Porous film

Details Porous film Porous film

1990-01-26

1991-05-14

Foelak, Morton

Stock material or miscellaneous articles

Structurally defined web or sheet

Physical dimension specified

521134, 521143, B32B 324, C08J 900

Patent

active

050155210

ABSTRACT:
Disclosed herein is a porous film having a thickness of 90 .mu.m or less obtained by uniaxially stretching a film produced by blow-extruding a composition comprising a linear polyethylene, 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/m.sup.2 .multidot.24 hr or above, and the surface strength of the porous film satisfying the following relation (I):

REFERENCES:
patent: 3705812 (1987-11-01), Ito et al.
patent: 3870593 (1975-03-01), Elton et al.
patent: 4705813 (1987-11-01), Ito et al.
patent: 4791144 (1988-12-01), Nagou et al.
patent: 4793956 (1988-12-01), Nogiwa et al.

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