Bis-salicyloyl-dicarboxylic acid dihydrazides as stabilizers for polyolefines

A compound of the formula ##STR29## wherein X denotes a direct bond, alkylene of 1 to 8 carbon atoms, m-phenylene or p-phenylene;

• n denotes 0 or 1;
• and
• the rings A are each unsubstituted, or one or both rings A are substituted with an hydroxyl, a chlorine atom, an .alpha.-methylbenzyl, an alkanoyloxy of 2 to 18 carbon atoms or an alkanoylamino of 2 to 18 carbon atoms;
• or with one or two alkyl groups each of 1 to 8 carbon atoms, or one or two alkoxy groups each of 1 to 18 carbon atoms.