Fuji Xerox Co., Ltd.

Yasuhiro Oya

Hirokazu Hamano

Haruhide Ishida

Susumu Yoshino

Masanobu Ninomiya

Tetsuya Taguchi

Koutarou Yoshihara

Atsuhiko Eguchi

Kaori Oishi

Akihiro Iizuka

Shinpei Takagi

Hidekazu Yaguchi

Jun Igarashi

Tomohiro Takeda

Satoshi Inoue

Atsushi Sugawara

Chiaki Suzuki

Sakon Takahashi

Masaru Takahashi

Fumiaki Mera

Daisuke Ishizuka

Noriyuki Mizutani

Yutaka Sugizaki

Michio Take

Masahiro Uchida

Masaki Nakamura

Hiroshi Takano

Kaori Ohishi

Rieko Kataoka

Sueko Sakai

Masahiro Okita

Etsuo Tominaga

Yuusaku Shibuya

Yusaku Shibuya

Toyohumi Inoue

Kouzou Ota

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

The invention provides: an electrostatic latent image developing toner comprising a non-crystalline resin, a crystalline resin having a melting point of 50 to 100&#xb0; C., and a colorant, and satisfying the relationship represented by the following formula (1), wherein A represents the content of the crystalline resin (% by mass) in the entire toner, and B represents the content of the crystalline resin (% by mass) in a classified toner which has been prepared by classifying the toner such that the volume average particle diameter thereof is in the range of (&#x2155;)&#xd7;DT to (&#x2154;)&#xd7;DT, wherein DT represents the volume average particle diameter of the entire toner, and a method for producing the same, as well as an electrostatic latent image developing developer, a toner cartridge, a process cartridge, and an image forming apparatus using the same.50&#x2266;()&#xd7;100&#x2266;90&#x2003;&#x2003;Formula (1)

Electrostatic latent image developing toner and method for producing the same, and electrostatic latent image developer, toner cartridge, process cartridge and image forming apparatus

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

The present invention provides a process cartridge that is freely attachable to and detachable from a main body of an image forming apparatus and that includes a latent image bearing body and a developing device having a developer storage space for storing a developer, the image forming apparatus and an image forming method. The invention also provides another image forming method using a one-component magnetic toner that is employable in a wide region of from a low process speed to a high process speed while achieving a high fixing ability.

Process cartridge, image forming apparatus and image forming method

A toner for developing an electrostatic latent image, wherein in regard to the molecular weight by GPC of the THF dissolved components of the toner, the ratio of at least 5&times;10 in the integral molecular weight distribution is not higher than 1% by weight, the ratio of not higher than 3&times;10 is not higher than 30% by weight, and the ratio &lcub;W(5&times;10 )/W(1&times;10 )&rcub; of the ratio &lcub;W(5&times;10 )&rcub; of not higher than 5&times;10 to the ratio &lcub;W(1&times;10 )&rcub; of at least 1&times;10 is from 15 to 50. Also, the molecular weight by GPC of the THF dissolved components of the toner is distributed in the range of not larger than 1&times;10 , the value of the differential molecular weight distribution of the molecular weight of 5&times;10 is not larger than 0.55%, and the value of the differential molecular weight distribution of the molecular weight of 1&times;10 is not larger than 0.15%.

Toner for developing electrostatic latent image, two-component developer, and image-forming process

A toner for developing an electrostatic latent image contains a binder resin, a colorant, a wax, and inorganic fine particles. The toner contains the inorganic fine particles content in the range from 1 to 10% by weight, the temperature at which the complex viscosity &eegr;&deg; of the toner in the case of measuring at a frequency of 100 rad/second shows 1000 Pa.s ranges from 125 to 145&deg; C., and the temperature at which the complex viscosity &eegr;&deg; of the toner in the case of measuring at a frequency of 100 rad/second shows 100 Pa.s ranges from 180 to 210&deg; C.

