Radiation curable powder coating compositions and their use

US6825240B2 · kind B2 · utility

Assignee

• Degussa AG · DE

Inventors

• Andreas Wenning · Nottuln, DE
• Giselher Franzmann · Witten, DE
• Emmanouil Spyrou · Schermbeck, DE

Key dates

• Filing date: Dec 18, 2002
• Grant date: Nov 30, 2004
• Expiry date: Dec 29, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2250/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A radiation curable powder coating composition, comprising I.) a binder comprising A) 60-90% by weight of at least one amorphous urethane acrylate; and B) 10-40% by weight of at least one crystalline urethane acrylate; wherein a Tg of a mixture of A) and B) is at least 35° C.; and II.) an auxiliary and an additive, excluding an UV initiator, crosslinks to yield a lightfast and weather-stable film.