| 摘要 |
PURPOSE:To obtain the subject copolymer having a specific dynamic viscosity coefficient by adding and reacting a dihalogeno aromatic sulfone with an alkali metallic hydroxide and an alkali metallic hydrosulfide and then reacting the resultant reaction product with a dihalogeno aromatic carboxylic acid. CONSTITUTION:(A) Hydrosulfide and hydroxide of an alkali metal such as lithium are added and mixed in a polar solvent such as acetamide, mixed and dehydrated. (B) A dihalogeno aromatic sulfone (e.g. 4,4'-dichlorodiphenyl sulfone) is then added and reacted therewith at preferably 150-300 deg.C. (C) A dihalogeno aromatic carboxylic acid (e.g. 2,4-dichlorobenzoic acid) and the component (A) are added and further reacted with the resultant product to afford the objective copolymer having 10 to 10<5> P dynamic viscosity coefficient at 316 deg.C. |
