| 摘要 |
PURPOSE:To obtain a cellular sintered body, having preferred voids and excellent in dimensional stability, heat, chemical resistance, etc., with a low molding shrinkage factor by heat-treating powder of a polyarylene sulfide under specific temperature conditions, then heating and sintering the resultant heat-treated powder. CONSTITUTION:A cellular sintered body obtained by heat-treating (A) powder of a substantially linear polyarylene sulfide having 500 to 5X10<4>P, preferably 10<3> to 10<4>P melt viscosity (at 310 deg.C and 1200/sec shearing rate), preferably a block copolymer, etc., composed of 50-95mol% recurring units expressed by formula I and 5-50mol% blocks expressed by formula II at a temperature above the melting crystallization temperature and below the melting point for 0.5-600min and having 2X10<3> to 10<5>P, preferably 3X10<3> to 7X10<4>P, heating and sintering the resultant heat-treated powder (B) at a temperature above the softening temperature and below the decomposition temperature and preferably further heat-setting the sintered body at a temperature below the melting point. |
