Aqueous coating compositions containing urethane (meth)acylates having UV-hardening isocyanate groups

US6335381B1 · kind B1 · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Wieland Hovestadt · Leichlingen, DE
• Wolfgang Fischer · Meerbusch, DE
• Manfred Bock · Leverkusen, DE
• Theodor Engbert · Recklinghausen, DE
• Lothar Kahl · Bensberg, DE

Key dates

• Filing date: Apr 20, 1999
• Grant date: Jan 1, 2002
• Expiry date: Apr 20, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/8175
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to an aqueous coating composition containinga) a urethane (meth)acrylate having (meth)acryloyl groups and optionally free isocyanate groups,b) optionally a further polyisocyanate,c) a UV initiator which initiates polymerization by a free radical mechanism, andd) one or more aqueous binders containing isocyanate-reactive groups.The present invention also relates to the use of the coating compositions for coating various substrates, especially metal substrates.