Canon Kabushiki Kaisha

Emi Watanabe

Naotaka Ikeda

Yuhei Terui

Katsuya Murakami

Yusuke Yamada

Kenji Aoki

Hiroyuki Fujikawa

Takayuki Toyoda

Kunihiko Nakamura

Masashi Kawamura

Nobuo Nakajima

Yasuhiro Hashimoto

Taiji Katsura

Masato Yamaoka

Hidekazu Fumita

Akira Suzuki

Makoto Hayashida

Nobuharu Hoshi

Shinya Yachi

Katsuyuki Nonaka

Koji Abe

Nobuhisa Abe

A developer supply kit detachably mountable to a developer supplying apparatus comprising a developer supply container and a developer accommodated therein, wherein the developer supply container includes, a developer accommodating portion accommodating the developer, a discharge opening for discharging the developer accommodated in the developer accommodating portion, a drive receiving portion to which a driving force is inputted from the developer supplying apparatus, and a pump portion operable so that an internal pressure of the developer accommodating portion alternately and repetitively changes between a pressure lower than a ambient pressure and a pressure higher than the ambient pressure, by the driving force received by the drive receiving portion, wherein the developer accommodated in the developer supply container includes toner containing binder resin material and a coloring material, the developer satisfies,10&#x2264;(mJ)&#x2264;80,0.4&#x2264;(mJ)&#x2264;2.0,

Developer supply kit, developer supplying device and image forming apparatus

A developer supply kit detachably mountable to a developer supplying apparatus comprising a developer supply container and a developer accommodated therein, wherein the developer supply container includes, a developer accommodating portion accommodating the developer, a discharge opening for discharging the developer accommodated in the developer accommodating portion, a drive receiving portion to which a driving force is inputted from the developer supplying apparatus, and a pump portion operable so that an internal pressure of the developer accommodating portion alternately and repetitively changes between a pressure lower than a ambient pressure and a pressure higher than the ambient pressure, by the driving force received by the drive receiving portion, wherein the developer accommodated in the developer supply container includes toner containing binder resin material and a coloring material, the developer satisfies,10&#x2266;(mJ)&#x2266;80,0.4&#x2266;(mJ)&#x2266;2.0,

A toner is provided that can maintain high transferability even in long-term image output, can maintain high chargeability even in a high temperature and high humidity environment, and rarely causes fogging due to charging failure. The toner contains toner particles produced by a suspension polymerization method or a dissolution suspension method. The volume-average particle diameter (Dv) of silica particles is 50 nm or more and 800 nm or less. The mass loss rate due to heating of the silica particles from 105&#xb0; C. to 200&#xb0; C. is 0.60% or less. The hydrophobicity of the silica particles is 5% or more and less than 40%.

Toner and method for producing toner

A toner containing toner particles, each of which contains a binder resin and a colorant, and silica particles, wherein the silica particles have a volume average particle diameter (Dv) of 70 nm or more and 500 nm or less, the variation coefficient of diameters of the silica particles, based on volume distribution thereof, is 23% or less, and wherein when the silica particles are heated from 105&#xb0; C. to 200&#xb0; C., the ratio of mass decrease is 0.60% or less.

Toner

A toner is provided that, even in a small amount thereof, gives a satisfactory image density and that is free of image problems, e.g., fogging and offset resistance, even during long-term use and in a high-temperature, high-humidity environment. The toner contains a binder resin, a pigment, and a prescribed azo compound wherein, designating as (A) the solubility of the azo compound in a toluene-hexane solubility test and as (B) the solubility of the binder resin constituting the toner in the toluene-hexane solubility test, the (A) and the (B) satisfy the relationship |(B)&#x2212;(A)|&#x2266;60.

Provided is a toner manufactured in an aqueous solvent, whereby a satisfactory image density can be obtained and the toner laid-on level on a recording medium can be reduced with a normal added concentration of pigment without adding a large quantity of pigment to the toner. The toner is manufactured in an aqueous medium by the suspension polymerization or dissolution suspension method and contains a binder resin, a pigment and an azo compound. The azo compound is a specific azo compound, and the absolute value of the difference in zeta potential between the binder resin and the azo compound is 25 mV or less.

A toner having toner base particles each of which contains at least a binder resin and a colorant, and silica titania composite particles. The silica titania composite particles contain silica in an amount of from 55.0% by mass to 85.0% by mass; and, in a chart obtained by the measurement by X-ray diffraction of the silica titania composite particles and where, in respect of a peak having the highest diffraction intensity and a peak having the next-highest diffraction intensity among peaks present in the range of 2&#x3b8;=24.0 to 29.0, the value of area of the peak on the lower-angle side is represented by Xa and the value of area of the peak on the higher-angle side is represented by Xb, the ratio of Xa/Xb is from 95/5 to 75/25.

Provided is a sealing member for preventing leakage of a developer from a developer containing portion of a process cartridge detachable from a main body of an electrophotographic image forming apparatus to an outside of the developer containing portion. The sealing member is made of a thermoplastic elastomer that contains at least a copolymer and a plasticizer. In a molecular weight distribution of a tetrahydrofuran soluble matter of the thermoplastic elastomer measured by gel permeation chromatography, at least one peak is present in each of a region of a molecular weight of 4,000 or less and a region of a molecular weight of 30,000 to 200,000, and a percentage of a component of a molecular weight of 800 or less in a region of a molecular weight of 5,000 or less is 30% or less.

Sealing member and process cartridge

A toner is provided which has toner particles and a fine silica powder mixed by external addition to the toner particles. The toner has a weight average particle diameter of 4.0 to 9.0 &#x3bc;m. The fine silica powder is subjected to hydrophobic treatment with dimethylsilicone oil, and has, in particle size distribution based on volume, a peak at which cumulative frequency is largest, in the measurement range of 0.02 &#x3bc;m to 1,000.00 &#x3bc;m; the cumulative frequency of 0.10 &#x3bc;m to less than 1.00 &#x3bc;m being 7.0% or less, and, the fine silica powder fulfills the following conditions:

Growing community of inventors

Suntou-gun, Japan

Emi Watanabe