Substrates coated with a thermoset acrylic primer and an alkoxysilylbenzotriazole UV stabilizer

Claim 1

An article comprising (A) a substrate coated with a thermoset acrylic primer, (B) a hard, protective coating thereon comprising an aqueous coating composition which comprises before curing, (a) a dispersion of a colloidal silica in a solution of the partial condensate of a silanol having the formula, R.sup.7 Si(OH.sub.3, where R 7 is selected from the group consisting of C.sub.(1-8) alkyl and C.sub.(6-13) aryl, at least 70 weight percent of which is CH 3 Si(OH) 3 , in a mixture of an aliphatic alcohol and water, said dispersion containing from 10 to 50 percent by weight of solids, said solids consisting essentially of 10 to 70% by weight of colloidal silica and 30 to 90% by weight of the partial condensate and (b) an effective amount of an ultraviolet light absorbing agent comprising a compound having the formula, ##STR6## where Z is ##STR7## R is a C.sub.(1-8) alkyl radical, R 1 is a C.sub.(1-8) alkyl or C.sub.(6-12) aryl radical, R 2 is selected from hydrogen and R, R 3 is selected from hydrogen, C.sub.(1-8) alkyl, C.sub.(1-8) alkoxyl, carbalkoxy, hydroxy, amino, halogen, and Q-(CH 2 ) 3 -Si(OR) 3 , where Q is selected from --O--, --NR 2 -, and ##STR8## R 4 -R 6 are selected from hydrogen and the same or different C.sub.(1-8) alkyl, C.sub.(1-8) alkoxy and halogen radicals, a is an integer equal to 1 to 3 inclusive, b is a whole number equal to 0 to 2 inclusive and the sum of a+b is equal to 1 to 3 inclusive.