A new polymeric hindered amine light stabilizer-copolymer from propylene and 2

2

6

6-tetramethyl-4-piperidinyl maleate (P1) has been prepared by two steps. Based on the elemental analysis and 13C-NMR

1H-NMR

IR

the structure of the product (P1) has been illustrated.The decomposition temperature of P1 is 220℃ which is about 100℃ higher than that of the small molecule hindered amine TMP (2

2

6

6-tetramethyl-4-hydroxy piperidine). P1 shows having a good photoprotecting effectiveness. The mechanism of photostabilizing action of P1 is by was of forming nitroxy stable free radical.