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US 2012/0237869 A1Published application
Toner and method of manufacturing toner
AssigneeRicoh Company, Ltd.
InventorsSusumu CHIBA, Hiroshi YAMASHITA, Masaki WATANABE, Satoyuki SEKIGUCHI, Daisuke ASAHINA
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Abstract
A toner including a colorant and a binder resin is provided. The binder resin includes a polyester resin having a glass transition temperature of 18 to 40° C., a weight average molecular weight of 10,000 to 100,000, and a flow beginning temperature of 70 to 120° C. The toner has a volume average particle diameter of 3 to 10 μm.
Claims10
A toner, comprising:
- a colorant;
- and
- a binder resin, the binder resin including a polyester resin having a glass transition temperature of 18 to 40° C., a weight average molecular weight of 10,000 to 100,000, and a flow beginning temperature of 70 to 120° C.,
- wherein the toner has a volume average particle diameter of 3 to 10 μm.
1 more element
A method of manufacturing toner, comprising:
- preparing a polyester resin, including:
- reacting a polycarboxylic acid with a polyol, at least one of which having three or more valences, to form an intermediate polyester resin having a three-dimensional network molecular structure;
- and
- reacting at least one of a dicarboxylic acid and a diol with the intermediate polyester, to form linear molecular chains at terminals of the three-dimensional network molecular structure;
- dissolving or dispersing toner components in an organic solvent to prepare a toner components liquid, the toner components including a colorant and the polyester resin;
- emulsifying the toner components liquid in an aqueous medium to prepare an emulsion;
- and
- removing the organic solvent from the emulsion.
5 more elements
Dependencies are inferred from the claim text.