Kao Corporation

Takashi Okuno

Eiji Shirai

Takashi Kubo

Hiroshi Mizuhata

Shoichi Murata

Koji Shimokusa

Koji Kameyama

Takayuki Ikenaga

Shuichi Inaya

Nobuyuki Suzuki

Keishi Yokota

Kojiro Kameyama

The present invention relates to a process for producing a toner for electrophotography which includes the step of fusing aggregated particles containing resin particles (A) and releasing agent particles in an aqueous mixed solution containing the aggregated particles and an anionic surfactant having a polyalkylene glycol moiety with an average molar number of addition of an alkylene oxide having 2 to 3 carbon atoms of from 5 to 100 after and/or while adjusting a pH value of the aqueous mixed solution to 2.0 to 6.0 as measured at 25&#xb0; C., and a toner for electrophotography obtained by the process.

Process for producing toner for electrophotography

The present invention relates to a crystalline polyester for toner, obtained by polycondensation of an alcohol component comprising 70% by mol or more of 1,6-hexanediol, and a carboxylic acid component comprising 70% by mol or more of an aromatic carboxylic acid compound. The crystalline polyester for toner of the present invention is used as a resin binder for a toner used, for instance, for developing electrostatic latent images formed in electrophotography, electrostatic recording method, electrostatic printing method, and the like.

Crystalline polyester for toner

The present invention provides a method for souring, using an scouring agent composition which has low-viscosity although being highly concentrated, which has excellent scouring property under highly alkaline conditions, and which has excellent biodegradability. That is, the present invention provides a method for scouring fiber, which comprises the step of treating the fiber with a scouring agent comprising (A) a nonionic surfactant having the formula (I):

Scouring agent composition for fiber

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Wakayama, Japan

Takashi Okuno