| abstract |
PCT No. PCT/JP89/00272 Sec. 371 Date Nov. 13, 1989 Sec. 102(e) Date Nov. 13, 1989 PCT Filed Mar. 14, 1989 PCT Pub. No. WO89/08488 PCT Pub. Date Sep. 21, 1989.A carbon based porous hollow fiber membrane excellent in heat resistance wherein it has pores which continuously penetrate from inner wall surface to outer wall surface of the membrane, maximum value of pore radius obtained from pore volume differential curve is in 10-1000 nm, total pore volume is 0.1-1 cm3/g, curvature radius at flexing is 10 cm or less, and temperature at which 10% by weight of the membrane is decomposed and which is measured by TGA is at least about 300 DEG C. and a method for producing the abovementioned carbon based porous hollow fiber membrane having excellent heat resistance, characterized by comprising mixing an acrylonitrile based polymer (A) containing 90-100 mol % of acrylonitrile unit, a heat decomposable polymer (B) which is heat decomposed at a temperature of 600 DEG C. or lower to become low in molecular weight, and a solvent (C), then spinning and drawing the mixture to obtain an acrylonitrile based hollow fiber, subjecting this hollow fiber to oxidizing treatment and then subjecting the hollow fiber to carbonizing treatment at 400 DEG C. or higher to make it porous. |