Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
Toner for image formation, method for producing toner, container containing toner, two-component developer, process cartridge, and image forming method
Provided is a toner for image formation, granulated by dispersing, emulsifying, or both dispersing and emulsifying an oil phase containing toner constituting materials in an aqueous medium. The toner constituting materials contain a binder resin, a colorant and a pigment dispersant which is a polyester derivative having an acid value of 28 to 50 mgKOH/g and an amine value of 1 to 50 mgKOH/g, and satisfy the following Expressions 1 and 2, where Expression 1 represents a mass ratio, α is a glass transition temperature of the binder resin, and β is a glass transition temperature of a mixture of the binder resin and the pigment dispersant in the ratio of Expression 1.Binder resin:Pigment dispersant=100:5  Expression 10° C.≦α−β≦10° C.  Expression 2
Ricoh Company, Ltd.
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Naohiro Tsuyoshi Hiroshi Shinichi
Watanabe Sugimoto Yamashita Wakamatsu