Method for producing toner particle

Patent metadata

Field	Value
Publication number	US-9927728-B2
Application number	US-201715467274-A
Country	US
Kind code	B2
Filing date	Mar 23, 2017
Priority date	Mar 24, 2016
Publication date	Mar 27, 2018
Grant date	Mar 27, 2018

Abstract

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−10° C. and not more than Tg+10° C. And a ratio of a colored particles in condensed slurry is within a prescribed range.

First claim

What is claimed is:

1. A method for producing a toner particle comprising a treatment step of treating a raw slurry containing an aqueous medium and colored particles each containing a binder resin and a colorant, wherein
the treatment step includes a step of condensing the raw slurry by using a decanter-type centrifugal separator so as to obtain a condensed slurry,
the decanter-type centrifugal separator includes
an external rotary cylinder and
a screw conveyor provided within the external rotary cylinder so as to be able to rotate relatively with the external rotary cylinder, and

the step of condensing the raw slurry is carried out under conditions below:
i) a centrifugal force is at least 500 G and less than 4000 G; and
ii) a temperature (Ts) is at least Tg−10° C. and not more than Tg+10° C. when the glass transition temperature of the colored particles is defined as Tg (° C.), and
wherein
when a ratio of the colored particles in the condensed slurry is defined as ratio B, the ratio B is at least 10% by mass and not more than 60% by mass.

2. The method for producing a toner particle according to claim 1 , wherein
when a ratio of the colored particle in the raw slurry is defined as ratio A, the ratio A is at least 5% by mass and not more than 40% by mass.

3. The method for producing a toner particle according to claim 1 , wherein the colored particles contain ester wax or crystalline polyester.

4. The method for producing a toner particle according to claim 1 , wherein the colorant contains magnetic powder.

Assignees

• Canon Kk

Inventors

• Arimura Satoshi
• Hasegawa Yusuke
• Sano Tomohisa
• Suzumura Yoshitaka
• Ikejiri Takuma
• Yamashita Shohei

Classifications

• G03G9/0806

  whereby chemical synthesis of at least one of the toner components takes place · CPC title

• B04B1/20

  discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl · CPC title

• G03G9/0926

  characterised by physical or chemical properties · CPC title

• G03G9/08711

  with esters of acrylic or methacrylic acid · CPC title

• G03G9/09

  Colouring agents for toner particles · CPC title