Konica Corporation

Konica Minolta Business Technologies, Inc.

Konishiroku Photo Industry Co., Ltd.

Konica-minolta Holdings, Inc.

Kao Corporation

Masafumi Uchida

Hiroshi Yamazaki

Meizo Shirose

Hiroyuki Takagiwa

Kenji Yamane

Yasuko Yamauchi

Kenji Hayashi

Jiro Takahashi

Kishio Tamura

Tsuyoshi Uchida

Satoru Ikeuchi

Hiroyuki Yamada

Ken Ohmura

Takao Yamanouchi

Ryuji Kitani

Mikio Kohyama

Toshiko Yajima

Tsuneo Daidoji

Masahiro Anno

Mikio Koyama

Kuniyasu Kawabe

Kouji Sugama

Chikara Tsutsui

Akitoshi Matsubara

Takeshi Arai

Yoshiki Nishimori

Hajime Tadokoro

Akira Ohira

Shingo Tanaka

Michiaki Ishikawa

Takahira Kasuya

Hideyo Nishikawa

Yuji Marukawa

Kunio Akimoto

Shoichiro Ishibashi

Hiroya Masaki

Mayumi Hayashi

Mayumi Tanaka

An embodiment may be an electrophotographic toner which comprises at least one toner particle which comprises an inner layer and an outer layer covering the inner layer, wherein a cross-sectional area ratio of the outer layer to the inner layer is 0.05-0.46, and wherein a non-uniform thickness exists in the outer layer, and further the average thickness (t) taken at 5 positions as calculated by, is about 0.2&#x2014;about 1.0 &#x3bc;m, t=(t+t+t+t+t)/5 (unit of t-tis &#x3bc;m) wherein trepresents a thickness of the thickest part of the outer layer, and t-teach represent a thickness of a second to a fifth thickest part of the outer layer in one particle, and wherein a glass transition point Tg of the inner layer is about 2&#x2014;about 45&#xb0; C. lower than Tg of the outer layer.

Toner for electrophotography

An embodiment may be an image forming method, which comprises forming a latent image on an image carrier; developing the latent image with a toner to form a toner image on the image carrier; transferring the toner image; and applying ultrasonic vibration at one of the developing step and the transferring step. The toner comprises a resin particle and a release agent particle having a melting point in a range of 40 to 75&#xb0; C. and the toner has Dp50 of 3.0 to 5.0 &#x3bc;m.

Image forming method

An image forming method, comprising: a step of forming a toner image on a image carrying member; and a step of transferring the toner image from the image carrying member to a transfer member, wherein toner forming the toner image has a volume-basis median diameter of 3.0 to 5.0 &#x3bc;m, contains a releasing agent with a melting point in the range of from 40&#xb0; C. to 75&#xb0; C., and is added with a lubricant.

A toner for developing electrostatic images which contains an external additive A containing an irregular-shaped metal oxide and having an average value of the feret's horizontal diameter of from 20 nm to 1370 nm, and an external additive B containing a hydrophobic particle having an average value of the feret's horizontal diameter of from 10 nm to 45 nm.

Toner for developing electrostatic latent images and a production method for the same

A toner for developing an electrostatic charge image comprising a resin, a colorant, and a particle having domain-matrix structure and the particle having two or more kinds of metal elements.

Toner for developing a latent image and an image forming method employing the same

An image forming method comprising: developing an electrostatic latent image on a latent image carrier with toner to form a toner image, transferring the toner image; and using ultrasonic vibration in the developing step or in the transferring step is disclosed. The toner includes toner particles that contain a releasing agent having a melting point 40-75&#xb0; C., and has a number-based median diameter D50 of 3.0 to 5.0 &#x3bc;m and a CV value of 12 to 20% in a number-based particle size distribution and/or a mean circularity of 0.975-1.000.

An apparatus for producing toner for developing an electrostatic latent image, is provided with an inlet section to receive a slurry containing toner particles, impure fine particles having a specific gravity smaller than that of the toner particles and aqueous medium; a centrifugal concentrating device for applying centrifugal force to the slurry and having a precipitating plate with which the toner particles are precipitated from the slurry and an accommodating section to accommodate a concentrated slurry containing the precipitated toner particles, and

Production apparatus of toner for developing electrostatic images, production method thereof, and toner for developing electrostatic images

An image forming method comprising the step of transferring a toner image while applying vibration by ultrasonic wave where in the toner particle forming the toner image has a sea-island structure containing at least two islands of a releasing agent, and the average of the nearest distance between the islands is from approximately 100 nm to approximately 1060 nm and the number of the island having the nearest wall distance of not less than 1300 nm is not more than 10% of the whole number of the islands contained in the toner particle.

Image forming method employing the toner

A toner used for an image forming method comprises steps of: limiting an amount of toner on a surface of a toner carrier by allowing a toner layer limiting member to be pressed to the surface of the toner carrier; and developing an electrostatic latent image formed on an electrostatic latent image carrier using the toner carried and transferred by the toner carrier, based on a non-magnetic single component development system, wherein the toner comprises toner particles having a volume average particle diameter of 3 to 9 &#x3bc;m, an arithmetic mean value of shape factor of 1.1 to 1.5, a coefficient of variation of shape factor of 16% or less, a ratio of rounded toner particle of 50% by number or more and a coefficient of variation of number particle diameter distribution of 26% or less, and a conveyance index of 2.0 to 10.0.

Toner and image forming method

An electrostatic photographic image forming toner is disclosed. The toner comprises a toner particle containing a binder resin and a colorant in which the binder resin has a specific softening point of from 105 to 132&#xb0; C. and the toner particle has a hardness of from 6.0 to 24.0 mN and a circularity of from 0.92 to 0.99.

Toner particle having a hardnes of 6.0 to 24.0 mN and a circularity of 0.92 to 0.99

An electrostatic image developing toner is disclosed. The resin of the toner particle has a cell structure and an average value of FERE-horizontal diameters of the cells is from 20 to 200 nm and a variation coefficient of the FERE-horizontal diameters of the cells is from 10 to 35%.

Electrostatic image developing

Toner for developing electrostatic latent image

A toner for developing electrostatic latent image is disclosed. The toner comprises a crystalline compound, and exhibits at least one recrystallization peak during the second heating process in the DSC curve of said toner. An image forming method employing the toner is also disclosed.

Electrostatically charged image developing toner, production method of the same, and an image forming method

A toner for developing an electrostatic image comprising a resin, a colorant and a releasing agent in which the toner particles are obtained by salting out/fusion-adhering a resin particle comprising a binding resin and a releasing agent together with a colorant particle is disclosed. The toner comprises the toner particles having a variation coefficient of not more than 16% and a number variation coefficient of the number particle size distribution of not more than 27%.

Toner for developing electrostatic image and image forming method

Growing community of inventors

Toyokawa, Japan

Masafumi Uchida