Process for the production of a porous film having high bursting

Details Process for the production of a porous film having high bursting Process for the production of a porous film having high bursting

1994-08-08

1996-06-11

Wu, David W.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526352, 2642884, 2642902, C08F 1002, C08F11002

Patent

active

055256945

ABSTRACT:
Process for the production of a film having improved bursting strength by applying a recessed line pattern to a porous film produced from a solution of polyethene and from which the solvent has been removed, at a temperature below the melting point of the polyethene, and subsequently stretching the film biaxially with a degree of stretching of at least 2 x in each of the two directions, the surface area of the film increasing by at least a factor 8, and a porous film having high bursting strength.

REFERENCES:
patent: 4600633 (1986-07-01), Kono et al.
patent: 4824718 (1989-04-01), Hwang
patent: 4929303 (1990-05-01), Sheth

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