6-(4-hydroxyphenyl)-4,5-dihydro-3(2H)-pyridazinones and stabiliz

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...


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524100, C08K 53477




6-(4-hydroxyphenyl)-4,5-dihydro-3(2H)-pyridazinones of formula I ##STR1## where R.sub.1 and R.sub.2 are independently alkyl, cycloalkyl, aryl or aralkyl, R.sub.3 and R.sub.4 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.

patent: 3377154 (1968-04-01), Reichemeder et al.
patent: 4011321 (1977-03-01), Coates et al.
patent: 4397854 (1983-08-01), Sircar
patent: 4888423 (1989-12-01), Odorisio et al.


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