Fuji Xerox Co., Ltd.

Mitsui Chemicals, Inc.

Atsuhiko Eguchi

Chiaki Suzuki

Satoshi Inoue

Masahiro Takagi

Sakon Takahashi

Tomohito Nakajima

Yosuke Tsurumi

Takayoshi Aoki

Yasuhiro Oya

Kozo Ota

Fusako Kiyono

Masahiro Uchida

Haruhide Ishida

Kaori Ohishi

Rieko Kataoka

Jun Igarashi

Masahiro Okita

Yasuo Matsumura

Susumu Yoshino

Yoshifumi Iida

Koichi Sugiyama

Hiroshi Nakazawa

Hirokazu Hamano

Manabu Serizawa

Toshiyuki Yano

Takao Ishiyama

Yutaka Sugizaki

Yuka Ishihara

Takeshi Shoji

Akihiro Iizuka

Shinpei Takagi

Hideki Sakai

Hiroyuki Fukuda

Etsuo Tominaga

Tomohiro Takeda

Yusaku Shibuya

Teruo Sakai, Legal Representative

Toyohumi Inoue

Kouzou Ota

Takeo Kigami

Eiji Iwasaki

A toner having: a peak temperature before fixation Tof about 40&#xb0; C. or more; and a peak temperature after fixation Tthat is lower than Tby from about 10&#xb0; C. to about 35&#xb0; C.: Tbeing a peak temperature of an endothermic peak occurring at the lowest temperature in a range of from 0&#xb0; C. to 100&#xb0; C. and obtained at a first warming-up step of a differential scanning calorimetry measurement that uses a toner before fixation as a sample; Tbeing a peak temperature of an endothermic peak occurring at the lowest temperature within a range of from 0&#xb0; C. to 100&#xb0; C. and obtained at a first warming-up step of a differential scanning calorimetry measurement that uses a toner after fixation as a sample; and the toner after fixation being contained in a fixed image transferred from a transferring member and fixed on a recording medium, a maximum width of an image defect formed after conducting a folding test of the fixed image being 0.30 mm or less.

Toner for development of electrostatic image, electrostatic image developer, toner cartridge, process cartridge, and image forming apparatus

An electrophotographic toner contains at least a binder resin and a colorant, and log{[Cu]/[C]} satisfies the following equation (1):&#x2212;5.0&#x2266;log{[Cu]/[C]}&#x2266;&#x2212;3.5 &#x2003;&#x2003;(1)in which, [C] represents a carbon content (%) and [Cu] represents a copper content (%), measured with fluorescent X-ray. An electrophotographic developer containing the toner, a method for producing the toner, and a method for forming an image by using the toner are also provided.

Electrophotographic toner, process for producing the same, and process for forming image

The invention provides a toner for developing electrostatic charged images comprising toner mother particles containing a binder resin and a colorant, and an external additive, wherein: the average of shape factors SFof the toner mother particles represented by the following Formula (1) is 140 or less; the external additive contains higher alcohol particles having a volume-average particle diameter of 1 to 12 &#x3bc;m; and the content of the higher alcohol particles having a diameter equal to or less than the volume-average particle diameter of the toner mother particles is in a range of 0.15 to 2.5 parts by weight with respect to 100 parts by weight of the toner mother particles. In addition, the invention provides a developer for developing electrostatic charged images comprising the toner. Further, the invention provides an image forming method using the toner.

Toner for developing electrostatic charged images and developer for developing electrostatic charged images, and image forming method using the same

An image formation method which remarkably extends developer life while providing size reduction and high speed coloring. Also, a replenishing toner and a method of producing the same, and a toner cartridge. In the image formation method, conducting image formation by an image formation apparatus having a plurality of xerography units, the developer apparatus of at least one xerography unit has a developer recovering mechanism appropriately replenishing a replenishing toner composed of a toner and a carrier into the developer apparatus and recovering an excess portion of a developer from the equipment. The above-mentioned replenishing toner has a carrier content in the range of 5 to 40% by weight, the above-mentioned carrier is a carrier coated with a resin having a specific composition, and/or the above-mentioned toner is in a specific shape. The replenishing toner may be produced using the above-mentioned recovered developer.

