Method for producing toner particles

Patent metadata

Field	Value
Publication number	US-9341967-B2
Application number	US-201414582949-A
Country	US
Kind code	B2
Filing date	Dec 24, 2014
Priority date	Dec 27, 2013
Publication date	May 17, 2016
Grant date	May 17, 2016

Abstract

A method for producing toner particles by a suspension polymerization method or a dissolution suspension method comprising: applying an inorganic dispersion stabilizer-containing liquid (liquid A) to a part that can come into contact with a polymerizable monomer composition or toner particle composition, the part being on an inner wall of a vessel used in a polymerization step or a vessel used in a solvent removal step; after the application of the liquid A, carrying out the polymerization step or solvent removal step; discharging the contents of the vessel after the completion of this polymerization step or solvent removal step; and after the contents of the vessel have been discharged, bringing an acidic aqueous solution (liquid B) to dissolve the inorganic dispersion stabilizer into contact with the inner wall of the vessel.

First claim

What is claimed is:

1. A method for producing toner particles comprising the steps of:
(1) providing an aqueous dispersion in which particles are dispersed in an aqueous medium, the particles containing
(i) a polymerizable monomer and a colorant, or
(ii) a mixed solution in which
a toner particle composition comprising a binder resin and a colorant, and an organic solvent, are contained, the toner particle composition being dissolved or dispersed in the organic solvent,

(2) introducing the aqueous dispersion into a vessel, and
(3) obtaining the toner particles by
(i) polymerizing the polymerizable monomer in the particles, or
(ii) removing the organic solvent from the mixed solution in the particles,

(4) removing a content in the vessel after the step (3), wherein,
the method further comprises
a step of applying an inorganic dispersion stabilizer containing liquid (liquid A) and attaching the inorganic dispersion stabilizer to a part of an inner wall of the vessel, prior to introducing the aqueous dispersion into the vessel in the step (2), the part of the inner wall of the vessel including a portion where the aqueous dispersion which is to be introduced in the step (2) is come into contact with, and
a step of removing the inorganic dispersion stabilizer attached to the part of the inner wall of the vessel by using an acidic aqueous solution (liquid B) after the step (4).

2. The method for producing toner particles according to claim 1 , wherein the inner wall of the vessel has been subjected to a glass lining treatment.

3. The method for producing toner particles according to claim 1 , wherein the inorganic dispersion stabilizer in the liquid A is a sparingly water-soluble metal phosphate.

4. The method for producing toner particles according to claim 3 , wherein pH of the liquid B is not more than 3.0.

5. The method for producing toner particles according to claim 1 , wherein the inorganic dispersion stabilizer in the liquid A is a sparingly water-soluble metal hydroxide.

6. The method for producing toner particles according to claim 5 , wherein pH of the liquid B is not more than 5.5.

7. The method for producing toner particles according to claim 1 , wherein the vessel is provided with a circulation line that discharges the liquid A or the liquid B from a bottom part of the vessel and re-introduces the same into the interior of the vessel from a top part of the vessel.

8. The method for producing toner particles according to claim 1 , wherein the liquid A is prepared in the interior of the vessel.

Assignees

• Canon Kk

Inventors

• Tsujino Takeshi
• Yamawaki Kentaro
• Asaoka Junya
• Fukushima Motoya

Classifications

• G03G9/0806 Primary

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