Canon Kabushiki Kaisha

Shohei Yamashita

Yuhei Terui

Koji Nishikawa

Tsutomu Shimano

Kohei Matsuda

Yuki Nishizawa

Yusuke Hasegawa

Tomohisa Sano

Yoshitaka Suzumura

Takuma Ikejiri

Shota Amano

Takeshi Tsujino

Koki Inoue

Junya Asaoka

Yuu Sasano

Satoshi Arimura

The powder adhesive comprises a thermoplastic resin and particles of an aromatic compound, wherein the particles of an aromatic compound are particles of a compound that has an aromatic ring and an azo bond bonded to the aromatic ring, or are particles of a compound comprising a heteroaromatic ring comprising nitrogen atom; the thermoplastic resin comprises an ester group; and, designating Es (mmol/g) as an ester group concentration in the thermoplastic resin, M (mass %) as a content of the aromatic compound particles in the powder adhesive, and N (mmol/g) as a nitrogen atom concentration in the aromatic compound particles, Es is from 1.0 mmol/g to 4.5 mmol/g, M is from 1.0×10mass % to 1.0×10mass %, and N is from 5.0 mmol/g to 15.0 mmol/g.

Powder adhesive and bonded article

An electrophotographic developer set comprising a toner, and a powder adhesive, wherein the powder adhesive comprises a crystalline polyester resin, and a thermoplastic resin other than the crystalline polyester resin; the amount of the crystalline polyester resin in the powder adhesive is 21% by mass or more; the melting point of the crystalline polyester resin is 55° C. to 100° C.; in a viscoelasticity measurement, where Gt'(100) denotes a storage elastic modulus of the toner at 100° C. and Gb′(100) denotes a storage elastic modulus of the powder adhesive at 100° C., Gb′(100) is 1.0×10Pa or less and Gt′(100)/Gb′(100) is 1.2 or more.

Electrophotographic developer set comprising toner and powder adhesive, and method for producing bonded product

A production method of a toner having a toner particle that contains a binder resin and an external additive that is externally added to the toner particle, wherein the production method has a toner particle dispersion step of obtaining a toner particle dispersion by dispersing the toner particle and an inorganic dispersant in an aqueous medium; and an external addition step of externally adding the external additive to the toner particle through addition of the external additive to the toner particle dispersion.

Method for producing a toner

An electrophotographic developer set comprising a toner comprising a thermoplastic resin and a wax, and a powder adhesive comprising a thermoplastic resin and a wax, wherein where Ea (mmol/g) denotes an ester group concentration of the wax contained in the toner, Na (mass %) denotes a content of the wax in the toner, Eb (mmol/g) denotes an ester group concentration of the wax contained in the powder adhesive, and Nb (mass %) denotes a content of the wax in the powder adhesive, the Ea, the Na, the Eb and the Nb satisfy the following formulae: 0.00≤Ea≤2.45, 2.50≤Eb≤3.60, and 0.80≤Nb/Na.

Electrophotographic developer set comprising toner and powder adhesive, method for producing bonded product, and powder adhesive

A toner having a toner particle including a toner base particle and an organosilicon polymer coating the toner base particle, wherein when S1 (&#x3bc;m) is a total area of a non-coated part not coated with the organosilicon polymer on an outermost surface of the toner particle, S2 (&#x3bc;m) is a total area of a coated part coated with the organosilicon polymer on the outermost surface of the toner particle, and SA1 (&#x3bc;m) is a total of areas of non-coated part domains D1 with an area of not more than 0.10 &#x3bc;min size in the non-coated part not coated with the organosilicon polymer, formulae (1) and (2) below are satisfied.0.45&#x2264;[2/(1+2)]&#x2264;0.65&#x2003;&#x2003;(1)(1/1)&#x2265;0.50&#x2003;&#x2003;(2)

Toner

Provided is an electrophotographic developer set having a toner and a powder adhesive, wherein the toner comprises a thermoplastic resin A; the powder adhesive comprises a thermoplastic resin B and a wax A; the wax A has two or more ester groups in the molecule; the thermoplastic resin B has an ester group; and in a viscoelasticity measurement, with Gt'(100) (Pa) being a storage elastic modulus at 100&#xb0; C. of the toner, and Gb&#x2032;(100) (Pa) being a storage elastic modulus at 100&#xb0; C. of the powder adhesive, Gb&#x2032;(100) is 1.00&#xd7;10Pa or less, and Gt&#x2032;(100)/Gb&#x2032;(100) is 1.20 or more, as well as a method for producing a bonded product using the above electrophotographic developer set.

Electrophotographic developer set including toner and powder adhesive, and method for producing bonded product

A toner comprising toner particles, each of which contains a binder resin and a colorant, wherein an onset temperature Te (&#xb0; C.) of a storage elastic modulus E' obtained in a powder dynamic viscoelastic measurement on the toner is at least 50&#xb0; C. and not more than 70&#xb0; C., and a value at Te (&#xb0; C.) of a storage elastic modulus G&#x2032; obtained in a pellet dynamic viscoelastic measurement on the toner is at least 4.0&#xd7;10Pa and not more than 1.0&#xd7;10Pa.

A toner comprises toner particles, each of which contains a binder resin, a colorant, a wax and a crystalline polyester. The melting point P(t) of the crystalline polyester is at least 65.0&#xb0; C. and not more than 80.0&#xb0; C., and regarding a storage elastic modulus G' obtained in dynamic viscoelasticity measurement of the toner, where G&#x2032; at 50&#xb0; C. is denoted by G&#x2032;(50), G&#x2032; at 80&#xb0; C. is denoted by G&#x2032;(80), G&#x2032; at 120&#xb0; C. is denoted by G&#x2032;(120), and G&#x2032; at the melting point P(t) of the crystalline polyester is denoted by G&#x2032;(t), the following formulas are satisfied: 4.2&#xd7;10Pa&#x2264;G&#x2032;(50), 3.0&#xd7;10&#x2264;G&#x2032;(50)/G&#x2032;(80), and G&#x2032;(t)/G&#x2032;(120)&#x2264;7.0&#xd7;10.

Provided is a method for producing a toner particle including a step of condensing a raw slurry by using a decanter-type centrifugal separator, in an aqueous medium. The step of condensing the raw slurry is carried out under following conditions: a centrifugal force is at least 500 G and less than 4000 G and a temperature is at least Tg&#x2212;10&#xb0; C. and not more than Tg+10&#xb0; C. And a ratio of a colored particles in condensed slurry is within a prescribed range.

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Mishima, Japan

Shohei Yamashita