Method for preparing oriented microporous film

Details Method for preparing oriented microporous film Method for preparing oriented microporous film

1991-08-30

1993-08-24

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

264154, 264204, 2642107, 2642356, 2642888, 2642902, 264344, B29C 6720

Patent

active

052386180

ABSTRACT:
A method for preparing an oriented microporous shaped article is provided. The method comprises the steps of melt blending thermoplastic polymer with a solubilizing amount of a compatible liquid to form a homogeneous solution, forming a shaped article from the solution, cooling the shaped article at a rate and to a temperature sufficient to initiate thermodynamic, non-equilibrium liquid-liquid phase separation and then to solidify the thermoplastic polymer, stretching the article in a first direction sufficient to permanently attenuate the article and effect orientation of the polymer, and removing at least a substantial portion of the compatible liquid before or after the stretching step to form an oriented microporous shaped article.

REFERENCES:
patent: 3709774 (1973-01-01), Kimura
patent: 4220543 (1980-09-01), Yamashita
patent: 4377616 (1983-03-01), Ashcraft et al.
patent: 4466931 (1984-08-01), Tanny
patent: 4490431 (1984-12-01), Vitzthum
patent: 4612148 (1986-09-01), Motooka et al.
patent: 4774039 (1988-09-01), Urasiolo

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