| 摘要 |
PURPOSE:To produce a block copolymer of improved heat resistance by forming a polyphenylene sulfide-containing reaction solution in the first step and performing the formation and bonding of a phenylene sulfide ketone part in the second step by using the reaction solution. CONSTITUTION:An aprotic polar organic solvent (e.g., N-methyl-2-pyrrolidone) containing a dihalobenzene (e.g., p-dichlorobenzene) and an alkali metal sulfide (e.g., sodium sulfide) is heated to form a reaction solution containing a polyphenylene sulfide (step 1). A dihaloaromatic ketone (e.g., 4,4'- dichlorobenzophenone) is added to this reaction solution, and the obtained mixture is heated in the presence of an alkali metal sulfide and an aprotic polar organic solvent to form a block copolymer (step 2). Thus, a block copolymer comprising a polyphenylene sulfide part and a polyphenylene sulfide ketone part can be obtained, and this copolymer is excellent in heat resistance. |
