Polychromophoric benzotriazole ultraviolet stabilizers for organic compositions

Claim 1

An organic composition susceptible to ultraviolet light degradation stabilized against such degradation with a stabilizing amount of at least one compound having the formula: (A).sub.a --C wherein A is a group having the structure ##SPC9## wherein the oxy group is in the meta or para position to the benzotriazole group; R 1 , r 2 , r 3 and R 4 are hydrogen, chloro, bromo, fluoro, lower alkyl, substituted lower alkyl, cycloalkyl, substituted cycloalkyl, aryl, substituted aryl, lower alkylaryl, aryl-substituted-aryl, alkoxy, substituted amino, cyano, carboalkoxy and the substituents R 1 and R 2 , R 2 and R 3 , and R 3 and R 4 , combined with the carbon atoms to which they are attached, are joined alkylene groups completing a carbocyclic ring, which ring can also be substituted with one or more of the substituents listed above for R 1 , R 2 , R 3 and R 4 ; I is the same as R 1 , R 2 , R 3 and R 4 and is present on all positions of the benzenoid ring, except the carbon atom attached to the heterocyclic ring and the carbon atom attached to the carbonyl group connecting the heterocyclic aromatic A group with the aromatic C group, at least one I substituent on one of the carbon atoms adjacent to said carbon atoms attached to said carbonyl group is hydrogen and said remaining I substituents can all be the same or different; a is an integer of 1 to 4; and C is an aromatic group having the formula: ##SPC10## where I is the same substituent as listed above and is present in all positions of the benzenoid ring except the carbon atom attached to the carbonyl group connecting the A and C moieties, and said I substituents can all be one of the substituents listed above or different listed substituents.