| 摘要 |
New compounds of formula (I): ¢I! ¢in which: 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- (in which 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, 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 thereof are valuable polymer stabilizers. |
