Poly 1,4-dihydro-2,6-dimethylpyridine-3,5-dicarboxylic esters useful as thermal stabilizers for synthetic polymers and processes for their preparation

摘要

Poly-dihydro-2,6-dimethylpyridine-3,5-dicarboxylesters of general formula (I) IMAGE IMAGE +TR IMAGE in which A, B, m, n, k, j, R, R1 and R2 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): R3-CO-CH2-CO-R4 (II) in which R3 and R4 have the meanings defined in the text, in masses containing organic calcium and zinc salts as basic stabilizers.