Hitachi Chemical Company, Ltd.

Hitachi, Ltd.

Shigeo Tachiki

Nobuyuki Hayashi

Toshihiko Akahori

Atsushi Kakuta

Toshiaki Ishimaru

Yasunori Okada

Shozo Kasai

Yuichi Osada

Masahiro Abo

Mineo Nakano

Makoto Fujikura

Kouji Yamazaki

Masahiko Hiro

Yuji Kobayashi

Ikutoshi Shibuya

Syoichi Sasaki

Yoichi Kimura

Tohru Kikuchi

Yasunori Kojima

Mitsumasa Kojima

Kuniaki Sato

Tsutomu Satoh

Takuro Kato

A color filter having excellent optical properties can be produced in high yield using a photo-sensitive composition comprising (a) a resin, (b) one or more pigments, (c) one or more monomers, and (d) a photoinitiator to form a film on a substrate, followed by exposure to light and development using a specific developer containing ##STR1## wherein R.sup.1 is C.sub.1-19 alkyl; and R.sup.2 is C.sub.1-19 alkylene.

Production of color filter

In a colored image forming material comprising (a) a copolymer containing a carboxyl group, (b) a coloring agent, (c) a monomer containing at least one photopolymerizable unsaturated bond in the molecule, (d) a photoinitiator and, when required, (e) a specific sensitizer, the dispersion stability of pigment and the optical sensitivity can be considerably increased by using a specific copolymer of styrene derivative-maleic acid derivative as component (a) and specific benzoimidazole or benzothiazole as component (e), and a photosensitive element or a color filter with distinguished optical characteristics can be obtained therefrom.

Colored image forming material and color filter obtained therefrom

A photosensitive resin composition comprising (a) a compound having a group unstable to acids, (b) a compound generating an acid when exposed to actinic light, and (c) a benzotriazole derivative is suitable for forming a positive type photosensitive anionic electrodeposition coating material and is usable for producing printed circuit boards.

Positive type photosensitive anionic electrodeposition coating resin

A photosensitive resin composition comprising (A) a polymer obtained by reacting an isocyanate compound having an ethylenic unsaturated group with a polymer which is a reaction product of a tetracarboxylic acid dianhydride and a diamine, and (B) a photoinitiator, can provide a thick film excellent in heat resistant, adhesiveness, flexibility, electrical and mechanical properties, and is particularly suitable for producing a photosensitive element.

Photosensitive resin composition and photosensitive element using the

A resin composition comprising (A) a copolymer obtained by copolymerizing (a) acrylic acid and/or methacrylic acid, (b) at least one compound having an unstable group against an acid such as t-amyl acrylate, t-amyl methacrylate, etc. and (c) a copolymerizable monomer such as n-butyl acrylate and (B) a photoacid generator is effective for providing an electro-deposition bath good in water dispersion stability and an electrodeposited film having high sensitivity and high resolution.

An electrophotographic plate comprising an electroconductive layer, a charge generating layer and a charge transport layer and containing a silane coupling agent at least in the charge generating layer or in the charge transport layer, or at the interface of the charge generating layer and the charge transport layer shows small dark decay, little light fatigue and high sensitivity.

Electrophotographic plate having a charge generating layer containing an

A flexible printed-circuit board is covered imagewise with a polymer film as a cover layer to improve the flexibility of the board. The cover layer is formed by laminating a photoprintable, photosensitive layer supported on a flexible support to the surface of a flexible printed-circuit board, exposing the photosensitive layer imagewise to light to form a polymer image in the layer and removing the unexposed areas of the layer to leave an imaged polymer film on the surface of the board. The formation of the cover layer can be easily conducted by a continuous operation.

Process for preparing flexible printed-circuit board

A polyester resin, polyester-imide resin or polyester-amide-imide resin dissolved in a solvent containing 60% by weight or more of at least one polyhydric alcohol derivative selected from the group consisting of R.sub.1 COO(CHR.sub.2 CH.sub.2 O).sub.n H, R.sub.1 COO(CHR.sub.2 CH.sub.2 O).sub.n COR.sub.3, R.sub.1 O(CHR.sub.2 CH.sub.2 O).sub.n COR.sub.3 and R.sub.1 O(CHR.sub.2 CH.sub.2 O).sub.n R.sub.4, wherein R.sub.1, R.sub.3 and R.sub.4 are independently lower alkyl, aryl or aralkyl; R.sub.2 is hydrogen or methyl; and n is an integer of 1 to 3, gives an electrical insulating coating having excellent storage stability and high resin concentration without causing defects of phenols when used as a solvent.

Electrical insulating coatings

An electrical insulating resin composition comprising a resin obtained by reacting (a) one or more tri- or higher polyhydric alcohols and/or tri- or higher polybasic acids, (b) one or more dihydric alcohols, (c) one or more dibasic acids, (d) one or more monobasic acids containing one or more aromatic rings in the molecule, and/or (e) one or more monohydric alcohols containing one or more aromatic rings in the molecule, and if desired (f) one or more compounds containing or being able to form one or more 5-membered imide rings, can give high solids varnishes without lowering the molecular weight of the resin produced. Said varnishes can give coating films excellent in heat resistance, flexibility and mechanical strengths.

Growing community of inventors

Hitachi, Japan

Shigeo Tachiki