| 摘要 |
A polymer composition comprising a polymer stabilized against the effects of light and heat by the incorporation of a polymer stabilizer, wherein the polymer stabilizer comprises at least one compound selected from the group consisting of compounds of formula (I): <IMAGE> (I) wherein R1 is hydrogen, alkyl, alkoxyalkyl, carboxylic acyl or phenylalkyl, or an optionally substituted tetramethylpiperidyl group; R2 is hydrogen, alkyl, carboxylic acyl or phenylalkyl group; R3 is alkylene optionally interrupted by at least one oxygen atom; X is oxygen or -NR5-, wherein R5 is hydrogen or alkyl; Y is -OCO-, -COO-, -CONH- or -OCONH-; n is 2 to 4; and, when n is 2, Z is alkylene optionally interrupted by at least one oxygen, or sulfur or aryl, cycloalkyl or heterocyclic group, or, when n is 3, Z is alkanetriyl in which a carbon is optionally replaced by nitrogen or, when n is 4, Z is alkanetetrayl optionally interrupted by at least one oxygen atom, and acid addition salts of such compounds.
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