Canon Kabushiki Kaisha

Copyer Kabushiki Kaisha

Masaaki Hiro

Toshiyuki Yoshihara

Masaru Nakagawa

Tomohiro Kimura

Yoichi Kawamorita

Noboru Kashimura

Shozo Ishikawa

Fumio Sumino

Masafumi Hisamura

Takao Takiguchi

Shoji Koike

Kazuharu Katagiri

Kenji Shinjo

Koromo Shirota

Masataka Yamashita

Koji Yamazaki

Yoshio Takasu

Shinichi Tochihara

Tetsuo Hasegawa

Hajime Miyazaki

Hideki Anayama

Junichi Sakai

Hideyuki Takai

Masakazu Matsumoto

Hisami Tanaka

Katsutoshi Misuda

Katsunori Watanabe

Shigemori Tanaka

Yuichi Yashiki

Shin Nagahara

Makiko Endo

Hideyuki Takahashi

Keishi Danjo

Hitoshi Tohma

The invention provides colored fine resin particles useful as coloring materials for inks which can provide images having good water fastness, weather fastness and rub-off resistance and are excellent in dispersion stability, and a production process thereof. The colored fine resin particles have a structure in which a pigment coated with a water-insoluble resin is encapsulated with a copolymer composed of at least a polymerizable unsaturated monomer and a reactive emulsifier.

Colored fine resin particles and production process thereof, aqueous dispersion of colored fine resin particles and production process of aqueous dispersion of colored fine resin particles, ink , ink cartridge, recording unit, ink-jet recording apparatus, and ink-jet recording process

Disclosed herein is a recording medium comprising a base material, and at least one resin selected from a primary amine resin and a secondary amine resin and a hindered amine compound contained in the base material and/or on the surface of the base material.

Recording medium and image forming process using the same

Aqueous pigment ink and organic pigment powder are used for ink-jet recording to form high quality images. Organic pigment powder is prepared by finely granulating an organic pigment containing anthraquinone as principal ingredient by means of a vapor phase method to such an extent that the produced powder shows a number average particle diameter of primary particles of 10 to 50 nm. An aqueous ink contains such organic pigment powder.

Aqueous ink, organic pigment powder, ink cartridge, recording unit and ink-jet recording apparatus

A packaging medium for an electrophotographic photosensitive member contains a conductive material and has a volume resistivity of not more than 10.sup.12 .OMEGA..cm.

Packaging medium for electrophotographic photosensitive member

A photosensitive member for electrophotography comprising: an electroconductive substrate and a photosensitive layer disposed thereon comprising an organic photoconductor is provided. the photosensitive layer contains at least, a compound represented by the following formula (I): ##STR1## wherein X.sub.1 denotes a t-butyl or t-amyl group, and X.sub.2 denotes a hydrogen atom, an alkyl group having 1-10 carbon atoms or an alkenyl group having 2-10 carbon atoms; and a compound represented by the following formula (II): ##STR2## wherein X.sub.3 and X.sub.4 respectively denote an alkyl group having 1-10 carbon atoms or an alkenyl group having 2-10 carbon atoms.

Photosensitive member for electrophotography

An electrophotographic photosensitive member having an electroconductive substrate and a photosensitive layer or layers contains pigment particles of 0.5 .mu. or below in size in an amount of 80% or more in weight or number of the total pigment. The particles of the above-mentioned size distribution are dispersed in a binder.

Electrophotographic photosensitive member having charge generator

An apparatus for preparing electrophotographic photosensitive members comprises a means for forming a charge generation layer by coating a charge generation layer coating solution containing two or more kinds of charge-generating materials having different maximum absorption wavelengths, wherein the apparatus further comprises a means for measuring absorbance or transmittance at the respective maximum absorption wavelengths of said coating solution to measure the mixing ratio of the respective charge-generating materials, and a means for controlling the mixing ratio by controlling the feed amount of the respective charge-generating materials.

Apparatus for preparing electrophotographic photosensitive members

An electrophotographic photosensitive member comprises a photosensitive layer containing an organic photoconductor provided on an electroconductive substrate, wherein said photosensitive layer contains a compound represented by the formula (1) shown below in an amount ranging from 0.1 to 10% by weight based on the total weight of the photosensitive layer added;

Electrophotographic photosensitive member

A photosensitive member for electrophotography which is excellent in successive copying characteristics as well as mechanical durability is provided. The photosensitive member comprises a photosensitive layer, at least the surface portion of which comprises a lubricant, and a charge-transporting substance having an oxidation potential of 0.6 volt or above.

An electrophotographic photosensitive member has a photosensitive layer on an electroconductive support, characterized in that the surface layer contains a fluorine type resin powder and a fluorine type block copolymer.

Electrophotographic member with the surface layer having a fluorine type

A packaging arrangement and method for the user thereof to protect an electrophotographic photosensitive member which includes a packaging material for covering and protecting the electrophotographic photosensitive member from physical damage and is capable of generating a frictional electrostatic charge of the same polarity as the electrophotographic photosensitive material, whereby the packaging material has a stronger electron acceptor characteristic than the electrophotographic photosensitive material where the electrophotographic photosensitive material possesses a positive charge, and the packaging material has a stronger electron donor characteristic than the electrophotographic photosensitive material where the electrophotographic photosensitive material possesses a negative charge.

Packaging arrangement for electrophotographic photosensitive member

An electrophotographic photosensitive member is provided which has an electroconductive substrate and a photosensitive layer, said photosensitive layer containing at least one of (I) polymethyl methacrylates having a molecular weight of 28.times.10.sup.4 or lower, preferably 1.0.times.10.sup.4 to 28.times.10.sup.4 and at least one of (II) polymethyl methacrylates having a molecular weight of 50.times.10.sup.4 to 250.times.10.sup.4, preferably 100.times.10.sup.4 to 250.times.10.sup.4, said polymethyl methacrylate (II) being contained at a proportion of 0.1 part by weight to 30 parts by weight in the composition consisting of the polymethyl methacrylates (I) and (II).

Electrophotographic photosensitive member with combination of polymethyl

An electrophotographic photosensitive member comprises a photosensitive layer on an electroconductive substrate, said photosensitive layer containing a polymer formed from a polymerizable monomer having, in the side chain, an aromatic ring substituted with fluorine atom as the constituent.

An electrophotographic photosensitive member having a photosensitive layer on an electroconductive substrate comprises a surface layer containing a fluorine type resin powder and a fluorine type graft polymer.

Electrophotographic member with surface layer having fluorine resin

The invention provides an electrophotographic photosensitive member having an improved sensitivity and an improved potential stability when repeatedly copied by using a photosensitive layer containing a disazo pigment having a specific molecular structure.

Growing community of inventors

Kanagawa, Japan

Masaaki Hiro