Preparing coarse polymer dispersions

US6080803A · kind A · utility

Assignee

• BASF SE

Inventors

• Peter Claassen · Ludwigshafen, DE
• Gerhard Blatz · Ludwigshafen, DE

Key dates

• Filing date: Nov 18, 1998
• Grant date: Jun 27, 2000
• Expiry date: Nov 18, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08C1/07
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

In a process for preparing coarse polymer dispersions Pg where a mixture M comprising at least one conjugated diene monomer A and at least one ethylenically unsaturated comonomer B is polymerized by free-radical aqueous emulsion polymerization in the presence of an emulsifier E and with or without further additives to form a fine polymer dispersion Pf and said fine polymer dispersion Pf is agglomerated to form a coarse such dispersion Pg, the agglomeration is carried out using a combination of chemical agglomeration and pressure agglomeration; the invention also relates to such coarse polymer dispersions and their use.