| abstract |
Hydrazides N- (2,2,6,6-tetraalkyl-4-piperidinyl) amines of dicarboxylic acids containing in the same molecule a photostabilizing group, a thermostabilizing group, and a reactive hydrazide functionality. Reactive stabilizers are obtained by the reaction of 4-amino-2,2,6,6-tetraalkylpiperidines with diesters (or mono ester acid chlorides) of dicarboxylic acids or dialkyl itaconates, followed by hydrozinolysis of the ester group of the intermediate mono ester amide. These compounds make it possible to introduce into co-reactive polymers or copolymers agents for permanent light and heat stabilization. They also serve for the stabilization of inert polymer systems against the effects of decomposition due to heat and light, by simple mixing of these, instead of reaction, with the polymers which one seeks to stabilize. |