Process for producing microporous ultra-high-molecular-weight po

Details Process for producing microporous ultra-high-molecular-weight po Process for producing microporous ultra-high-molecular-weight po

1988-07-22

1989-10-10

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

21050036, 2642104, 26421119, 2642888, 2642893, 2642896, 2642902, 264344, B29C 4778, B29C 5504, B29C 5512, C08J 928

Patent

active

048730343

ABSTRACT:
A process for producing a relatively thick microporous ultra-high-molecular-weight polyolefin membrane, including the steps of: (1) preparing a solution of an ultra-high-molecular-weight polyolefin having a weight-average molecular weight of 5.times.10.sup.5 or more; (b) extruding the solution from a die while rapidly cooling it in advance to its gelation temperature or below, thereby forming a gel-like sheet; (c) removing at least 10 wt % of the solvent from the gel-like sheet so that the gel-like sheet contains 10 to 90 wt % of the ultra-high-molecular-weight polyolefin; (d) stretching the gel-like sheet at a temperature equal to or lower than that which is 10.degree. C. above the melting point of the ultra-high-molecular-weight polyolefin; and (e) removing the residual solvent from the stretched product.

REFERENCES:
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patent: 4472328 (1984-09-01), Sugimoto et al.
patent: 4551296 (1985-11-01), Kavesh et al.
patent: 4588633 (1986-05-01), Kono et al.
patent: 4620955 (1986-11-01), Kono et al.
patent: 4734196 (1988-03-01), Kono et al.

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