Ube Industries, Inc.

Sii Printek Inc.

Yoshiaki Watanabe

Makoto Matsuo

Hiroshi Shimazaki

Shyusei Ohya

Hiroshi Yasuno

Seiji Ishikawa

Shigeru Yamamoto

Yuuichi Fujii

Makoto Babazono

Hiroyuki Sakurai

Dai Yokoyama

A porous polyimide film having a three-layer structure that comprises two surface layers (a) and (b) and a macrovoid layer sandwiched between the surfaces layers (a) and (b). The macrovoid layer has a partition wall bonding to the surface layers (a) and (b), and multiple macrovoids each surrounded by the partition wall and the surface layers (a) and (b) and having a mean pore size in the film plane direction of from 10 to 500 &#x3bc;m. The partition wall of the macrovoid layer has a thickness of from 0.1 to 50 &#x3bc;m and has multiple pores having a mean pore size of from 0.01 to 50 &#x3bc;m. The surface layers (a) and (b) each have a thickness of from 0.1 to 50 &#x3bc;m, at least one of the surface layers has multiple pores having a mean pore size of from more than 5 &#x3bc;m to 200 &#x3bc;m, and the other surface layer has multiple pores having a mean pore size of from 0.01 to 200 &#x3bc;m. The pores in the partition wall of the macrovoid layer as well as in the surface layers (a) and (b) communicate with each other and further communicate with the macrovoids. The film has a total thickness of from 5 to 500 &#x3bc;m and a porosity of from 60 to 95%.

Porous polyimide membrane and process for production thereof

An imide-based photosensitive resin composition comprised of (1) a photosensitive imidosiloxane oligomer comprised of a reaction product of an imidosiloxane oligomer having a functional group reactive with an epoxy group and an epoxy compound having a photosensitive group, (2) an isocyanate having an unsaturated bond, (3) a photopolymerization initiator, and (4) an organic solvent, an insulating film obtained by curing the same, and a process for production of such an insulating film.

Photosensitive resin compositions, insulating films, and processes for formation of the films

There are provided an ink jet head and an ink jet recording apparatus having a judging unit for making a judgment with ease on an ink filling state of a printing head without consuming any ink and recording medium that are used for verification. A controlling means controls a selection means to drive one of side walls adjacently disposed in ink passages provided on a head chip and obtains a piezoelectric signal generated on the other one of the side walls from a signal processing means , to thereby judge the ink filling state in the ink passage.

Ink jet head and ink jet recording apparatus

A single-application polyimidosiloxane coating material comprising a uniformly mixed solution composition of a polyimidosiloxane with an epoxy resin-reactive group in the molecule, an epoxy resin and a fine inorganic filler in a solvent. The coating material has satisfactory storage stability and printing properties, and its cured films also have satisfactory properties and allow single-application printing.

Single-application polyimidosiloxane-based coating material and cured film

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Chiba, Japan

Yoshiaki Watanabe