2-[2-Hydroxy-3,5-di-(.alpha. ,.alpha.-dimethylbenzyl)-phenyl]-2H-benzotriazole and stabilized compositions
AssigneeCiba-Geigy Corporation
InventorsMartin Dexter, Roland A. E. Winter
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Abstract
2-[2-Hydroxy-3,5-di-(.alpha.,.alpha.-dimethylbenzyl)phenyl]-2H-benzotriazol e exhibits outstanding efficacy in protecting organic substrates from light induced deterioration as well as good resistance to loss by volatilization or exudation during the high temperature processing of stabilized compositions. The combination of the benzotriazole UV absorber with a hindered amine light stabilizer is particularly efficacious in protecting thermoset and thermoplastic acrylic resin automotive finishes and enamels.
Claims14
An automotive topcoat finish, lacquer or enamel composition exhibiting retention of gloss and resistance to delamination on weathering which comprises
- (a) a thermoplastic acrylic resin or a thermoset acrylic resin,
- (b) 0.1 to 5% by weight of resin of a compound of the formula ##STR27## wherein T.sub.1 is hydrogen or chloro, T.sub.2 and T.sub.3 are independently the group ##STR28## where T.sub.4 is hydrogen or lower alkyl, T.sub.5 is tert-octyl or the group ##STR29## T.sub.6 has the same meaning as T.sub.5, with the proviso that one of T.sub.5 and T.sub.6 must be tert-octyl, but both cannot be tert-octyl, and
- (c) 0.1 to 5% by weight of resin of a hindered amine light stabilizer.
Dependencies are inferred from the claim text.