| 摘要 |
N,N'-HYDROCARBYLENEBIS (N-HALS-SUBSTITUTED AMIC ACID HYDRAZIDES) AND THEIR DERIVATIVES N,N'-hydrocarbylenebis ¢N-(2,2,6,6-tetraalkyl-4-piperidinyl)amic acid hydrazides! and their derivatives are useful for stabilizing polymeric systems which are subject to degradation and/or discoloration upon exposure to heat and/or light. The novel compounds contain at least two hindered amine light stabilizing groups and two hydrazide or hydrazide derivative thermal oxidative stabilizing groups. The novel compounds are excellent light stabilizers for polyolefins, have low volatility and are not readily lost from polymeric systems via volatilization, migration or extraction.
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