US 2010/0062355 A1Published application

Cyan toner

AssigneeCanon Kabushiki Kaisha

InventorsTakaaki Kaya, Ayako Sekikawa, Ryoichi Fujita, Shigeto Tamura, Makoto Kambayashi

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Abstract

Provided is a cyan toner which, while being a capsule-type toner having excellent low-temperature fixability, has excellent offset resistance and charging performance and can obtain high-quality images. A cyan toner having at least a resin (a) having a polyester as a main component, a colorant, and a wax, in which glass transition temperatures (° C.) Tg(0.5) and Tg(4.0) obtained at a rate of temperature increase of 0.5° C./min or 4.0° C./min satisfy 40.0≦Tg(0.5)≦60.0 and 2.0≦Tg(4.0)−Tg(0.5)≦10.0, and wherein, when the concentration of the cyan toner in an ethyl acetate dispersion is Cc1 (mg/ml), and the light absorbance at a wavelength of 712 nm of the dispersion is A(ethyl acetate)712, A(ethyl acetate)712/Cc1<0.15 is satisfied, and wherein, when the concentration of the cyan toner in a chloroform solution is Cc2 (mg/ml), and the light absorbance at a wavelength of 712 nm of the solution is A(chloroform)712, 2.00<A(chloroform)712/Cc2<8.15 is satisfied.

Claims9

Dependent claims

A cyan toner having at least a resin (a) having a polyester as a main component, a colorant, and a wax, characterized by satisfying the following formulas (1) and (2) in DSC measurement,

40.0≦Tg(0.5)≦60.0 (1)
2.0≦Tg(4.0)−Tg(0.5)≦10.0 (2)
(wherein Tg(0.5) is a glass transition temperature (° C.) obtained at a rate of temperature increase of 0.5° C./min, and Tg(4.0) is a glass transition temperature (° C.) obtained at a rate of temperature increase of 4.0° C./min)
wherein, when the concentration of the cyan toner in an ethyl acetate dispersion is Cc2 (mg/ml), and the light absorbance at a wavelength of 712 nm of the dispersion is A(ethyl acetate)712, a relationship between Cc1 and A(ethyl acetate)712 satisfies the following formula (3),
A(ethyl acetate)712/Cc2<0.15 (3)
and wherein, when the concentration of the cyan toner in a chloroform solution is Cc2 (mg/ml), and the light absorbance at a wavelength of 712 nm of the solution is A(chloroform)712, a relationship between Cc2 and A(chloroform)712 satisfies the following formula (4).
2.00<A(chloroform)712/Cc2<8.15 (4)

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/616,872Filed 12 Nov 2009
Priority: JP 2008-19752631 Jul 2008
Published: 11 Mar 2010
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

G03G 9/08755
Comprising macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds: polyesters
G03G 9/0804
Preparation methods: whereby the components are brought together in a liquid dispersing medium
G03G 9/0806
Whereby the components are brought together in a liquid dispersing medium: whereby chemical synthesis of at least one of the toner components…
G03G 9/0821
With toner particles: characterised by physical parameters