Image formation method, replenishing toner used in this method and method of producing the same, and carrier-containing toner cartridge

A carrier for the development of an electrostatic latent image, comprising a core material and a resin coating the core material therewith, wherein the coating resin comprises a copolymer of at least four kinds of monomers including: (1) a monomer containing a carboxyl group; (2) an acrylic acid alkylester monomer or methacrylic acid alkylester monomer, containing a C -C linear alkyl group; (3) an acrylic acid alkylester monomer or methacrylic acid alkylester monomer, containing a C -C linear alkyl group or C -C branched alkyl group; and (4) a monomer containing fluorine. Also disclosed is a two-component developer for the development of an electrostatic latent image, comprising a toner and the carrier.

Carrier for development of electrostatic latent image, electrostatic latent image developer and image forming method

Electrophotographic toner, electrophotographic developer and process for forming image

A toner for developing an electrostatic latent image, a process for producing the same, and a developer for developing an electrostatic latent image using the same are provided, in which the toner flowability, the charging property, the developing property, the transferring property and the fixing property are simultaneously satisfied in a long period of time. The toner for developing an electrostatic latent image comprising a colored particles containing a binder resin, a coloring agent and a releasing agent, and an external additive, the external additive containing a monodisperse spherical inorganic oxide having a true specific gravity of from 1.3 to 1.9 and a volume average particle diameter of from 80 to 300 nm. It is preferred that the inorganic oxide is silica, the colored particles have a shape coefficient of 125 or less, and the external additive further contains a reaction product of metatitanic acid and a coupling agent, which has an electric resistance of 10 &OHgr;.cm or more.

Toner for developing electrostatic latent image, process for producing the same, developer for developing electrostatic latent image, and process for forming image

A toner for developing an electrostatic latent image, a process for producing the same, and a developer for developing an electrostatic latent image using the same are provided, in which the toner flowability, the charging property, the developing property, the transferring property and the fixing property are simultaneously satisfied in a long period of time. The toner for developing an electrostatic latent image comprising a colored particles containing a binder resin, a coloring agent and a releasing agent, and an external additive, the external additive containing a monodisperse spherical inorganic oxide having a true specific gravity of from 1.3 to 1.9 and a volume average particle diameter of from 80 to 300 nm. It is preferred that the inorganic oxide is silica, the colored particles have a shape coefficient of 125 or less, and the external additive further contains a reaction product of metatitanic acid and a coupling agent, which has an electric resistance of 10 &OHgr;&middot;cm or more.

Disclosed herein are a toner comprising a binder resin, a coloring agent, and, as a lubricant, a polyethylene wax having a penetration of 5 to 12 dmm and a melt viscosity of less than or equal to 1.5 at 130&deg; C., a process for the preparation thereof, a developer using the toner, and a method of forming images using the toner. According to the present invention, incomplete images in the transfer process can be prevented; excellent flowability is provided and the blocking phenomenon can be prevented; the transfer process can be carried out with less electric consumption. The offset resistance is also good, and the releasability is effectively exhibited at lower temperatures.

Toners, process for the preparation thereof, developers and method of forming images

