Sumitomo Chemical Company, Limited

Toshiki Furubayashi

Takuo Harato

Keisuke Ito

Kiyoharu Nakatsuka

Toru Ogawa

Toshio Ashitani

Kaori Yamamoto

Takeo Tokuda

Koji Tsujimoto

Toshinobu Yamashita

A coloring composition for a color filter, which comprises (i) an organic pigment, (ii) a binder, and (iii) a pigment derivative which is an organic pigment to which a sulfonate group and a sulfonamide group are bonded or a salt thereof, is provided, and using the coloring composition, a color filter which manifests excellent coat property, has not special color unevenness and has excellent contrast can be produced.

Coloring composition

A black coating composition comprising a light-screening material and a macromolecular material wherein the light-screening material consists of particles having a multiple particle size distribution has high light-screening properties, is excellent in storage stability, dispersion stability and coating efficiency, and is satisfactory in other characteristics required of the light-screening thin film of a color filter used in a liquid crystal display device or the like.

Black coating composition and application thereof

An aqueous slurry of about 100-1000 centipoises viscosity suspending about 200-2000 g/l of aluminum hydroxide particles smaller than 5 .mu.m is spray-dried, and the dried powders are calcined to obtain alumina powders. The alumina powders have a sharp particle size distribution, being suitable for electronic, abrasive and refractory applications.

Process for preparation of alumina

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Hyogo, Japan

Toshiki Furubayashi