| 摘要 |
Compounds of the formula I, II, III or IV <IMAGE> wherein X is halogen, OH, -OR1, -OOCR2, -OOC-R4-COOR3 or -N(R5)(R6), or the two X groups together form a group -O-R9-O- or -OOC-R9-COO-, Y has one of the meanings given for X, or it is -NHR5, -NHNH2 or -NHNH-phenyl, Z has one of the meanings given for X, or is -SR, and R, R1, R2, R3, R4, R5, R6, R9 and R' are organic radicals having the meanings defined hereinbelow, are thermal stabilizers for chlorine-containing thermoplastics particularly for PVC. Their effect can be further intensified by the addition of co-stabilizers.
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