5 39 methylphenyl benzotriazole 2 2 39 hydroxy 5 39 tert butylphenyl benzotriazole 2 2 39 hydroxy 3 39 methyl 5 39 tert butylphenyl benzotriazole 2 2 39 hydroxyp 5 39 cyclohexylphenyl benzotriazole 2 39 2 39 hydroxy 3 39 5 39 dimethylphenyl benzotriazole and the like the acrylate is the polycarbonate aggressive component of the solution and functions as a softening or swelling agent for the polycarbonate once the polycarbonate surface is softened or swelled the ultraviolet light absorbent diffuses or permeates into the softened surface of the polycarbonate the hydroxy ether acts as a mitigating agent for the acrylate that is it acts to prevent a too rapid and too aggressive attack by the acrylate upon the polycarbonate thereby allowing an even and uniform impregnation of the surface of the softened polycarbonate by the ultraviolet light absorbent compound while preventing etching and discoloration of the polycarbonate by the acrylate the acrylate and the hydroxy ether are then evaporated from the treated polycarbonate article the resultant polycarbonate article is resistant to ultraviolet light degradation while at the same time retaining all of the desirable characteristics of an untreated polycarbonate article this process is in sharp contrast to the prior art process as taught for example in german offen no 2 211 641 which provides a very active surface impregnation technique wherein small articles are endowed with improved ultraviolet light resistance by a short e.