Low viscosity allophanates containing actinically curable groups

US8604097B2 · kind B2 · utility

Assignee

• Bayer MaterialScience AG · DE

Inventors

• Jan Weikard · Neunburg vorm Wald, DE
• Christophe Detrembleur · Liège, BE
• Dorota Greszta-Franz · Erkrath, DE
• Frank Richter · Frankfurt, DE
• Wolfgang Fischer · Meerbusch, DE
• Jörg Schmitz
• Holger Mundstock · Wermelskirchen, DE

Key dates

• Filing date: Jan 27, 2011
• Grant date: Dec 10, 2013
• Expiry date: Jan 27, 2031

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D175/16
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for preparing radiation-curing binders containing allophanate groups by reacting, at temperatures of ≦130° C., A) one or more compounds containing uretdione groups with B) one or more OH-functional compounds which contain groups which react, with polymerization, with ethylenically unsaturated compounds on exposure to actinic radiation (radiation-curing groups), C) optionally NCO-reactive compounds other than B), in the presence of D) a catalyst containing at least one zinc compound, to form allophanate groups by opening the uretdione ring. The present invention also relates to the binders obtained by the process of the invention and to coating compositions containing these binders.