Kasei Optonix, Ltd.

Dai Nippon Toryo Co., Ltd.

Hitachi, Ltd.

Dai Nippon Toryo Kabushiki Kaisha

Kazuhito Iwasaki

Shusaku Eguchi

Katuzo Kanda

Noboru Kotera

Hideo Tono

Toshio Jinnai

Thihiro Yoshida

Seiji Murakami

Toshiaki Hatsumi

Isao Iwamoto

Yoichi Oba

Kazuo Totani

Susumu Omatoi

Goro Matusmoto

Youji Tukihashi

Goro Matsumoto

Hidenaga Horiuchi

Method for preparing rare earth oxysulfide phosphor

A phosphor comprising phosphor particles and a surface treating material attached or coated on the phosphor particles, wherein said surface treating material comprises zinc and a polycarboxylic acid.

Phosphors, method for treating the surface thereof and process for

Electron-beam existed display tube, the screen of which has a

Pigment coated phosphors comprising a europium activated yttrium oxysulfide phosphor having a europium activator value within a range of 0.04 gram atom to 0.066 gram atom per 1 mol of yttrium oxysulfide having adhered thereto red colored pigment particles such as cadmium sulfoselenide pigment particles, rouge pigment particles or red lead pigment particles, in respective amounts of 0.1 to 2.0 wt %, 0.05 to 2.0 wt % or 0.1 to 12 wt %, based upon the europium activated yttrium oxysulfide phosphor; and a cathode ray tube for high contrast color television using as a red emitting phosphor at least one of the three pigment coated phosphors.

Pigment coated phosphor and high contrast color television cathode ray

A pigment-coated phosphor having good finish sieve passability and capable of forming a fluorescent film with excellent properties can be produced from a process characterized by:

Process for producing pigment-coated phosphors

A pigment coated phosphor used as a green emitting phosphor for a high contrast color television cathode ray tube. A green emitting phosphor is coated with TiO.sub.2 --ZnO--CoO--NiO system pigment particles.

Pigment coated phosphor

On the surface of a phosphor, pigment particles are uniformly adhered by a layer of a gelatin-gum arabic mixture. A process for manufacturing such a pigment coated phosphor includes the steps of preparing an aqueous solution of gelatin and an aqueous solution of gum arabic, allowing the phosphor to disperse homogeneously into one of these aqueous solutions, allowing the pigment particles to disperse homogeneously into the other aqueous solution, and mixing the so obtained phosphor and pigment dispersions.

Pigment coated phosphor and process for manufacturing the same

Liquid crystalline p-cyanocinnamic acid p'-n-alkoxyphenyl esters, and nematic liquid crystal compositions containing the same, useful for electro-optical devices, are described.

Liquid crystal compositions containing cyanocinnamic acid esters

Nematic liquid crystal compositions having positive dielectric anisotropy are obtained by mixing at least one of p-n-alkylphenyl-p'-cyanobenzoates represented by the formula, ##STR1## wherein R.sub.2 is n-alkyl group of 3 to 8 carbon atoms with at least one of p-cyanophenyl-p'-n-alkylbenzoates represented by the formula, ##STR2## wherein R.sub.1 is n-alkyl group of 4 to 8 carbon atoms. Said compositions exhibit nematic liquid crystal phase over a broad temperature range and therefore, are useful for the torsion effect-type display device.

Nematic liquid crystal compositions

Growing community of inventors

Odawara, Japan

Kazuhito Iwasaki