Polyurethane-modified polyacrylate

US6001915A · kind A · utility

Assignee

• BASF COATINGS GMBH · DE

Inventors

• Stephan Schwarte · Münster, DE
• Egon Wegner · Munster, DE
• Gerhard Reusmann · Essen, DE
• Cornelia Petri-Huber · Würzburg, DE

Key dates

• Filing date: Sep 16, 1997
• Grant date: Dec 14, 1999
• Expiry date: Sep 16, 2017

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31551
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to a polyurethane-modified polyacrylate which is obtainable PA1 I. by polymerization with the addition PA2 a1) of an essentially carboxyl-free acrylate or of a mixture of acrylates, PA2 a2) of an ethylenically unsaturated monomer which carries at least one hydroxyl group per molecule and is essentially carboxyl-free or of a mixture of such monomers, and PA2 a3) of an essentially carboxyl-free, ethylenically unsaturated monomer which is different from (a1) and (a2), or of a mixture of such monomers, to give a polyurethane solution which contains no copoly-merizable double bonds, PA1 II. by subsequent further polymerization and addition PA2 b1) of at least one ethylenically unsaturated monomer which carries one carboxyl group per molecule, or of a mixture of such monomers, and PA2 b2) of an essentially carboxyl-free, ethylenically unsaturated monomer, or of a mixture of such monomers, after the monomers added in step I have been almost completely reacted, and PA1 III. by neutralization after the end of the polymerization, and dispersion in water.