Konishiroku Photo Industry Co., Ltd.

Konica Corporation

Sekisui Chemical Co., Ltd.

Japan Synthetic Rubber Co., Ltd.

Makoto Tomono

Satoshi Haneda

Noriyoshi Tarumi

Masahiko Itaya

Goichi Yamakawa

Masayuki Sato

Ken Nakamura

Takahira Kasuya

Hideaki Morita

Takashi Itoh

Hirozo Funaki

Hiroyuki Takagiwa

Syunji Matsuo

Minoru Takahashi

Sadatugu Terada

Nobuo Takahashi

Isao Furuta

Shotaro Watanabe

Yutaka Yamada

Hiroshi Ogawara

Yasuyuki Fujisaki

Minoru Tsuneyoshi

Mitsunori Ohta

Takeo Nishimura

Kiyoshi Kimura

Hiroshi Tokunaga

Yukio Okamoto

Yoshihiko Hyosu

Tsuneo Wada

Shinichiro Yasuda

Koji Watanabe

Minoru Kohara

Ryubun Seimiya

Sadayasu Miyahara

Takashi Ito

Saburo Wakimoto

Hideaki Arai

Keiji Sato

Hiroshi Tokura

Ryubun Seimaya

Goiti Yamakawa

Tetsumasa Ishida

Masahiro Otsuka

Kenzi Thuzita

Akira Inoue

Koichi Yamakawa

A method of use of a toner for developing electrostatic images is disclosed which comprises a coloring agent, a styrene homopolymer or copolymer with a vinyl monomer or monomers, and polypropylene in an amount between about 0.02 and 40 parts by weight per 100 parts by weight of the styrene homopolymer or copolymer.

Toner for use in developing electrostatic images

A toner for developing electrostatic images is disclosed which comprises a coloring agent, a styrene homopolymer or copolymer with a vinyl monomer or monomers, and polypropylene in an amount between about 0.02 and 40 parts by weight per 100 parts by weight of the styrene homopolymer or copolymer.

Toners for use in developing electrostatic images

A toner for developing electrostatic images is disclosed which comprises a coloring agent, a styrene homopolymer or copolymer with a vinyl monomer or moners, and polypropylene in an amount between about 0.02 and 40 parts by weight per 100 parts by weight of the styrene homopolymer or copolymer.

The present invention relates to toners for electrophotography wherein the main resin component comprises a lower molecular weight polymer and a higher molecular weight polymer each of which is different from the other wherein the higher molecular weight polymer has a glass transition point of at least 50.degree. C. and the lower molecular weight polymer has a glass transition point no higher than 65.degree. C. The above polymers comprise one or more polymers selected from styrene polymers, arcylic polymers, and styrene-acrylic copolymers. Generally, the lower molecular weight polymer has a weight average molecular weight of 50,000 or less and the higher molecular weight polymer has a weight average molecular weight of 80,000 or more.

Toner for electrophotography

A toner for developing electrostatic images is disclosed which comprises a coloring agent, a styrene homopolymer or copolymer with a vinyl monomer or moners, and polypropylene having a number average molecular weight of about 3000 to 4000 in an amount between about 0.02 and 40 parts by weight per 100 parts by weight of the styrene homopolymer or copolymer.

Toner for use in developing electrostatic images containing polypropylene

A charging method of an electrostatic image developer which makes it possible to electrically charge an insulating one-component developer or a two-component developer consisting of a toner and a carrier to a desired charged state and which comprises introducing the developer into a charging space between a pair of sheet-like charging members opposing each other in which space an alternating field is formed, and oscillating the developer by means of the alternating field for charging it. A developing method of a non-contact or contact system which develops the electrostatic image by use of the developer charged electrically by the above-mentioned charging method.

Method of developing electrostatic images using two component developer

The present invention relates to toners for developing electrostatically charged images which are comprised of a polyester binder resin condensed from diols of the formula ##STR1## with a polyhydric carboxylic acid or a derivative thereof wherein the polyhydric carboxylic acid is a mixture of dihyridic carboxylic acid or its alkylesters and about 30 mole % to about 80 mole % of the total acid content of more hydric carboxylic acids or therein hydrids.

Toner for developing an electrostatically charged image

A developing method for an electrostatic latent image comprises the steps of applying and retaining a layer of developer on a supporting sleeve, conveying the developer on the supporting sleeve to a development area, and regulating the quantity of the developer on the supporting sleeve by a developer regulating device before the developer is conveyed to the development area. The regulating step includes impressing a bias voltage so as to establish a field between the supporting sleeve and the regulating device in order to selectively retain developer on the supporting sleeve which has a desired polarity and quantity of charge for development. The developer regulating device may be a sleeve rotated in a direction opposite to the direction of rotation of the supporting sleeve, and has a bias voltage impressed thereon.

Developing method for electrostatic latent image

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

An electrostatic image developing toner comprises a binder resin which contains at least 60% by weight of a styrene-butadiene copolymer. The copolymer contains a component A having a molecular weight of at least 100,000 in an amount of at least 20% by weight relative to the binder resin, and a component B having a molecular weight of at least 500,000 in the component A is not more than 15% by weight relative to the binder resin. The toner has adequate flowability and noncoagulation property and is capable of forming a superior visible image in a contact heat fixing system.

Electrostatic image forming toner

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Hino, Japan

Makoto Tomono