Patent ID: 6713559
Filing Date: 2004-03-30
Classification: C08L,C09D,Y10T

Abstract:
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 MRnâ€ƒâ€ƒ(I) â€ƒwhere 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)2â€ƒâ€ƒ(II) â€ƒin 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 SiR4â€ƒâ€ƒ(III), â€ƒwhere the variable R has the meaning above; â€ƒwith 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.