Mitsubishi Kasei Corporation

Mitsubishi Chemical Corporation

Mikio Uno

Takashi Shintaku

Takatsugu Takehara

Yoshihiro Kigami

Kazuhiro Hirama

Takuya Nishikiori

Yoshio Kojima

Disclosed is a method for producing a toner for developing electrostatic images, which comprises the steps of kneading a mixture of raw materials comprising at least a resin and a colorant, cooling the kneaded mixture, pulverizing the cooled mixture, classifying the pulverized mixture, and feeding a fine powder separated by the classification step to a melt of the mixture of raw materials in the middle of the kneading step. The toner has improved fixability, durability and storage stability, with which stable and high-quality images are obtained even by continuous copying operation.

Method for producing toner for developing electrostatic images

Disclosed is a toner for flash fixation which comprises: (i) a resin containing (a) a low molecular weight compound having the peak of molecular weight in 3,000 to 60,000 by gel permeation chromatography (GPC) and (b) a high molecular weight compound having the peak or shoulder of molecular weight in 80,000 to 1,000,000 by GPC, with the weight ratio of the low molecular weight to the high molecular weight compound in the range of 97 to 60/3 to 40 and (ii) a coloring material or a toner for flash fixation which comprises (i) a resin containing (a) a low molecular weight compound having the peak of molecular weight (Lp) in 3,000 to 60,000 by GPC, (b) a middle molecular weight compound having the peak of molecular weight (Mp) in 5,000 to 100,000 by GPC and (c) a high molecular weight compound having the peak of molecular weight (Hp) in 80,000 to 1,000,000 by GPC, with the condition of Lp&lt;Mp&lt;Hp and (ii) a coloring material, and a method for fixing a toner by flash fixation using these.

Toner for flash fixation

A toner for heat fixing comprising a styrene type resin and a colorant and satisfying the following formula:

Toner for heat fixing

A novel toner for developing electrostatic images is disclosed, which comprises at least a resin and a granulated carbon black having a grain hardness of 2 g or less as starting raw materials blended therein. In addition, a novel process for the production of the novel toner is described.

Toner for developing electrostatic image and process for production

An electrostatic image-developing positively chargeable toner comprising at least toner particles containing a resin and a colorant, and conductive fine particles having their surface treated with a positively chargeable resin.

Electrostatic image-developing positively chargeable toner and developer

Disclosed herein is an electrostatic image-developing toner comprising particles of a toner precursor particles composed of at least a resin and a colorant, and powder of a compound represented by the following formula (I):

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Odawara, Japan

Mikio Uno