US 9,116,448 B2Granted

Toner

AssigneeCanon Kabushiki Kaisha

InventorsKazuo Terauchi, Shuhei Moribe, Kosuke Fukudome, Satoshi Mita, Yojiro Hotta, Tetsuya Ida

Life of this patent

Estimating the term…

Loading patent…

Abstract

Provided is a toner exhibiting satisfactory fixability even in high-speed fixing process involving a double-sided printing mechanism, keeping stable toner image even after a conveyance step, and doesn't cause curling to a fixing roller even in thin paper. In a toner including toner particles, each of which contains polyester resins A and B, a coloring agent, and a resin composition C, the resin A includes a crystal nucleating agent bonded to a polyester molecular chain including a moiety capable of forming a crystalline structure. The resin B doesn't include a moiety capable of forming a crystalline structure. The composition C is obtained by copolymerizing a vinyl-based resin component with a polyolefin resin component. SP values the resin A, the resin B, the agent, the polyolefin component, and the vinyl-based component satisfy the particular relationships.

Claims5

Dependent claims

A toner, comprising toner particles, each of which contains a polyester resin A, a polyester resin B, a coloring agent, and a resin composition C, wherein:

(1) the polyester resin A comprises a polyester part including a moiety capable of forming a crystalline structure and a crystal nucleating agent part, the crystal nucleating agent part being bonded to an end of the polyester part;
(2) the polyester resin B comprises a resin free of a moiety capable of forming a crystalline structure;
and
(3) the resin composition C comprises a resin composition including a vinyl-based resin component and a polyolefin resin component bonded to each other, and
wherein Sa, Sb, Sc, Sd, and Se satisfy the following relationships:
9.0<Sa<12.5
0<|Sc−Sd|<1.8
2.6<Se−Sd<4.6
−2.0<Sb−Sa<0.8
where the Sa ((cal/cm3)1/2) represents an SP value of the polyester part in the polyester resin A,
the Sb ((cal/cm3)1/2) represents an SP value of the polyester resin B,
the Sc ((cal/cm3)1/2) represents an SP value of the crystal nucleating agent part in the polyester resin A,
the Sd ((cal/cm3)1/2) represents an SP value of the polyolefin resin component, and
the Se ((cal/cm3)1/2) represents an SP value of the vinyl-based resin component.

11 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/922,205Filed 19 Jun 2013
Priority: JP 2012-14103522 Jun 2012
Published: US 2013/0344430 A126 Dec 2013
Granted: 25 Aug 2015
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

G03G 9/08755
Comprising macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds: polyesters
G03G 9/08704
Comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds: polyalkenes
G03G 9/08711
Copolymers of styrene: with esters of acrylic or methacrylic acid
G03G 9/08728
Polymers of unsaturated acids or derivatives thereof: polymers of esters