 22, 2000
• Expiry date: Jun 17, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09J151/003
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A process for the preparation of aqueous polymer dispersions of low viscosity with polymer volume concentrations of at least 50% by volume, based on the polymer dispersion, by free-radical emulsion polymerization of ethylenically unsaturated monomers, with the exception of vinyl halides and vinylidene halides, in the presence of at least one initiator and at least one initial polymer involves emulsifying the major proportion of the monomers in an aqueous dispersion of the initial polymer and supplying this emulsion continuously to the polymerization reaction.