Alkenyl substituted stabilizers.

摘要

Compounds of formula I <CHEM> wherein X is a group of formula Ia or Ib, <CHEM> R1 and R2 are independently e.g. hydrogen, alkyl, alkenyl, aryl or phenylalkyl, and R3 to R7 are independently e.g. hydrogen, alkyl or substituted alkyl are very effective process stabilizers for polymeric systems providing melt flow stabilization and resistance to discoloration during processing at elevated temperatures as well as effective stabilizers for lubricant compositions.