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BASF patents sol-gel coating for varnish



Published August 16, 2005
Patent No. U.S. 6,872,765 B1
BASF Coatings has received a
patent for a sol-gel coating material
comprised of an acrylate copolymer
solution comprising a reaction product
of at least one (meth)acrylic ester that
is substantially free of acid groups, at
least one ethylenically unsaturated
monomer that carries at least one
hydroxyl group per molecule and is substantially
free of acid groups and at
least one ethylenically unsaturated
monomer that carries per molecule at
least one acid group that can be converted
into a corresponding acid anion
group; a stock varnish comprising a
hydrolysis and condensation product of
at least one hydrolyzable silane of the
general formula SiR4, in which the
variable R equals hydrolyzable groups,
hydroxy groups and nonhydrolyzable
groups, with the proviso that at least
one hydrolyzable group is present; and
an additive solution comprising at least
one ethylenically unsaturated compound
containing at least one epoxide
group, at least one silane having at
least one nonhydrolyzable group R that
contains at least one epoxide group and
at least one adduct of silane having at
least one nonhydrolyzable group R that
contains at least one amino group and
at least one cyclic ethylenically unsaturated
dicarboxylic anhydride.


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