| 摘要 |
PURPOSE:To obtain the subject fiber useful for battery separator by blending PVC with polymethylmethacrylate and polysulfone at a specific ratio and spinning the dope obtained by dissolving the blend in DMF, etc., into a coagulation bath. CONSTITUTION:A spinning dope obtained by blending 20 to 40wt.% PVC having 800-2500 polymerization degree is with 20 to 65wt.% polymethylmethacrylate and 15 to 40wt.% polysulfone and dissolving and dispersing the blend into a solvent selected from a group of dimethylacetoamide, DMF, dimethylsulfoxide and acetone is spun into a coagulation bath consisting of 20-60% non-solvent and 80 to 40% same solvent as the solvent used in the spinning dope to provide the objective fiber being <=1.5% in fiber reduced amount after treating in 30% KOH aqueous solution under ordinary pressure and boiling condition for 1hr, <=2.5% in boiling water shrinkage and >=1.2g/d in strength of fiber. |
