Toner

Patent metadata

Field	Value
Publication number	US-9785068-B2
Application number	US-201615245360-A
Country	US
Kind code	B2
Filing date	Aug 24, 2016
Priority date	Aug 28, 2015
Publication date	Oct 10, 2017
Grant date	Oct 10, 2017

Abstract

The toner has a toner particle that contains a binder resin and a wax, wherein the wax is present in domain form in the interior of the toner particle; the proportion of toner particles for which the position of the wax domains are controlled, is in a prescribed range; using d for a major axis length of the domain having the largest major axis length and using D for a number-average particle diameter of the toner, the d and D satisfy a prescribed relationship; and the ratio between the major axis length and the minor axis length of the domain having the largest major axis length is in a prescribed range.

First claim

What is claimed is:

1. A toner comprising a toner particle containing a binder resin and a wax, wherein
in a three-dimensional analysis of the internal structure of the toner particle,
(i) the wax is present in domain form in the interior of the toner particle;
(ii) the proportion of toner particles for which a shortest distance between a surface of the toner particle and a domain having a largest major axis length among the domains of the wax is less than 50 nm, is equal to or less than 10.0 number %;
(iii) the proportion of toner particles for which the shortest distance between the surface of the toner particle and the domain having the largest major axis length is at least 50 nm and not more than 500 nm, is equal to or greater than 60.0 number %;
(iv) using d for a major axis length of the domain having the largest major axis length and using D for a number-average particle diameter (D 1 ) of the toner, the d and D satisfy the relationship with the following formula (1)
0.25 D<d< 0.50 D   (1); and

(v) the ratio between the major axis length and a minor axis length (major axis length/minor axis length) of the domain having the largest major axis length is at least 1.0 and not more than 2.5.

2. The toner according to claim 1 , wherein the wax contains a wax A and a wax B,
the wax A being a hydrocarbon wax, and the wax B being an ester wax.

3. The toner according to claim 2 , wherein the wax B is an ester of a hexahydric alcohol and an aliphatic acid or is an ester of a hexabasic carboxylic acid and an aliphatic alcohol.

4. The toner according to claim 2 , wherein, using SPa for an SP value of the wax A and SPb for an SP value of the wax B, the following relationship is satisfied
SPb−SPa> 0.3.

5. The toner according to claim 1 , wherein the toner particle contains a resin A,
the resin A containing a polymer that has a segment with the following formula (2) in a terminal position in a side chain

in the formula (2), each R 1 independently represents an alkyl group having at least 1 and not more than 18 carbons or an alkoxyl group having at least 1 and not more than 18 carbons; n represents an integer that is at least 0 and not more than 3; and * is a bonding segment in the polymer.

6. The toner according to claim 1 , wherein the toner particle contains a resin A,
the resin A containing a polymer that has a segment with the following formula (2-1) in a terminal position in a side chain;

in the formula (2-1), each R 1 independently represents an alkyl group having at least 1 and not more than 18 carbons or an alkoxy group having at least 1 and not more than 18 carbons; R 2 represents a hydrogen atom, a hydroxy group, an alkyl group having at least 1 and not more than 18 carbons or an alkoxy group having at least 1 and not more than 18 carbons; g represents an integer that is at least 1 and not more than 3; h represents an integer that is at least 0 and not more than 3; and * is a bonding segment in the polymer.

Assignees

• Canon Kk

Inventors

• Umeda Noriyoshi
• Kaburagi Takeshi
• Ikeda Naotaka
• Kyuushima Hirofumi
• Shibahara Shohei
• Wada Yoshiaki

Classifications

• G03G9/0825 Primary

  characterised by their structure; characterised by non-homogenuous distribution of components (microcapsular toners G03G9/093) · CPC title

• G03G9/08711

  with esters of acrylic or methacrylic acid · CPC title

• G03G9/08782

  Waxes · CPC title

• G03G9/0806

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

• G03G9/0819

  characterised by the dimensions of the particles · CPC title