申请人:MITSUBISHI KASEI CORPORATION
公开号:EP0380353A2
公开(公告)日:1990-08-01
Disclosed herein is a porous film having a thickness of 90 µm or less obtained by uniaxially stretching a film produced by blow-extruding a composition comprising a linear polyethylene, a filler and a radical forming agent, the bending resistance of the porous film in both the machine and transverse directions being 50 mm or less, the moisture permeability of the porous film being 1500 g/m²·24hr or above, and the surface strength of the porous film satisfying the following relation (I):
Surface strength (kg) ≧ 35 x film thickness (mm) (I)
and the process for producing the porous film defined above.
本文公开了一种多孔薄膜,其厚度为 90 微米或以下,该薄膜是通过单轴拉伸由线性聚乙烯、填料和自由基形成剂组成的组合物吹挤出制得的,多孔薄膜在机器方向和横向的弯曲阻力均为 50 毫米或以下,多孔薄膜的透湿性为 1500 克/平方米-24 小时或以上,多孔薄膜的表面强度满足以下关系式 (I):
表面强度(公斤)≧ 35 x 薄膜厚度(毫米) (I)
以及上述多孔质薄膜的生产工艺。