| abstract |
Oxopiperazinyl derivatives and light stabilized compositions. The invention relates to new compounds of the type 3, 3, 5, 5-tetramethyl-2-oxo-1,4-piperazine, to polymers thereof and to the use thereof as stabilizers of organic material. These new compounds correspond to formula (I) in which R {sub, 1}, R {sub, 2}, R {sub, 3}, R {sub, 4}, R {sub, 5}, R { sub, 6}, R {sub, 7}, R {sub, 8}, R {sub, 9}, X, Y, W, S, p, q, and r have the values expressed in the description and claims. The new compounds and polymers are used as stabilizers of organic material against deterioration caused by light, oxygen and / or heat. |