| US 7,537,875 B2 | ||
| Toner | ||
| Yushi Mikuriya, Numazu (Japan); Satoshi Handa, Shizuoka-ken (Japan); Yuji Moriki, Numazu (Japan); Yasushi Katsuta, Shizuoka-ken (Japan); and Emi Tosaka, Shizuoka-ken (Japan) | ||
| Assigned to Canon Kabushiki Kaisha, Tokyo (Japan) | ||
| Filed on Jun. 22, 2005, as Appl. No. 11/157,874. | ||
| Claims priority of application No. 2004-275553 (JP), filed on Sep. 22, 2004. | ||
| Prior Publication US 2006/0063082 A1, Mar. 23, 2006 | ||
| Int. Cl. G03G 9/00 (2006.01) | ||
| U.S. Cl. 430—108.3 [430/108.4; 430/109.4; 430/111.4; 430/137.14] | 8 Claims |
| 1. A toner comprising toner particles which comprise toner base particles containing at least a colorant, a release agent
and a polar resin;
said polar resin is a resin having at least a polyester unit, synthesized in the presence of an aromatic carboxylic acid titanium
compound used as a catalyst, wherein said aromatic carboxylic acid titanium compound is a compound obtained by the reaction
of an aromatic carboxylic acid with a titanium alkoxide, wherein said aromatic carboxylic acid is selected from the group
consisting of an isophthalic acid and a terephthalic acid;
said polar resin has an acid value of from 3 mgKOH/g to 35 mgKOH/g;
said toner base particles have been granulated in an aqueous system by suspension polymerization, emulsion polymerization
or suspension granulation;
said toner has a weight average particle diameter of from 4.0 μm to 10.0 μm; and
said release agent is contained in an amount of from 6 to 18 parts by weight based on 100 parts by weight of the toner base
particles.
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