US 6,713,559 B1Granted

Sol-gel coating

AssigneeBASF Coatings GmbH

InventorsManuela Armbrust, Horst Hintze-Brüning, Wilfried Stübbe, Peter Betz, Christel Ehlig

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Abstract

The invention relates to a sol-gel coating material, containing (A) an acrylate copolymer solution, consisting of at least one acrylate copolymer (A1), (B) a sol which can be produced by the hydrolysis, condensation and complexing of at least one hydrolysable metal compound (B1) of the dormula (1): MRn; wherein the variable and the index have the following meanings: M=aluminium, titanium or zirconium; R=hydrolysable group, hydroxy groups and non-hydrolysable groups, with the proviso that there should be at least one, preferable two hydrolysable groups; and n=3 or 4; by the hydrolysis, condensation and complexing of at least one hydrolysable silane (B2) of the formula (II): Si(R1)2(R2)2; wherein the varible R1 and R2 have the following meanings: R1=alkyl and/or cycloalkyl radicals and R2=alkoxy and/or cycloakoxy radicals; and by the hydrolysis, condensation and complexing of at least one hydrollysable silane (B3) of the formula (III): SiR4; wherein the variable R has the aforementioned given meaning: with the proviso that the silane (B3) is not a silane (B2) according to the general formula (II); and (C) between 0 and 40% by weight in relation to the total quantity of the coating material, of a parent lacquer which can be produced by the hydrolysis and condensation of least one hydrolysable silane (B3) of general formula (III).

Claims23

Dependent claims

A sol-gel coating material comprising

(A) an acrylate copolymer solution comprising at least one acrylate copolymer (A1) prepared by copolymerizing at least the following monomers:
a1) at least one (meth)acrylic ester which is substantially free of acid groups,
a2) at least one ethylenically monomer which bears at least one hydroxyl group per molecule and is substantially free of acid groups, and
a3) at least one ethylenically unsaturated monomer which bears per molecule at least one acid group which is convertible into the corresponding acid anion group;
(B) a sol prepared by hydrolyzing, condensing and complexing
B1) at least one hydrolyzable metal compound of the general formula I
MRn (I)
where the variables and the index have the following meaning:
M=aluminum, titanium or zirconium,
R=hydrolyzable groups, hydroxyl groups, nonhydrolyzable groups, and mixtures thereof, with the proviso that there is at least one hydrolyzable group, and
n=3 or 4;
B2) at least one hydrolyzable of the general formula II
Si(R1)2(R2)2 (II)
in which the variables R1 and R2 have the following meaning:
R1=alkyl radicals, cycloalkyl radicals, and mixtures thereof, and
R2=alkoxy radicals, cycloalkoxy radicals, and mixtures thereof;
and
B3) at least one hydrolyzable silane of the general formula III
SiR4 (III),
where the variable R has the meaning above;
with the proviso that the silane (B3) is not a silane (B2) according to general formula II, and
(C) 0 to 40% by weight based on the total amount of coating material, of a material prepared by hydrolyzing and condensing at least one hydrolyzable silane (B3) of the general formula III.

19 more elements

Dependencies are inferred from the claim text.