| 摘要 |
PURPOSE:To efficiently obtain the subject copolymer having excellent heat resistance, transparency and strength by dividedly adding styrene-based monomer and methacrylic acid-based monomer to a reaction system under a specific condition and subjecting to suspension polymerization. CONSTITUTION:(A) Styrene-based monomer and (B) methacrylic acid monomer are used in a weight ratio of 75-95wt.% the component A and 5-25wt.% the component B and 100wt.% total of the both. At first, suspension polymerization is initiated in the presence of 75-100wt.% of total using amount of the component A and 20-80wt.% of total using amount of the component B. Next, on the way of the polymerization, residual 0-25wt.% of the component A, residual 20-80wt.% of the component B and water are added to the polymerization system and copolymerized to afford the objective copolymer. Besides, at the initiation of the polymerization, total using amount of the component A is preferably presented. |
