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US 9,829,816 B2Granted
Toner
AssigneeCanon Kabushiki Kaisha
InventorsMasatake Tanaka, Yoshihiro Nakagawa, Naoya Isono, Tsutomu Shimano, Shintaro Noji, Yu Yoshida, Takeshi Kaburagi, Shohei Shibahara
Life of this patent
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Abstract
Provided is a toner for which the heat-resistant storability and the low-temperature fixability are able to co-exist at higher levels and for which the temporal stability of the low-temperature fixability is also excellent. The toner has a toner particle that contains a binder resin and a pigment, and this binder resin contains a polyester resin that has a specific structure and specific properties.
Claims7
A toner comprising a toner particle, said toner particle comprising:
- a pigment, the pigment being at least one member selected from the group consisting of an organic pigment and a carbon black;
- and
- a binder resin, the binder resin comprising styrene-acrylic resin, and a crystalline polyester resin, the crystalline polyester resin being obtained by condensation polymerization of a monomer (a) selected from monomer group A described below and a monomer (b) selected from monomer group B described below, wherein
- the crystalline polyester resin has a content X (mol %) of the unit derived from the monomer (b), as calculated by formula (1) of from 3.0 to 12.0 mol %:
- X={Mb/(Ma +Mb)}×100 (1)
- where Ma (mol/g) is the number of moles of the unit derived from the monomer (a) per unit mass, and Mb (mol/g) is the number of moles of the unit derived from the monomer (b) per unit mass, and
- a melting point of the crystalline polyester resin is from 50 to 85° C.,
- monomer group A comprises a C2-11 α,ω-straight-chain aliphatic diol, a C2-13 α,ω-straight-chain aliphatic dicarboxylic acid, a C2-12 α,ω-straight-chain aliphatic monohydroxymonocarboxylic acid, an intramolecular anhydride of a C2-13 α,ω-straight-chain aliphatic dicarboxylic acid, an alkylester of a C2-13 α,ω-straight-chain aliphatic dicarboxylic acid, an alkylester of a C2-12 α,ω-straight-chain aliphatic monohydroxymonocarboxylic acid, or a lactonized compound of a C2-12 α,ω-straight-chain aliphatic monohydroxymonocarboxylic acid, and
- monomer group B comprises a C12-22 α,ω-straight-chain aliphatic diol, a C14-24 α,ω-straight-chain aliphatic dicarboxylic acid, a C13-23 α,ω-straight-chain aliphatic monohydroxymonocarboxylic acid, an intramolecular anhydride of a C14-24 α,ω-straight-chain aliphatic dicarboxylic acid, an alkylester of a C14-24 α,ω-straight-chain aliphatic dicarboxylic acid, an alkylester of a C13-23 α,ω-straight-chain aliphatic monohydroxymonocarboxylic acid, or a lactonized compound of a C13-23 α,ω-straight-chain aliphatic monohydroxymonocarboxylic acid.
6 more elements
Dependencies are inferred from the claim text.