Process for making microporous products and the products thereof

Details Process for making microporous products and the products thereof Process for making microporous products and the products thereof

1988-07-01

1990-04-24

Van Balen, William J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including aperture

2642888, 4283044, 4283155, 4283184, 428419, B32B 326, B32B 3100

Patent

active

049199927

ABSTRACT:
A process of producing a structural network from a semicrystalline, melt crystallizable polyarylene ether or polyarylene thioether comprising providing a molten mixture of at least one semicrystalline polymer in the presence of a melt plasticizer for the polymer which melt contains at least some polymer entities having a crystalline form, the total polymer concentration being between 5 and 50% by weight of the mixture of polymer and melt plasticizer, and heating the mixture of polymer and melt plasticizer at a heating rate of between 1.degree. C./hour and 1000.degree. C./hr, preferably between 10.degree. C./hour and 100.degree. C./hour until the mixture is at a temperature in the range 10.degree. C. below to 20.degree. C. above its clearing point and cooling the mixture until it solidifies whereby an open cell structure essentially free from granular superstructure is obtained.

REFERENCES:
patent: 3892425 (1975-07-01), Sakairi et al.
patent: 4613544 (1986-09-01), Burleigh

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