Process for the production of coatings based on unsaturated polyester resins by hardening under infra-red radiation

US5068125A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Jurgen Meixner · Krefeld, DE
• Horst Clemens · Krefeld, DE
• Armin Sickert · Krefeld, DE

Key dates

• Filing date: Aug 27, 1990
• Grant date: Nov 26, 1991
• Expiry date: Aug 27, 2010

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D167/06
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A coating is obtained on a substrate by applying to the substrate a composition containing as a binder an unsaturated polyester and hardening the coating by infra-red radiation, wherein the binder is a monomer-free olefinically unsaturated polyester resin having a viscosity of 2,000 to 5,000 mPa.s at 23.degree. C. and consists essentially of the esterification reaction product of: PA0 A) 1.0 mol of an unsatured dicarboxylic acid component selected from the group consisting of maleic acid, maleic anhydride, fumaric acid and mixtures thereof, PA0 B) 0.5 to 1.2 mol of a diol component which is a dihydric alcohol with 2 to 8 carbon atoms, PA0 C) 0.5 to 1.1 mol of at least one unsaturated ether component which is a monofunctional hydroxy compound containing one or more .beta.,.gamma.-ethylenically unsaturated alkenyl ether moieties in the molecule, and PA0 D) 0 to 0.55 mol of an alcohol component which is a saturated monohydric alcohol with 4 to 10 carbon atoms. and the coating composition is useful as an automotive body repair putty.