Patent ID: 7879927

Claim:
A resin comprising: a) a transparent plastic exhibiting a light transmission in the visible region of at least 50%, according to Standard DIN 67-507, selected from the group consisting of polystyrene, poly(ethylene terephthalate), a transparent polyolefin, poly methyl methacrylate (PMMA), a transparent polyamide or polycarbonate; b) from 0.1 to 10 ppm, with respect to the transparent plastic (ppm: by weight) of at least one fluorescent dye which absorbs light energy in the visible light region and reemits light energy in the visible light region; and c) from 50 to 10 000 ppm, (ppm by weight) with respect to the transparent plastic of at least one optical brightener, which absorbs light energy in the 300-430 nm range and reemits light energy in the 400-500 nm range, wherein the fluorescent dye is selected from the group consisting of: perylenes of formula (I): in which R 1 denotes: an alkyl group having from 1 to 20 carbon atoms, a cycloalkyl group having from 3 to 20 carbon atoms, an alkyl group having from 1 to 20 carbon atoms which is substituted by one or more groups of —OH, —OR 2 , —C(═O)—OR 2 , —C(═O)—NR 2 R 3 , —NR 2 —C(═O)R 3 , phenyl or substituted phenyl type with R 2 and R 3 denoting —H or an alkyl group having from 1 to 20 carbon atoms, coumarins; xanthenes; thioxanthenes; azlactones; methines; and oxazines and thiazines; and wherein the optical brightener is selected from the group consisting of: distyrylbenzenes; distyrylbiphenyls; coumarins; triazinylaminostilbenes; bis(benzoxazoles); benzimidazoles; and pyrazolines.