Binder composition and its use for coating metallic and mineral substrates

US6130285A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Martin Melchiors · Leverkusen, DE
• Jurgen Schwindt · Leverkusen, DE
• Gerhard Ruttmann · Burscheid, DE
• Wieland Hovestadt · Leichlingen, DE
• Joachim Probst · Leverkusen, DE
• Josef Pedain · Cologne, DE

Key dates

• Filing date: Aug 14, 1997
• Grant date: Oct 10, 2000
• Expiry date: Aug 14, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2150/90
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to a solvent-free, low viscosity binder composition which contains, in amounts sufficient to provide an NCO:OH equivalent ratio of 0.5:1 to 2.0:1, PA0 A) a polyisocyanate component containing one or more organic polyisocyanates and PA0 B) a solvent-free polyhydroxy component having a hydroxyl group content of 3.0 to 18 wt. % and a viscosity at 23.degree. C. of 200 to 10,000 mPa.s, which contains PA1 B.sub.1) a hydroxy-functional polyacrylate component which is prepared by polymerizing a mixture of olefinically unsaturated monomers in which at least one monomer is hydroxy-functional in the presence of PA1 B.sub.2) a compound containing ether groups and having one or more hydroxy groups. The invention also relates to the use of this binder composition in solvent-free two-component polyurethane coating compositions for coating metallic or mineral substrates.