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    • 115. 发明公开
    • SUCCESSIVELY BIAXIAL-ORIENTED POROUS POLYPROPYLENE FILM AND PROCESS FOR PRODUCTION THEREOF
    • AUFEINANDERFOLGEND BIAXIAL AUSGERICHTETE,PORÖSEPOLYPROPYLENFOLIE UND VERFAHREN IHRER HERSTELLUNG
    • EP1369221A1
    • 2003-12-10
    • EP02712390.0
    • 2002-02-15
    • NEW JAPAN CHEMICAL CO.,LTD.
    • SADAMITSU, KiyoshiIKEDA, NaokiHOKI, ManabuNAGATA, KenichiroOGINO, Koichi
    • B29C55/14C08J9/00H01M2/16
    • C08J5/18B29C55/005B29C55/143B29K2023/12B29K2105/0005C08J2323/10H01M2/1653Y10T428/249978Y10T428/249979Y10T428/249986Y10T428/31909
    • Disclosed is a successively biaxially stretched film obtained by successive biaxial stretching method comprising extruding a melt of a β-crystal nucleating agent-containing polypropylene-based resin composition from a T-die, cooling the extruded resin on a chill roll, and stretching the resulting web sheet longitudinally and then transversely, wherein the longitudinally stretched sheet is made to have a degree of β-crystal orientation of less than 0.3 by the following method (I) and/or (II), optionally subjected to annealing treatment, and transversely stretched:

      method (I): melting the polypropylene-based resin composition containing needle crystals of a specific β-crystal nucleating agent at a temperature not lower than m.p. of the polypropylene-based resin and lower than dissolution temperature of the β-crystal nucleating agent in the polypropylene-based resin melt, and extruding the melt from the T-die at the same temperature,
      method (II): adjusting neck-in ratio during longitudinal stretching to 25 to 55%.

      The porous polypropylene film has good breakage resistance during manufacture, excellent thickness uniformity, high porosity and air-permeability, and is useful for battery separators.
    • 公开了通过连续双轴拉伸法获得的相继的双轴拉伸膜,包括从T模挤出含β-结晶成核剂的聚丙烯基树脂组合物的熔体,将挤出的树脂冷却在冷却辊上,并将所得的 网片纵向和横向,其中通过以下方法(I)和/或(II)使纵向拉伸的片材具有小于0.3的β-晶取向度,任选进行退火处理,并横向拉伸 :方法(I):在不低于mp的温度下熔融含有特定β-结晶成核剂的针状结晶的聚丙烯类树脂组合物 的聚丙烯类树脂,低于聚丙烯类树脂熔液中的β-晶体成核剂的溶解温度,并且在相同温度下从T模头挤出熔体,方法(II):调节镦粗比 在纵向拉伸至25〜55%。 多孔聚丙烯膜在制造时具有良好的耐破坏性,优异的厚度均匀性,高孔隙率和透气性,并且可用于电池隔板。