| 摘要 |
6-(4-hydroxyphenyl)-4,5-dihydro-3(2H)-pyridazinones of formula I <IMAGE> (I) where R1 and R2 are independently alkyl, cycloalkyl, aryl or aralkyl, R3 and R4 are independently hydrogen or alkyl, n is 1 to 4 and T is hydrogen, alkyl, substituted alkyl, alkylene or arylene, are effective in stabilizing organic materials against oxidative, thermal and actinic degradation.
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