| abstract |
PURPOSE: To attempt to improve weatherability, by providing a copolymer consisting of five monomeric components contg. polymerizable monomers stable to ultraviolet light as a polyol component of a two-pack urethane resin coating. n CONSTITUTION: An acrylic polyol is provided by copolymerizing a component (100% in total) consisting of 0.1W10.0wt.% polymerizable monomer stable to ultraviolet light consisting of an ester or an amide of an α-β-unsatd. carboxylic acid contg. piperidine groups of formula I or II (wherein R 1 is H or CN; R 2 and R 3 are each independently H or a 1W2C alkyl; R 4 is H or a 1W18C alkyl), 5.0W97.9% polymerizable unsatd. monomer having a cycloalkyl group (e.g., cyclohexyl methacrylate), 2.0W35.0% polymerizable unsatd. monomer having a hydroxyl group (C) (e.g., hydroxyethyl methacrylate), 0W10.0% polymerizable ultraviolet absorbing monomer (D) (e.g., a reaction product of 2,4- dihydroxybenzophenone with glycidyl acrylate) and 0W92.9% other copolymerizable monomer. n COPYRIGHT: (C)1989,JPO&Japio |