| 摘要 |
PURPOSE:To obtain the titled copolymer with specific glass transition point, outstanding in heat resistance, flame-retardancy, thermoplasticity, etc., suitable for electric wire covering materials, etc., by polymerization, using a radical polymerization initiator, between specific components including a vinylidene halide in specified proportions. CONSTITUTION:The objective copolymer with a glass transition point >=85 deg.C can be obtained by polymerization, using a radical polymerization catalyst, between (A) 30-65mol% of a vinylidene halide (pref. vinylidene chloride), (B) 1-10mol% of at least one kind of N-substituted maleimide of formula I (R1 is 1-4C alkyl, etc.) (pref. N-phenyl maleimide), (C) 25-70mol% of at least one kind of copolymerizable unsaturated monomer of formula II (R4 is H, etc.; R5 is halogen, etc.) (pref. a mixture of acrylonitrile and styrene), and (D) 0-0.1mol% of at least one kind of compound having two double bonds of formula III [R7 is H, etc.; R8 is group of formula IV (n is 1-25)]. |
