Process for preparing porous film or sheet.

摘要

process for preparing a porous film or sheet, which process comprises melt-forming a composition into a film or sheet and then stretching the thus-formed film or sheet at a temperature in the range of 30° to 110°C, said composition containing:
(a) 30-90% by weight of a linear low-density polyethylene having a density not smaller than 0.910 g/cm3 and smaller than 0.940 g/cm3;(b) 10-70% by weight of an ethyleneia-olefin copolymer having a density not smaller than 0.860 g/cm3 and smaller than 0.910 g/cm3, a boiling n-hexane insolubles content not less than 10% by weight and a maximum peak temperature not lower than 100°C as measured according to a differential scanning calorimetry; and(c) 20-500 parts by weight of a filler based on 100 parts by weight of said resin components.