Method of making water vapor permeable polymer sheet material

Details Method of making water vapor permeable polymer sheet material Method of making water vapor permeable polymer sheet material

1975-02-05

1977-06-07

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 49, 264216, B29D 2704

Patent

active

040284514

ABSTRACT:
Coagulation apparatus for producing thick microporous polyurethane sheet material by passing a layer of polymer solvent composition beneath a close spaced plate with liquid non-solvent fed to the gap between the plate and the surface to produce controlled initiation of the coagulation.

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patent: 3524753 (1970-08-01), Sharp
patent: 3729536 (1973-04-01), Warwicker
patent: 3791997 (1974-02-01), Hathorn et al.
patent: 3860680 (1975-01-01), Warwicker et al.
patent: 3873254 (1975-03-01), Warwicker

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