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US 7,029,813 B2Granted
Toner
AssigneeCanon Kabushiki Kaisha
InventorsYushi Mikuriya, Yasushi Katsuta, Keiji Komoto, Takeshi Kaburagi, Emi Tosaka
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Abstract
In a toner having toner particles containing at least a colorant, a release agent and a polar resin, and an inorganic fine powder, the polar resin contains a polyester resin obtained by carrying out polymerization in the presence of a titanium chelate compound as a catalyst, and has an acid value in a specific range. The toner particles are granulated in an aqueous medium and have a weight-average particle diameter in a specific range.
Claims9
A toner comprising:
- toner particles containing at least a colorant, a release agent, a polar resin, and an inorganic fine powder,
- wherein said polar resin contains (a) at least 3% by weight of said polar resin of a polyester resin unit obtained by carrying out polymerization in the presence of from 0.01% by weight to 2% by weight titanium chelate compound as a catalyst, and (b) has an acid value of from 3 mg×KOH/g to 35 mg×KOH/g;
- said toner particles are obtained by carrying out granulation in an aqueous medium;
- said toner has a weight average particle diameter of from 4 μm to 10 μm;
- and
- wherein in said titanium chelate compound, its chelating compound is a diol, a dicarboxylic acid or an oxycarboxylic acid.
3 more elements
Dependencies are inferred from the claim text.