Toner
AssigneeCanon Kabushiki Kaisha
InventorsMichihisa Magome, Tadashi Dojo, Eriko Yanase, Takashi Matsui, Tomohisa Sano, Akira Sakakibara, Shuichi Hiroko
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Abstract
In a toner containing at least a binder resin, a colorant, an ester compound and a low-melting material, the ester compound is an ester of dipentaerythritol with a carboxylic acid having 18 or more to 25 or less carbon atoms, and, where the melting point of the ester compound is represented by Tm(A) (° C.) and the melting point of the low-melting material is represented by Tm(B) (° C.), the toner satisfies the relationship of: Tm(B)≦Tm(A)+5.
Claims8
A toner which comprises toner particles containing at least a binder resin, a colorant, an ester compound and a low melting material;
- the ester compound being an ester of dipentaerythritol with a carboxylic acid having 18 or more to 25 or less carbon atoms;
- where the melting point of the ester compound is represented by Tm(A)(° C.) and the melting point of the low melting material is represented by Tm(B)(° C.), the toner satisfying the relationship of:
- Tm(B)<Tm(A);
- wherein the ester compound has a solubility S(A) in a styrene acrylic resin, of 2.5% or less, the styrene-acrylic resin has a glass transition temperature of 54.0° C.±1.0° C., a number-average molecular weight of 20,000±2,000 and a weight average molecular weight of 200,000±20,000;
- and
- wherein the low melting material has a solubility S(B) in the styrene acrylic resin, of from 5.5% or more to 20.0% or less, and S(A)<S(B).
Dependencies are inferred from the claim text.