US 8,795,939 B2Granted

Toner, and developer and image forming apparatus using the toner

AssigneeRicoh Company, Ltd.

InventorsAtsushi Yamamoto, Shinya Nakayama, Masahide Yamada, Hideyuki Santo, Suzuka Amemori

Life of this patent

Estimating the term…

A toner, including a lactone compound having not less than 14-membered rings; and a resin including a crystalline polyester unit.

Dependent claims

A toner, comprising:

a lactone compound having not less than 14-membered rings;
and
a resin comprising a crystalline polyester unit formed from polycondensation between a diol and a dicarboxylic acid;
wherein the lactone compound is present in the toner as a separate component from the resin.

1 more element

Dependencies are inferred from the claim text.

G03G 9/08757
Comprising macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds: polycarbonates
G03G 9/08755
Comprising macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds: polyesters
G03G 9/08764
Comprising macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds: polyureas; Polyurethanes
G03G 9/08797
Macromolecular material not specially provided for in a single one of groups G03G9/08702 - G03G9/08775: characterised by their physical…

From the US filing history. Foreign family members aren’t listed.

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