It is to provide a toner for developing static charge and a process for producing the same that is excellent in peelability of the fixing sheet, adhesion of the fixed image, bending resistance of the fixed image, Dispersibility of the releasing agent in the toner and transparency on an OHP sheet, and can provide a high quality fixed image, as well as a developer and a process for forming an image. It relates to a toner for developing electrostatic charge of the invention including a coloring agent and a binder resin and a process for producing the same, wherein the relaxation modulus of elasticity G(t) at a relaxation time t=10.times.Dt (wherein Dt represents a heating time on fixing) obtained from measurement of dynamic viscoelasticity is adjusted to a range of from 2.0.times.10.sup.2 to 3.0.times.10.sup.3 Pa, or the relaxation modulus of elasticity G(t=0.01) at a relaxation time of 0.01 sec obtained from measurement of dynamic viscoelasticity is adjusted to a range of from 2.0.times.10.sup.2 to 3.0.times.10.sup.4 Pa, and the ratio G(r) (G(t=0.01)/G(t=0.1)) of the relaxation modulus of elasticity G(t=0.01) to a relaxation modulus of elasticity G(t=0.1) at a relaxation time of 0.1 sec is adjusted to a range of from 1.0 to 18.0, as well as a developer and a process for forming an image using the developer.

Toner for developing electrostatic charge and process for producing

The toner for developing an electrostatic charge image comprises a colorant, a binding resin and a resin copolymer of aliphatic hydrocarbon and aromatic hydrocarbon having 9 or more of carbon atoms. Preferably, the toner further comprises a wax. The endothermic peak of the wax at DSC is preferably from 70 to 100.degree. C. The petroleum resin copolymer preferably has a ring and ball softening point of from 80 to 170.degree. C., and the binding resin is preferably a polyester resin. The weight ratio of the aromatic hydrocarbon monomer and the aliphatic hydrocarbon monomer of the petroleum resin copolymer is preferably from 99:1 to 50:50.

Toner for developing an electrostatic charge image, developing agent for

A toner for developing electrostatic latent images containing a binder resin, a colorant, and a lubricant, wherein the lubricant comprises a modified polyethylene wax which is obtained by homopolymerizing ethylene or copolymerizing ethylene and an .alpha.-olefin having 3 to 10 carbon atoms in the presence of a metallocene catalyst and modifying the resulting homo- or copolymer by grafting thereto a styrene monomer and/or an unsaturated carboxylic acid monomer, the lubricant having a hexane extraction of not more than 65% by weight. The toner exhibits release properties at a lower temperature and thereby has satisfactory anti-offset properties without impairing powder fluidity and anti-blocking properties. It provides a toner image resistant against scratches by a peeling claw of a fixing roll part and against rub-of.

Toner for developing electrostatic latent images

An electrophotographic toner includes a binder resin including a linear polyester such as a polyester formed by condensation of an ethylene oxide adduct of a bisphenole A with a terephthalic acid, and a non-linear polyester such as a polyester formed by condensation of a mixture of an ethylene oxide adduct of a bisphenole A and a glycerin with a terephthalic acid; and, as a magnetic substance, a polyhedral magnetite of not more facets than a hexacosahedron and not less facets than a decahedron. The toner has an excellent fixing property at low temperature, an anti-offset property and a wide fixing latitude.

Electrophotographic toner and method for forming images

A image formation process comprising the steps of forming an electrostatic latent image on an electrostatic latent image carrier, developing the electrostatic latent image with a developer to provide a toner image, transferring the toner image to a transfer material, and heat-fixing the toner image on the transfer material, wherein the developer comprises a toner for developing electrostatic latent images comprising a binder, a colorant, and 1 to 30% by weight of a lubricant which comprises a modified polyethylene wax which is obtained by homopolymerizing ethylene or copolymerizing ethylene and an .alpha.-olefin having 3 to 10 carbon atoms in the presence of a metallocene catalyst and modifying the resulting ethylene homo- or copolymer by grafting at least one grafting monomer selected from the group consisting of a styrene monomer and an unsaturated carboxylic acid monomer, and has a hexane extraction of not more than 65% by weight, and wherein the transfer step comprises bringing a bias roll into contact with the back side of a transfer material. The image formation process of the present invention requires less power consumption. The toner for use in the present invention provides a good releasability at low temperatures and shows excellent anti-offset properties and powder fluidity without causing the generation of ozone, image defects and blocking.

Image formation process

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Minami-ashigara, Japan

Atsuhiko Eguchi