| 摘要 |
PURPOSE:To obtain porous polyolefin hollow yarn excellent in heat resistance and hydrophilicity, by introducing a crosslinking structure into polyolefin to set the apparent m.p. to a specific temp. and forming a membrane comprising a hydrophilic water-insoluble polymer to a minute pore forming wall. CONSTITUTION:The irradiation of electron beam is applied to a polyethylene porous hollow yarn, wherein minute pores are formed between a large number of fibriles arranged in the longitudinal direction of the hollow yarn communicating the inner and outer wall surfaces of the hollow yarn, to introduce a crosslinking structure into the hollow yarn to set the apparent m.p. thereof to 150-250 deg.C. Next, this hollow yarn is immersed in an org. solvent solution of a water-insoluble org. polymer having hydrophilicity such as cellulose acetate and subsequently subjected to rapid coagulation treatment to form a water- insoluble org. polymer membrane so as to adhere the same to the wall surfaces having minute pores formed thereto of the porous hollow yarn. |
