Konishiroku Photo Industry Co., Ltd.

Sankyo Company, Limited

Tsuneo Wada

Takashi Sasaki

Teiji Habu

Hiroki Ishii

Hiroyuki Takagiwa

Sadatugu Terada

Kiyoshi Tamaki

Hideki Murata

Hisashi Yamaguchi

Takayoshi Omura

Akitoshi Matsubara

Hiroyuki Inokuma

Akira Kinoshita

Hiroyuki Nomori

Yoshiaki Takei

Satoshi Goto

Takahira Kasuya

Goichi Yamakawa

Shinobu Korematsu

Masayuki Matsumoto

Keiji Sato

Kouji Tokitou

Naoko Akashi

Shinichi Nakamura

Makoto Tomono

Toyoaki Masukawa

Mitsuto Fujiwhara

Yoshihiko Hyosu

Syunji Matsuo

Kunio Ito

Isao Kawamoto

Nobuo Soma

Katsuo Mogaki

Naoto Abe

Tomio Nakajima

Ken-ichi Kishi

Sadayasu Miyahara

Shizuo Saito

Saburo Wakimoto

Shigemasa Itoh

Keiji Oishi

Koichi Horigome

Akio Iijima

Masahide Tamura

Takayosi Omura

Sadao Sugita

Yukio Morifuji

Shinji Shimano

Takayoshi Ohmura

Seiji Kurihara

Tetsumasa Ishida

Shinobu Koremotsu

Kenzi Thuzita

Toner for developing electrostatically charged images comprising nuclear particles formed by polymerization, hydrophobic silica, and a resin, wherein said resin is coated on said nuclear particles and said silica is dispersed in said resin. A method for producing said toner is also disclosed, said method comprising polymerizing nuclear particles, dissolving a resin in a solvent, which asserts a lesser solvating action against said nuclear particles than against said resin, to form a solution, dispersing said hydrophobic silica in said solution, mixing said nuclear particles with said dispersion, and drying said mixture.

Triboelectric stabilized toner for developing electrically charged

A developer for developing an electrostatic latent image comprising colored electroscopic particles and at least one silicon dioxide powder having its particles made hydrophobic with a specified organosilicon compound is disclosed. Silicon atoms in said organosilicon compound are bonded to silicon atoms on the surface of individual silicon dioxide particles through oxygen atoms. At least one organic group in the organosilicon compound has a total carbon number of 8 or more and is a saturated or unsaturated aliphatic organic group with at least 5 carbon atoms or an organic compound having a hydrocarbon ring. In a preferred embodiment, such a silicon dioxide powder is used in combination with another silicon dioxide powder whose particles are rendered hydrophobic by an organosilicon compound wherein any of the organic groups present has a total carbon number of 7 or less and is a saturated or unsaturated organic group with not more than 4 carbon atoms or an organic group having a hydrocarbon ring.

Developer for electrostatic latent image and method of forming image

There are disclosed an electrostatic image developer which comprises a carrier comprising iron powder particles coated with a resin and a toner comprising a low molecular weight polypropylene, and an electrostatic image developer which further comprises as binder a homopolymer of a styrene or a copolymer of a styrene with an another vinyl monomer containing 10 to 70% by weight of a high molecular component having a molecular weight of 100,000 to 10,000,000. The electrostatic image developer of the present invention can accomplish good developing without forming fogging even when provided in a great number of developments, thus exhibiting a great durability, and is also free from image contamination by the off-set phenomenon to give an excellent copied image.

Developer composition for developing an electrostatic image

The invention relates to a method for producing a toner by polymerizing an aqueous suspension of a monomer in the presence of a dispersant selected from orthophosphate, pyrophosphate and polyphosphate, a colorant and an anionic surfactant. The polymerization product is then treated with dilute acid and rinsed with water whereby the dispersant is removed from the polymerization product.

Method for the production of toner for electrophotography and the toner

Herein disclosed are a toner composition for the development of electrostatic latent images which comprises a polymer obtained by polymerizing a polymerizable monomer or monomers in the presence of a chlorinated polyolefin, and a method for preparing the same.

