Synthesis and application of new combined 2,2,6,6-tetramethylpiperidine-2-hydroxybenzophenone 1,3,5-triazine derivatives as photostabilizers for polymer materials

The synthesis of new stabilizer type compounds (a combination between 2,2,6,6-tetramethylpiperidine and 2-hydroxybenzophenone in one molecule) under phase transfer catalysis (PTC) conditions is reported. The most favorable reaction conditions (the type of two-phase system, solvent, catalyst) were selected. Two polymerizable combined stabilizers as well as two unsaturated triazinyl-2,2,6,6-tetramethyl-piperidines and an unsaturated triazinyl-2-hydroxybenzophenone as individual stabilizers were synthesized under these conditions. Their copolymers and the ter-copolymers of the individual stabilizers with methyl methacrylate (MMA) were obtained. The influence of these additives on the rate of copolymerization and on the photostability of the copolymers was studied. The participation of the combined stabilizers in the polymerization did not affect considerably the rate of copolymerization, molecular weight and polydispersity of the copolymers. A significant stabilizing effect against photodegradation was determined. (C) 2002 Elsevier Science B.V. All rights reserved.