| 摘要 |
The present invention relates to a novel method for stabilizing synthetic thermoplastic materials against thermal degradation, which comprises incorporating in said materials one or more compounds of the formula (I) <CHEM> in which R1 is unsubstituted or substituted phenyl, n is e.g. 1, 2 or 3, and, when n is 1, R2 is e.g. -COR3, - COOR4 or -CO-N(R5)R6 in which R3 is e.g. C4-C17alkyl, R4 is e.g. C4-C18alky cyclohexyl or t-butylcyclohexyl, R5 and R6 which can be identical or different are e.g. C2-C8alkyl or cyclohexyl, and, when n is 2, R2 is e.g. -CO-R10-OC, -COO-R11-OOC- or -CONH-R12-NHCO- in which R10 is e.g. C2-C8alkylene, R11 is e.g. C4-C6alkylene and R12 is e.g. C4-C6alkylene, and, when n is 3, R2 is e.g. benzenetricarbonyl. Several compounds of the formula (I) are new |
