NOVEL POLYMERIC PHOTOINITIATORS BEARING SIDE-CHAIN ALPHA-AMINOACETOPHENONE MOIETIES FOR ULTRAVIOLET-CURABLE PIGMENTED COATINGS

New polymeric photoinitiators with pendant alpha-aminoacetophenone moi eties, such as the homopolymers of thyl-N-(3-methacryloyloxypropyl)]am inopropan-1-one and of 1-(4-morpholinophenyl) -2-benzyl-2- ethyl-N-(3- methacryloyloxypropyl)]aminobutan-1-one have been prepared and fully c haracterized. Their photoinitiation activity has been also checked in the ultraviolet cure of a standard acrylic mixture, under irradiation over 380 nm, thus simulating the absorption conditions of a TiO2-pigme nted coating formulation. The results have been compared with those fo und by using the corresponding low-molecular-weight structural models, purposely synthesized. The activity data obtained are discussed and r elated to the structural requirements of the above systems. 1997 John Wiley & Sons, Inc.