Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By treating occluded solids
Patent
1988-10-05
1989-10-10
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By treating occluded solids
264126, 264134, 264141, 264171, 26421112, 264320, 26433113, 26433115, 264344, 4274123, B05D 300, B29C 4330, B29C 4706, B32B 3100
Patent
active
048730378
ABSTRACT:
A method for preparing an asymmetric, semi-permeable membrane containing a uniform microporous structure for gas and liquid separation, including forming a dense separation on one major surface of a microporous support structure. The microporous support structure is initially formed as a solid unitary film, fiber or sheet by the simultaneous extrusion of at least two streams of heat-plastified polymeric materials including at least two differentially soluble polymeric materials. The separation layer can be formed on the support structure prior to or after the soluble polymeric material has been dissolved out of, as by leaching from the solid support structure to form the microporous support for the separation layer. Preparation in this manner greatly reduces the tendency to form undesiralbe pinholes in the membrane.
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Chau C. C.
Im Jang-hi
Raspor Otto C.
Tung Lu H.
Tentoni Leo B.
The Dow Chemical Company
Thurlow Jeffery
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