PROCESS FOR PRODUCING POROUS POLYMER MEMBRANE AND COMPOSITE POLYMER MEMBRANE

WIPO Patent Application WO/1989/008679

A1

Composite membranes of liquid crystal and/or dye and a polymer are expected to have various functions in addition to electro-optical effects and non-linear optical effects of the starting substances, and are promising as various industrial materials. Liquid crystal-polymer composite membranes produced by conventional processes do not have fully satisfactory electric and optical properties because the diameters of the low-molecular functional compounds and their distribution are nonuniform. A process for producing a porous polymer membrane by evaporating a solvent from a polymer solution containing water and alcohol according to this invention provides a porous polymer membrane having pores of a uniform size uniformly distributed therein. Furthermore a process for producing a composite membrane according to this invention comprises filling the pores of the porous polymer membrane with low-molecular functional compounds such as liquid crystal or dye to obtain a composite membrane wherein the low-molecular functional compoumd is uniformly distributed in a uniform size. In addition, in the case of producing the porous polymer membrane, the size of the pore of the polymer membrane can be controlled by controlling humidity of a highly humid environment or the amount of water in the polymer solution. Fixed membranes with excellent electric and optical properties can be obtained by providing electrodes in the composite membrane obtained by filling a low-molecular functional compound such as liquid crystal or dye in the pores of the obtained porous polymer membrane.

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JP2023126212	MEMBRANE MANUFACTURING WITH COSOLVENT IN POLYMER DOPE SOLUTION
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FURUKAWA TAKEO (JP)
INABA YUKIO (JP)

PCT/JP1989/000239

September 21, 1989

March 07, 1989

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RIKAGAKU KENKYUSHO (JP)
KYOWA HAKKO KOGYO KK (JP)

C08J9/28; (IPC1-7): C08J9/28

JPS5816823A	1983-01-31
JPS5790028A	1982-06-04
JPS6219203B2	1987-04-27
JPS4856279A	1973-08-07

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