| abstract |
PURPOSE: To reduce the coloration during molding at a high temperature and improve the heat distortion resistance by compounding a specific copolymer and a specific organophosphorus compd. n CONSTITUTION: 100 pts.wt. copolymer obtd. by copolymerizing 35-90wt.% methyl methacrylate, 10-35wt.% N-substd. maleimide of formula I (wherein R is H, 1-18C alkyl, cyclohexyl, benzyl, or substd. aryl), and 0-30wt.% other copolymerizable monomer (e.g. styrene) is compounded with 0.005-1 pt.wt. at least one organophosphorus compd. selected from the group consisting of compds. of formulas II, III, and IV (wherein R 1 , R 2 , and R 3 are each alkyl; R 4 is alkyl, cycloalkyl, or phenyl optionally substd. by alkyl; R 5 , R 6 , and R 7 are each H, alkyl, or alkoxy; and n is 0-3). n COPYRIGHT: (C)1991,JPO&Japio |