Toner for developing electrostatic latent image, two-component developer and image-forming process

A full color electrophotographic toner including toner particles containing at least a binder resin, a colorant and a wax, and external additives, at least one of the external additives being rutile titanium oxide having a volume resistivity of 1&times;10 to 1&times;10 &OHgr;cm, and a dispersion absolute deviation a of rutile titanium oxide being 0.17 or less, and a full color electrophotographic developer and an image forming method using the same are provided. In the full color electrophotographic toner, the full color electrophotographic developer and the image forming method of the invention, a retransfer phenomenon of the transferred toner can be prevented, a chargeability and a transferability are not problematic at all, a charging amount of the toner in long-term use can be rendered appropriate and stable, and a fluidity is also excellent.

Full color electrophotographic toner, full color electrophotographic developer and image forming method

Provided is a toner having good offset resistance and capable of giving non-glaring, high-quality images with high OHP transparency, and a method of image formation with it. The toner includes at least a binder resin, a colorant and a wax. The THF soluble component of the toner, as analyzed through gel permeation chromatography, has a number-average molecular weight falling between 2500 and 5500, a weight-average molecular weight falling between 13000 and 25000, and a peak molecular weight falling between 5000 and 15000, and contains a fraction having a molecular weight of at least 10,in a ratio of at most 10% by weight of the component and a fraction having a molecular weight of at least 10,in a ratio of from 30 to 70% by weight of the component, and the wax in the toner has a DSC endothermic peak falling between 50 and 120&deg; C.

Toner and method of image formation using the same

A full-color latent image developing toner composed of toner particles containing a binder resin, a coloring agent, and a surface lubricant, and at least one kind of an external additive, wherein the toner contains at least about 3% the surface lubricant, the toner includes irregular-shaped particles of ML,/A&gE;125, and when the emission voltage caused by the carbon originated in the binder resin of the toner particles is X and the emission voltage caused by the element originated in the external additive is Y, and when the relationship between X,and Y are primary-regressed to the straight line passing through origin of a coordinate, the correlation factor of the element originated in at least one external additive is not less than 0.4. As the external additive, a titanium compound obtained by reacting TiO(OH),prepared by a wet method and a silane compound is preferably used.

Electrostatic latent image developing toner and image-forming process

Provided is an image-forming process including a step of forming an electrostatic latent image on a latent image-carrier and a step of developing the latent image by a developer on a developer-carrier disposed facing the electrostatic latent image-carrier, a developer contains a color toner containing a wax which amount is from 1 to 10% by weight of the toner is used, and the developer-carrier wherein a ten-point average roughness (Rz) of the surface thereof of and the average spacing (Sm) of roughness peaks meet the following formula is used; 5.ltoreq.Rz.times.20.ltoreq.Sm. By the process, the conveying property of the developer is good, staining of the surface of the developer-carrier can be prevented, and images having a high quality and excellent in the fixing property over a long period time is obtained even in the case of using oil-less color toners containing a wax.

Image-forming process

An electrostatic latent image developer including a toner, which is formed from an outer additive and non-magnetic resin particles containing a binder resin and a coloring agent, and a carrier, in which a resin coating layer in which electroconductive fine powder is dispersed in a matrix resin is formed on a core, wherein a volume specific resistivity of said carrier is greater than or equal to 10.sup.9 .OMEGA..multidot.cm at an electric field strength of 3000 V/cm and is less than or equal to 10.sup.13 .OMEGA..multidot.cm at an electric field strength of 10000 V/cm, said outer additive contains titanium oxide whose volume specific resistivity of a compression-molded molded product is greater than or equal to 10.sup.6 .OMEGA..multidot.cm at an electric field strength of 3000 V/cm and is less than or equal to 10.sup.10 .OMEGA..multidot.cm at an electric field strength of 10000 V/cm, and a volume specific resistivity of said electrostatic latent image developer when a toner concentration is greater than or equal to 2% is greater than or equal to 10.sup.11 .OMEGA..multidot.cm at an electric field strength of 3000 V/cm. Further, the present invention provides an image forming method including steps of forming a latent image on a latent image holding member, and developing the latent image by using said electrostatic latent image developer.

Electrostatic latent image developer and image forming method

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

The present invention provides a long-life carrier for developing an electrostatic latent image to be used in such field of applications as electrostatic photography and electrostatic recording, a developer of an electrostatic latent image utilizing said carrier, a method for forming an image and an image forming apparatus by using said developer. By use of the foregoing qualities, a high-quality image can be obtained.

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Minami-ashigara, Japan

Yasuhiro Oya