| 摘要 |
PURPOSE:To obtain the titled copolymer, having heat resistance, impact resistance and processability together and useful for automotive parts, etc., by copolymerizing a specific maleimide based monomer with an aromatic vinyl monomer, vinyl cyanide monomer and comonomer stepwise under specific conditions. CONSTITUTION:A monomer consisting of (A) 50wt% maleimide based monomer expressed by the formula [R is H, (substituted) alkyl or (substituted) aryl], (B) 40-80wt% aromatic vinyl monomer, (C) 10-35wt% vinyl cyanide monomer and (D) 0-10wt% another copolymerizable monomer is first reacted to polymerize the total amount of the component (A), 10-100wt% component (B), <10wt% component (C) and 0-100wt% component (D). At a stage of >=80% polymerization conversion of the component (A), the remaining total amount of the components (B), (C) and (D) is added thereto to complete the polymerization and afford the aimed copolymer.
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