Polymethine compounds and polymer compositions containing them.

摘要

Disclosed are poly-methine compounds having the formula: <CHEM> wherein R<1> is an unsubstituted or substituted alkoxycarbonyl, cycloalkoxycarbonyl or aryloxycarbonyl radical; an unsubstituted or substituted carbamoyl radical; or an unsubstituted or substituted alkylsulfonyl, cycloalkylsulfonyl or arylsulfonyl radical, or an unsubstituted or substituted aryl radical; R<2> is an unsubstituted or substituted alkyl, cycloalkyl or aryl radical; R<3> is hydrogen, alkyl, -OR<2> or halogen; and L is an organic linking group bonded by non-oxo carbon atoms to the oxygen atoms adjacent to L. Also disclosed are admixtures of 100 to 10,000 ppm of at least one of the poly-methine compounds and certain condensation polymers. The resulting polymer compositions are useful to protect substrates or materials susceptible to degradation by ultraviolet light.