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 and
a is an integer from 1 to 3, and
II) a lacquer resin (D) which can react with isocyanate groups as adhesion promoter.
Type:
Grant
Filed:
January 22, 2002
Date of Patent:
June 29, 2004
Assignee:
Bayer Aktiengesellschaft
Inventors:
Steffen Hofacker, Markus Mechtel, Wieland Hovestadt, Claus Kobusch