Process for producing porous films involving a stretching step a

Details Process for producing porous films involving a stretching step a Process for producing porous films involving a stretching step a

1984-12-14

1987-11-10

Anderson, Philip

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

264 41, 264147, 264154, 2642888, 2642902, 264DIG13, 521143, B29C 6720, B29C 5510

Patent

active

047058129

ABSTRACT:
A process for producing porous films which comprises melting a resin composition consisting essentially of (1) 100 parts by weight of a high-pressure-processed low-density polyethylene resin having a melt index of 0.5 to 7 and a density of 0.915 to 0.935, a linear low-density polyethylene resin having a melt index of 0.5 to 8.5 and a density of 0.915 to 0.935, or a mixture thereof and (2) 50 to 500 parts by weight of barium sulfate having an average particle diameter of 0.1 to 7 .mu.m; forming the molten resin composition into a film; and then stretching the film at least uniaxially by a factor of 1.5 to 7. As the linear low-density polyethylene resin, a copolymer of ethylene and hexene and/or octene is particularly preferred.

REFERENCES:
patent: 4472328 (1984-09-01), Sugimoto et al.
The Encyclopedia of Patent Practice and Invention Management, Robert Calvert, BDT, New York, Reinhold, .COPYRGT.1964, pp. 151-153.

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