Polychromophoric ultraviolet stabilizers and their use in organic compositions

An organic composition susceptible to ultraviolet degradation stabilized against such degradation with a stabilizing amount of a composition of matter comprising compounds having the formula:

• ##EQU2## wherein A is a group having the structure:
• ##SPC12##
• wherein
• R.sub.1, r.sub.2, r.sub.3, r.sub.4 and R.sub.5 are hydrogen, hydroxy, chloro, bromo, fluoro, lower alkyl, substituted lower alkyl, cycloalkyl, substituted cycloalkyl, aryl, substituted aryl, lower alkylaryl, alkoxy, aryloxy, amino, substituted amino, cyano, carboalkoxy and the substituents R.sub.1 and R.sub.2, R.sub.2 and R.sub.3, R.sub.3 and R.sub.4, and R.sub.4 and R.sub.5 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.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 ;
• B is a heterocyclic group having the structures ##SPC13##
• wherein
• X and Y are a carbon atom, a carbon atom containing an alkyl group having 1 to 12 carbon atoms, a carbon atom containing an aryl group having 6 to 18 carbon atoms or a nitrogen atom;
• Z is an oxygen atom, a sulfur atom, or a nitrogen atom containing a hydrogen atom or a substituted or unsubstituted lower alkyl group having 1 to 12 carbon atoms;
• I is hydrogen, chloro, bromo, fluoro, lower alkyl, substituted lower alkyl, cycloalkyl, substituted cycloalkyl, aryl, substituted aryl, lower alkylaryl, aryl-substituted-aryl, alkoxy, aryloxy, substituted amino and cyano, said I 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 carbonyloxy or oxycarbonyl group, E is a substituted or unsubstituted alkylene and arylene and n is an integer from 1 to 6 wherein at least one of R.sub.1, R.sub.5 or I ortho to the oxy of said carbonyloxy or oxycarbonyl group is hydrogen.