METHACRYLIC RESIN COMPOSITION EXCELLENT IN HEAT RESISTANCE, LIGHT RESISTANCE AND WEATHERABILITY

摘要

PURPOSE: To obtain a methacrylic resin composition excellent in heat resistance, light resistance and weatherability by incorporating an amine having steric hindrance and a benzotriazole light stabilizer each in a specified amount into a copolymer containing specified six-membered ring acid anhydride units. ;CONSTITUTION: A copolymer of an ethylenically unsaturated monomer (e.g. methyl methacrylate) with methacrylic acid is heat-treated to form six-membered ring acid anhydride units, thus producing a copolymer which contains at least 3wt.% six-membered ring acid anhydride units of formula I and whose solution made by dissolving 0.15g of it in acetone to give a volume of 0.5dl has a reduced viscosity of 0.01-1dl/g at 25°C. 100 pts.wt. this copolymer is mixed with 0.01-1 pt.wt. amine having steric hindrance, containing at least one group of formula II (wherein X is H, CH₃ or CH₃CH₂-O) (e.g. a compound of formula III) and 0.01-1 pt.wt. benzotriazole light stabilizer (e.g. a compound of formula IV) to give the objective composition.;COPYRIGHT: (C)1993,JPO&Japio