Rikagaku Kenkyusho

Kureha Kagaku Kogyo Kabushiki Kaisha

Kyowa Hakko Kogyo Co., Ltd.

Takeo Furukawa

Munehiro Date

Eiichi Fukada

Ken'ichi Nakamura

Toshiaki Takamatsu

Yukio Inaba

A process for forming a porous polymer film formed by allowing a solvent to evaporate from a solution of polymer containing water and alcohol. It is possible to form a porous polymer film in which the size and distribution of the pores are uniformalized. Also described is a process for producing a composite film in which the pores of the porous polymer film are filled with a functional low molecular substance such as liquid crystal or dye so that the dispersion diameter of the functional low molecular substance and the distribution of the same are uniformalized. In the production of the above-mentioned porous polymer film, the size of the pores on the porous polymer film can be controlled by controlling the humidity of the forming atmosphere or the water content in the solution of polymer. It is therefore possible to obtain a fixed film having superior electrical and optical characteristics, by forming a composite film through filling the pores of the thus obtained porous polymer film with a functional low molecular substance such as liquid crystal or dye and providing electrodes on the composite film.

Processes for producing porous polymer films and composite films

A process for preparing polyvinylidene fluoride type (PVDF) films having highly stable piezoelectricity and pyroelectricity, by stretching PVDF films, while causing corona discharge, across the electric field formed by discharging, to effect thereby to polarization of film.

Piezoelectric and pyroelectric polymer film and process for preparing

Growing community of inventors

Wako, Japan

Takeo Furukawa