Aqueous polymer dispersions, processes for preparing them, and their use

US8334350B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Ekkehard Jahns · Weinheim, DE
• Sebastian Roller · Mannheim, DE

Key dates

• Filing date: Dec 16, 2008
• Grant date: Dec 18, 2012
• Expiry date: Dec 16, 2028

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31667
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to an aqueous polymer dispersion whose dispersed addition polymer P comprises, copolymerized in free-radically polymerized form, at least one polar monomer having a water solubility of greater than 50 g/liter (measured at 20° C.), and obtainable by free-radically initiated aqueous emulsion polymerization, the polar monomer being metered to the reaction mixture during the polymerization process at a variable, i.e., nonconstant rate, for example in the sense of a rate gradient. The present invention further relates to processes for preparing these aqueous polymer dispersions, to their use as binders and/or in coatings, and also to coatings comprising the polymer dispersion of the invention.