Binder resin composition for toner
AssigneeKao Corporation
InventorsMotomu Shibata, Shoichi Murata
Life of this patent
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Abstract
Provided are a binder resin composition for toner excellent in low-temperature fusing property, storage stability and durability, a toner for developing electrostatic images that contains the binder resin composition for toner, and a method for producing the binder resin composition for toner. The binder resin composition for toner contains a resin composition (C-P) prepared by condensing an acid group-having crystalline resin (C) and a polyalkyleneimine, and an amorphous resin (A).
Claims21
A toner for developing electrostatic images comprising a binder resin composition, wherein the binder resin composition comprises:
- a resin composition (C-P) prepared by condensing an acid group-having crystalline resin (C) and a polyalkyleneimine;
- and
- an amorphous resin (A),
- wherein the acid group-having crystalline resin (C) is a crystalline polyester-based resin being a polycondensate of an alcohol component (c-al) and a carboxylic acid component (c-ac), in which the alcohol component (c-al) comprises an α,ω-aliphatic diol having 2 to 16 carbon atoms, and the carboxylic acid component (c-ac) comprises an α,ω-aliphatic dicarboxylic acid having 4 to 14 carbon atoms.
A method for producing a toner for developing electrostatic images comprising a binder resin composition, the method comprising adding the binder resin composition to raw materials of the toner, wherein the binder resin composition is prepared by the method comprising:
- condensing an acid group-having crystalline resin (C) and a polyalkyleneimine to obtain a resin composition (C-P);
- and
- mixing the resin composition (C-P) and an amorphous resin (A),
- wherein the acid group-having crystalline resin (C) is a crystalline polyester-based resin being a polycondensate of an alcohol component (c-al) and a carboxylic acid component (c-ac), in which the alcohol component (c-al) comprises an α,ω-aliphatic diol having 2 to 16 carbon atoms, and the carboxylic acid component (c-ac) comprises an α,ω-aliphatic dicarboxylic acid having 4 to 14 carbon atoms.
Dependencies are inferred from the claim text.