A new polymeric HALS: preparation of an addition polymer of DGEBA–HALS and its photostabilizing effect

A linear epoxide–amine type of a new polymeric HALS was prepared by an addition polymerization of 2,2-bis(4-glycidyloxyphenyl)propane and 4-amino-2,2,6,6-tetramethylpiperidine (ATMP) in chlorobenzene. Two types of addition polymers, high molecular weight HALS (HMH) and low molecular weight HALS (LMH) were isolated by precipitation in acetone. The structure of HMH was characterized from the NMR and MALDI-TOF spectra. The effects of the reaction conditions on the yield of HMH and LMH were observed by varying the reaction conditions such as monomer concentration, reaction temperature, and reaction time. The yield of HMH increased with the amount of the ATMP concentration, reaction temperature, and reaction time. HMH is fairly miscible with polypropylene (PP), polystyrene (PS), and styrene–butadiene rubber. The photostabilizing effect of HMH on the photooxidation of PP and PS at 254 or 310 nm was studied from the UV and IR absorption spectral changes. The results indicate that the photostabilization effect of HMH was similar to or better than that of Cyabsorb UV-3529, a commercially available polymeric HALS.