Heterocyclic benzoate ultraviolet stabilizers and their use in organic compositions

Claim 1

An organic composition susceptible to ultraviolet light degradation stabilized against such degradation with a stabilizing amount of at least one ester of a heterocyclic aromatic acid compound having the following formula: ##STR15## wherein A is a group having the structure ##STR16## wherein X and Y are a carbon atom or a nitrogen atom; Z is an oxygen atom, a sulfur atom, a nitrogen atom, or a nitrogen atom containing a hydrogen atom or a substituted or unsubstituted lower alkyl group having 1 to 12 carbon atoms; R 1 , R 2 , R 3 and R 4 are hydrogen, chloro, bromo, lower alkyl, substituted lower alkyl, cycloalkyl, substituted cycloalkyl, aryl, substituted aryl, lower alkylaryl, aryl-substituted-aryl, alkoxy, substituted amino, cyano, 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 Y substituent and the carbon atom attached to the carboxyl group connecting the heterocyclic aromatic A group with the aromatic B group, said carbonyl connecting group is attached to the benzenoid ring in either the meta or para position from the carbon atom connected to the Y substituent; and B is a group having the formula: ##STR17## wherein: at least one R 5 or R 9 is hydrogen and the other R 5 , R 6 , R 7 , R 8 and R 9 are hydrogen, lower alkyl, substituted lower alkyl, cycloalkyl, substituted cycloalkyl, aryl, substituted aryl, lower alkylaryl, aryl-substituted-aryl, alkoxy, substituted amino, carboalkoxy, nitrile, chloro, bromo and the substituents R 5 and R 6 , R 6 and R 7 , R 7 and R 8 , R 8 and R 9 combined with the carbon atoms to which they are attached are joined alkylene groups completing a carbocyclic ring which can be substituted with any of the substituents listed above for R 5 , R 6 , R 7 , R 8 and R 9 .