Tokyo Ohka Kogyo Co., Ltd.

Mitsuharu Tobari

Tsukasa Sugawara

Masanori Ichikawa

Kaoru Ishikawa

Jun Koshiyama

Yoshitsugu Kawamura

Provided are a polyimide and/or polyamideimide porous body and method for manufacturing same, method for separation and/or adsorption using the porous body, a separation material, adsorption material, and filter media composed of the porous body, a laminate, and a filter device. A polyimide and/or polyamideimide porous body in which the polyimide and/or polyamideimide has at least one group selected from the group consisting of a carboxy group, a salt-type carboxy group, and a &#x2014;NH&#x2014; bond.

Polyimide and/or polyamideimide porous body and method for manufacturing same, method for separation and/or adsorption, separation material, adsorption material, filter media, laminate, and filter device

Provided are a varnish for porous polyimide film production, providing an unburned composite film that is less likely to have a sea-island structure, and a method for producing a porous polyimide film using the same. The varnish according to the present invention comprises a resin including polyamide acid and/or polyimide, fine particles, and a solvent, and has a fine particle content of not less than 65% by volume relative to the total of the resin and the fine particles and a viscosity at 25&#xb0; C. of not less than 550 mPa&#xb7;s. Preferably, the varnish further comprises a dispersant. The method for producing a porous polyimide film according to the present invention comprises: forming an unburned composite film using the varnish; burning the unburned composite film to obtain a polyimide-fine particle composite film; and removing the fine particles from the polyimide-fine particle composite film.

Varnish for porous polyimide film production and method for producing porous polyimide film using same

Provided is a method for producing a porous polyimide film with which it is possible to suppress the occurrence of curling in the polyimide-fine particle composite film obtained by firing the unfired composite film. The method for producing a porous polyimide film of the present invention includes, in the following order: forming an unfired composite film using a varnish that contains a resin including polyamide acid and/or polyimide, fine particles, and a solvent; immersing the unfired composite film in a solvent including water; firing the unfired composite film to obtain a polyimide-fine particle composite film; and removing the fine particles from the polyimide-fine particle composite film.

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Kanagawa, Japan

Mitsuharu Tobari