Synthesis of new combined 2,2,6,6-tetramethylpiperidine-2-hydroxyphenylbenzotriazole 1,3,5-triazine derivatives as stabilizers for polymers

The synthesis of new stabilizer compounds (a combination of 2,2,6,6-tetramethylpiperidine and 2-hydroxyphenylbenzotriazole in one molecule) is reported. Four polymerizable combined stabilizers as well as two unsaturated triazinyl-2,2,6,6-tetramethylpiperidines and two unsaturated triazinyl-2-hydroxyphenylbenzotriazoles as individual stabilizers were synthesized. Their copolymers and the ter-copolymers of the individual stabilizers with methyl methacrylate were obtained. Chemical bonding of the stabilizers in the polymer was confirmed spectrophoto metrically. The influence of these additives on the photostability of the copolymers was studied. The participation of the combined stabilizers in the polymerization did not significantly affect the molecular weight or polydispersity of the copolymers. A significant stabilizing effect against photodegradation was found. (C) 2001 Elsevier Science Ltd. All rights reserved.