Method for producing ground toner

Patent metadata

Field	Value
Publication number	US-9535350-B2
Application number	US-201615239114-A
Country	US
Kind code	B2
Filing date	Aug 17, 2016
Priority date	Mar 15, 2012
Publication date	Jan 3, 2017
Grant date	Jan 3, 2017

Abstract

Toner of one aspect of the present invention has a weight average molecular weight Mw of 30,000≦Mw≦95,263 as determined from a molecular weight distribution based on GPC, includes a THF-insoluble gel component at a weight proportion of less than 5%, and includes components each having a molecular weight of 500 to 1500 which components have an area occupancy of 4% to 10% on a chart of the molecular weight distribution based on GPC.

First claim

The invention claimed is:

1. A method for producing ground toner, the toner including:
a binder resin;
a coloring agent;
a release agent; and
a charge control agent,
the method comprising the steps of:
(a) selecting and mixing (i) the binder resin, (ii) an additive resin having a weight average molecular weight smaller than a weight average molecular weight of the binder resin, (iii) the coloring agent, (iv) the release agent, and (v) the charge control agent so that the toner has a weight average molecular weight Mw of 30,000≦Mw≦95,263 as determined from a molecular weight distribution based on gel permeation chromatography (GPC), that the toner includes a tetrahydrofuran-insoluble gel component at a weight proportion of less than 5%, and that the toner includes components each having a molecular weight of 500 to 1500 which components have an area occupancy of 4% to 10% on a chart of the molecular weight distribution based on GPC;
(b) fusing and kneading a mixture resulting from the step (a); and
(c) grinding a fused and kneaded product resulting from the step (b).

2. The method according to claim 1 ,
wherein:
the binder resin is a polyester resin; and
the additive resin is a styrene resin.

3. A method for producing a two component developer,
the method comprising:
the steps (a), (b), and (c) as recited in claim 1 ,
the method further comprising the step of
adding a magnetic carrier to the ground toner and mixing the magnetic carrier with the ground toner.

Assignees

• Sharp Kk

Inventors

• Kikawa Keiichi
• Sawai Tadayuki
• Tsubaki Yoritaka
• Mitamura Keigo
• Kawano Yui
• Fukuoka shintaro

Classifications

• G03G9/08755

  Polyesters · CPC title

• G03G9/107

  having magnetic components · CPC title

• G03G9/0821 Primary

  characterised by physical parameters (magnetic parameters G03G9/083) · CPC title

• G03G9/081

  by mixing the toner components in a liquefied state; melt kneading; reactive mixing · CPC title

• G03G9/08708

  Copolymers of styrene · CPC title