Porous film and process for producing the same
AssigneeMitsui Chemicals, Inc.
InventorsShigeru Yano, Mindiaw Wang, Taroh Ichikawa
Life of this patent
Estimating the term…
Abstract
A porous film having excellent moisture permeability, flexibility and exudation resistance, as well as a manufacturing method capable of forming and stretching at high speed a porous film having the characteristics described above, the porous film being molded from a composition containing 25 to 55% by weight of polyolefinic resin and 75 to 45% by weight of an inorganic filler in which the polyolefinic resin contains 98 to 70% by weight of linear low density polyethylene and 2 to 30% by weight of branched low density polyethylene, and 0.5 to 5 parts by weight of liquid ethylene-α-olefin oligomer based on 100 parts by weight of the composition.
Claims7
A porous film molded from a composition comprising 25 to 55% by weight of polyolefinic resin and 75 to 45% by weight of inorganic filler, in which the polyolefinic resin comprises 98 to 70% by weight of linear low density polyethylene and 2 to 30% by weight of branched low density polyethylene, and wherein the composition further comprises 0.5 to 5 parts by weight of liquid ethylene-α-olefin oligomer based on 100 parts by weight of the composition, the porous film having a moisture permeability from 1500 to 4000 g/m2·24 hr. and a uniformness of thickness of 0.15 or less.
Dependencies are inferred from the claim text.