摘要:
Isopropylidenedicyclohexylene esters of 2,2,6,6-tetramethylpiperidine-4-carboxylic acid of formula: wherein R is hydrogen or alkyl (C 1 -C 8 ); R' is hydrogen, hydroxyl or alkoxy (C,-C 8 ); and R" is the group: and their use as light stabilizers for thermoplastic polymers such as polypropylene.