Sanyo Chemical Industries, Ltd.

Eiji Iwawaki

Tomohisa Kato

Yuko Sugimoto

Hiroshi Odajima

Satoshi Utsui

Mana Sanpei

Masaru Honda

Kenta Nose

Takahiro Tanaka

Hideo Harada

The toner binder of the present invention contains a crystalline resin (A) and a resin (B) that is a polyester resin or its modified resin, the polyester resin being obtained by reaction of an alcohol component (X) and a carboxylic acid component (Y) as raw materials, wherein a temperature (Tp) of the top of an endothermic peak derived from the crystalline resin (A) as measured by a differential scanning calorimeter (DSC) is in the range of 40&#xb0; C. to 100&#xb0; C., and endothermic peak areas Sand Sduring heating satisfy the following equation.()&#xd7;100&#x2265;35&#x2003;&#x2003;(1)Sis an area of the endothermic peak derived from the crystalline resin (A) in the first heating process, and Sis an area of the endothermic peak derived from the crystalline resin (A) in the second heating process, when the toner binder is heated, cooled, and heated.

Toner binder, and toner

The toner binder of the present invention contains a crystalline resin (A) and a resin (B) that is a polyester resin or its modified resin, the polyester resin being obtained by reaction of an alcohol component (X) and a carboxylic acid component (Y) as raw materials, wherein a temperature (Tp) of the top of an endothermic peak derived from the crystalline resin (A) as measured by a differential scanning calorimeter (DSC) is in the range of 40&#xb0; C. to 100&#xb0; C., and endothermic peak areas Sand Sduring heating satisfy the following equation.()&#xd7;100&#x2267;35&#x2003;&#x2003;(1)Sis an area of the endothermic peak derived from the crystalline resin (A) in the first heating process, and Sis an area of the endothermic peak derived from the crystalline resin (A) in the second heating process, when the toner binder is heated, cooled, and heated.

Disclosed is a resin particle having excellent low-temperature fusibility, having a sufficiently narrow size distribution, and that is obtained using a liquid or supercritical fluid. In the resin particle (C), which comprises a microparticle (A) containing a resin (a) being coated to or adhered to the surface of a resin particle (B) that contains another resin (b), the degree of swelling of the microparticle (A) resulting from liquid or supercritical carbon dioxide (X) at a temperature less than the glass transition temperature or the melting point of the microparticle (A) is no greater than 16%, and with the resin (a) as a constituent unit, the resin particle (C) contains 0.1-50 wt % of a non-crystalline non-halogen vinyl monomer (m1) of which the solubility parameter (SP value: (cal/cm)) is 7-9.

Resin particle comprising microparticle having specific degree of swelling and containing vinyl-monomer-based resin of specific solubility parameter, and method for producing same

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Kyoto, Japan

Eiji Iwawaki