Two-component polyurethane binders as primers

US6756464B2 · kind B2 · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Steffen Hofacker · Rockenberg, DE
• Markus Mechtel · Neunburg vorm Wald, DE
• Wieland Hovestadt · Leichlingen, DE
• Claus Kobusch · Meerbusch, DE

Key dates

• Filing date: Jan 22, 2002
• Grant date: Jun 29, 2004
• Expiry date: Jan 22, 2022

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31551
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to a primer containing a solvent-containing two-component polyurethane binder comprising I) a curing component (A), comprising an addition product of at least one organic polyisocyanate (B) with an average NCO functionality of 2.5 to 5.0 and an isocyanate content of 8 to 27 wt. % and an alkoxysilane (C) of formula (I) with at least one isocyanate-reactive group,Q—Z—SiXaY3−a  (I),in which Q represents an isocyanate-reactive group,Z represents a linear or branched C1-C12 alkylene group,X represents a hydrolyzable group,Y represents identical or different C1-C4 alkyl groups anda is an integer from 1 to 3, andII) a lacquer resin (D) which can react with isocyanate groups as adhesion promoter.