Thermally hardening, transparent coating substance, method for the production thereof and its use

US7687576B2 · kind B2 · utility

Assignee

• BASF COATINGS GMBH · DE

Inventors

• Günter Klein
• Ulrike Rockrath · Senden, DE
• Jurgen Niemann · Hachenburg, DE
• Ulrich Poth · Munster, DE
• Andre Brosseit · Hamm, DE
• Karin Wermelt · Munster, DE
• Alexandra Huber · Dreieich, DE

Key dates

• Filing date: Jul 10, 2004
• Grant date: Mar 30, 2010
• Expiry date: Aug 17, 2025

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D175/04
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A thermosetting transparent coating material, its preparation and use. The coating includes (meth)acrylate (co)polymer having a number-average molecular weight of from 1,000 to 6,000 daltons, a glass transition temperature of −15 to +70° C., and a hydroxyl number of from 80 to 200 mg KOH/g; polyester having a number-average molecular weight of from 800 to 6,000 daltons, a hydroxyl number of from 80 to 200 mg KOH/g and an acid number of from 1 to 50 mg KOH/g, comprising, based on the polyester, from 30 to 70% by weight of cycloaliphatic structural units; a blocked polyisocyanate in which the blocked polyisocyanate groups are attached to flexibilizing structural units which, as part of a three-dimensional network, lower its glass transition temperature; and blocked polyisocyanate in which the blocked polyisocyanate groups are attached to hardening structural units which, as part of a three-dimensional network, raise its glass transition temperature.