Konica Minolta, Inc.

Konica Minolta Business Technologies, Inc.

Hidehito Haruki

Kouji Sugama

Noboru Ueda

Shiro Hirano

Junya Onishi

Tatsuya Fujisaki

Natsuki Ito

Yohei Ohno

Kenshi Miyajima

Keisuke Asano

Tatsuya Nagase

Satoshi Uchino

Kosuke Nakamura

Shinya Obara

Hiroyuki Yasukawa

Hiroyuki Kozuru

Yoshiyasu Matsumoto

Naoya Tonegawa

Junichi Furukawa

Provided is a color image forming process using colorant-containing toners of multiple colors containing colorants respectively having different resistances, wherein each of the colorant-containing toners contains an amorphous resin, a crystalline polyester resin, and a mold release agent, at least the crystalline polyester resin contained in the colorant-containing toner other than the colorant-containing toner containing a colorant having the lowest resistance contains a hybrid crystalline polyester resin formed by bonding a crystalline polyester polymerized segment and an amorphous polymerized segment, and the content of the amorphous polymerized segment in the hybrid crystalline polyester resin contained in the colorant-containing toner other than the colorant-containing toner containing a colorant having the lowest resistance is greater than the content of the amorphous polymerized segment in the crystalline polyester resin contained in the colorant-containing toner containing a colorant having the lowest resistance.

Color image forming process and color toner set

An image forming method includes using yellow toner, magenta toner, cyan toner, and black toner in which each of the yellow toner, the magenta toner, the cyan toner, and the black toner includes a crystalline polyester resin having a constitutional unit derived from a linear chain aliphatic diol, an amorphous resin, a colorant, and a releasing agent. A carbon number of a linear chain aliphatic diol component forming the crystalline polyester resin contained in the black toner is 6 or more, and a carbon number of a linear chain aliphatic diol component forming the crystalline polyester resin contained in each of the yellow toner, the magenta toner, and the cyan toner is 3 or more and 5 or less.

Image forming method and toner set for developing electrostatic latent image

An object of the present invention is to provide an electrostatic image developing toner containing toner mother particles, wherein the toner mother particle is formed by being provided with a plurality of convex portions on a toner mother particle precursor; the toner mother particle precursor contains a vinyl resin, a crystalline resin, and a mold release agent; the convex portion is formed with a hybrid amorphous polyester resin which is formed with a vinyl type polymerization segment and a polyester type polymerization segment both bonded together; and the hybrid amorphous polyester resin contains constituting units of a bisphenol A-propylene oxide adduct and a bisphenol A-ethylene oxide adduct.

Electrostatic image developing toner and production method of electrostatic image developing toner

A toner for developing electrostatic latent images contains a particulate toner which at least includes a colorant, a binder resin, a mold release agent, and a crystalline polyester resin. The binder resin contains a styrene-acrylic resin. The toner has a storage modulus G', a difference (X) between the maximum value and the minimum value of the storage modulus G&#x2032;, and a difference (Y) between the maximum value and the minimum value of a loss modulus G&#x2033; within the range of 140 to 180&#xb0; C. satisfying relationships expressed by Conditional expressions (1) 1.0&#xd7;10&#x2266;G&#x2032;&#x2266;1.0&#xd7;10, (2) 0&#x2266;X&#x2266;3.0&#xd7;10, and (3) 0&#x2266;Y&#x2266;6.0&#xd7;10.

Toner for developing electrostatic latent images

The toner according to the present invention comprises a matrix phase composed of a vinyl resin, and domain phases composed of a non-crystalline polyester resin dispersed in the matrix phase, and a number-average domain diameter of the domain phases composed of the non-crystalline polyester resin is 30 to 150 nm. The toner satisfies relation represented by a specific requirement of the total area of the domain phases present in a surface layer area of the toner particle, and the total area of the domain phases present in areas other than the surface layer area, in a given cross-section of the toner particle.

Toner for developing electrostatic latent image and process for producing the same

A two-component developing agent for developing an electrostatic latent image includes toner particles composed of toner base particles and an exterior additive attached on the toner base particles, and carrier particles composed of carrier core particles and a coating resin provided on the carrier core particles. The coating resin includes a sulfur atom and a resin obtained by polymerizing an isobutyl methacrylate monomer, and the toner base particles include a sulfur atom.

Two-component developing agent for developing electrostatic latent image and method for forming electrophotographic image

Provided is an electrostatic charge image developing toner capable of reproducing color exhibiting high lightness and chroma, and obtaining a wide color reproduction range. Disclosed is the toner possessing a toner particle containing at least a binder resin and a colorant, wherein the colorant possesses a yellowish color nonfluorescent dye exhibiting a peak wavelength of an absorption spectrum being in a wavelength range of 400-480 nm, and a fluorescent dye exhibiting a peak wavelength of an emission spectrum being in a wavelength range of 480-560 nm, wherein the nonfluorescent dye has a content of 2-8 parts by weight, based on 100 parts by weight of the binder resin, and the fluorescent dye has a content of 0.05-0.2 parts by weight, based on 100 parts by weight of the resin, provided that a content ratio of the nonfluorescent dye to the fluorescent dye is 15-150.

Electrostatic charge image developing toner

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Asaka, Japan

Hidehito Haruki