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US4908398A Poly 1,4-dihydro-2,6-dimethylpyridine-3,5-dicarboxylesters useful as thermal stabilizers for synthetic polymers 失效
可用作合成聚合物的热稳定剂的聚1,4-二氢-2,6-二甲基吡啶-3,5-二羧酸酯

Poly 1,4-dihydro-2,6-dimethylpyridine-3,5-dicarboxylesters useful as
thermal stabilizers for synthetic polymers
摘要:
Poly-dihydro-2,6-dimethylpyridine-3,5-dicarboxylesters of general formula (I) ##STR1## in which A, B, m, n, k, j, R, R.sup.1 and R.sup.2 have the meanings defined in the text, useful as thermal stabilizers for synthetic polymers, in particular for polyvinylchloride-based masses.The compounds of formula (I) are preferably used in combination with the usual stabilizers based on organic metal derivatives. They can also be used combined with agents which exert a synergic action in maintaining a low color of manufactured articles subjected to heating, and in particular with betadicarbonyl compounds of formula (II):R.sup.3 --CO--CH.sub.2 --CO--R.sup.4 (II)in which R.sup.3 and R.sup.4 have the meanings defined in the text, in masses containing organic calcium and zinc salts as basic stabilizers.
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