Levelling agents for surface coatings

US6710127B2 · kind B2 · utility

Assignee

• BYK-CHEMIE GMBH · DE

Inventors

• Karlheinz Haubennestel · Wesel, DE
• Alfred Bubat · Xanten, DE
• Albert Frank · Xanten, DE

Key dates

• Filing date: Sep 28, 2001
• Grant date: Mar 23, 2004
• Expiry date: Sep 28, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D7/47
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to levelling agents for surface coatings having a weight-average molecular weight of from 5000 to 100,000. The levelling agent is a branched polymer comprising a free-radically or ionically polymerized base molecule into which macromonomeric units containing at one end a monomeric unit which has an ethylenically unsaturated bond and possessing a weight-average molecular weight of from 1000 to 30,000 have been incorporated by free-radical or ionic copolymerization, the weight fraction of the macromonomeric units, based on the total weight of the branched polymer, being from 1 to 60% by weight. The invention further relates to the use of appropriate polymers as levelling agents for coating formulations and to coating formulations comprising the levelling agents of the invention.