Toner composition for the development of electrostatic latent images and

A process for manufacturing towers and their use in developing an electrostatically charged image comprising polymerized grains formed by the suspension polymerization of an alpha-beta unsaturated polymeric monomer or monomers in the presence of a dispersion stabilizer selected from the group consisting of aluminum hydroxide, ferric hydroxide titanium hydroxide and thorium hydroxide.

Toner for developing an electrostatically charged image and

An electrophotographic photosensitive element having a conductive support provided thereon with a photosensitive layer comprising (i) a carrier-generating phase layer containing a carrier-generating material selected from the group consisting of perylene dyes, polycyclic quinones and azo dyes and (ii) a carrier-transporting phase layer containing a carrier-transporting material wherein said carrier-transporting phase comprises a hydrazone compound represented by the formula ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 each represent an aryl group which may have a substituent or substituents, and Ar represents an arylene group which may have a substituent or substituents.

Layered electrophotographic photosensitive element having hydrazone

An electrostatic image developing toner comprising polymer particles produced by suspension polymerization of a polymerizable monomer in the presence of an emulsification-preventing agent. Such toners produce images of high image density.

Electrostatic image developing toner and a method for the production

An electrophotographic photosensitive element having a conductive support provided thereon with a photosensitive layer comprising a carrier-generating phase and a carrier-transporting phase. The carrier-transporting phase comprises a hydrazone compound to improve carrier-transporting ability having the formula ##STR1## wherein, X and Y each represent a hydrogen or a halogen, R.sub.1 and R.sub.2 each represent an aryl group which may have a substituent or substituents, and Ar represents an arylene group which may have a substituent or substituents.

In the process for preparing impregnated polymer latex compositions by impregnating a hydrophobic substance in dispersed polymer particles in an aqueous polymer latex, the improvement comprises impregnating said hydrophobic substance, wherein the impregnation is effected by mixing said hydrophobic substance which is solid state, a water-miscible organic solvent and aqueous polymer latex wherein a polymer of the polymer latex is prepared from ethene monomers and containing at least one hydrophilic group.

Process for preparing impregnated polymer latex compositions

A silver halide photographic material having a hydrophilic colloid layer comprising fine polymer particles loaded with a hydrophobic photographic addenda provided on a support wherein the polymer has repeating units formed from a nonionic hydrophobic monomer. The nonionic hydrophobic monomer has the formula ##STR1## R.sub.1 and R.sub.2 individually are a hydrogen atom or methyl group, R.sub.3 is a hydrogen atom, an alkyl or aryl group, and m and n are integers of from 2 to 100 individually.

Silver halide photographic material

A color photographic material comprising, on a support, a silver halide emulsion layer which contains a 2-equivalent .alpha.-acylacetamide yellow coupler carrying a nitrogen-containing heterocyclic coupling off group, joined to a nitrogen atom, as being releasable upon the reaction with an oxidation product of a color developing agent and a compound of the following formula (I) or its tautomer: ##STR1## wherein X and Y are as herein defined, is described.

Color photographic materials

Gelatin, especially in a layer of a light-sensitive silver halide photographic material, is hardened with the reaction product of a compound having at least three vinylsulfonyl groups in the molecule and a compound having at least one water-soluble group and at least one group capable of reacting with the vinylsulfonyl group, such as --SH, .dbd.NH and --NH.sub.2.

Gelatino silver halide photographic material hardened with a reaction

Gelatin, particularly gelatin films of light-sensitive silver halide photographic materials, are hardened by treating with a combination of a compound having at least two vinylcarbonyl groups in the molecule with a compound having at least two vinylsulfonyl groups in the molecule.

Method for hardening gelatin

A photographic element comprising a support and a gelatin-containing layer coated thereon which contains gelatin having been hardened with a compound having in the molecular structure an aliphatic hydrocarbon chain to which at least 3 vinyl sulfonyl groups are bonded.

Silver halide photographic element containing a gelatinous layer

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Hino, Japan

Tsuneo Wada