Process for producing porous film or sheet
AssigneeMitsubishi Chemical Industries Limited
InventorsMasaaki Sugimoto, Yukio Watanabe, Kunio Bizen, Tsunemitsu Hasegawa, Masahiro Morita
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Abstract
A process for producing a porous film or sheet, which comprises melt-molding a composition prepared by compounding 100 parts by weight of a polyolefin resin with 25 to 400 parts by weight of a filler and 1 to 100 parts by weight of a liquid or waxy hydrocarbon polymer into film or sheet, and stretching the resulting film or sheet.
Claims5
A process for producing a porous film or sheet, which comprises melt-molding a composition prepared by compounding 100 parts by weight of at least one polyolefin resin selected from the group consisting of a linear low density polyethylene having a density of 0.91 or more, a high density polyethylene, and a polypropylene with 25 to 400 parts by weight of at least one filler having a mean particle size of not more than 30.mu. selected from the group consisting of inorganic fillers and cellulose type organic fillers and 1 to 100 parts by weight of at least one liquid hydrocarbon polymer, selected from the group consisting of liquid polybutene, liquid polybutadiene, and hydrogenated liquid polybutadiene having a saturated or mostly saturated main chain into a film or sheet, and stretching the resulting film or sheet.
Dependencies are inferred from the claim text.