| 摘要 |
<p>Disclosed are poly-methine compounds having formula (I), wherein R1 is an unsubstituted or substituted alkoxycarbonyl, cycloalkoxycarbonyl or aryloxycarbonyl radical; an unsubstituted or substituted carbamoyl radical; or an unsubstituted or substituted alkylsulfonyl, cycloalkyl-sulfonyl or arylsulfonyl radical, or an unsubstituted or substituted aryl radical; R2 is an unsubstituted or substituted alkyl, cycloalkyl or aryl radical; R3 is hydrogen, alkyl, -OR2 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.</p> |
