Toner

Patent metadata

Field	Value
Publication number	US-9658551-B2
Application number	US-201414509250-A
Country	US
Kind code	B2
Filing date	Oct 8, 2014
Priority date	Oct 9, 2013
Publication date	May 23, 2017
Grant date	May 23, 2017

Abstract

The present invention provides a toner having a toner particle that contains a binder resin, wherein the binder resin contains a vinylic resin and a polyester resin, the vinylic resin contains an organic silicon polymer having a specific structure, the organic silicon polymer is contained in the surface layer of the toner particle, the proportion of a silicon atom in the organic silicon polymer having a specific structure is at least 5%, the polyester resin is a specific polymer, and the toner particle contains a specific amount of the polyester resin.

First claim

What is claimed is:

1. A toner comprising:
a toner particle that contains a binder resin,
wherein
the binder resin contains a vinylic resin and a polyester resin,
the vinylic resin contains an organic silicon polymer having a partial structure represented by the following formula (1) or the following formula (2):

(wherein, A and B respectively and independently represent a partial structure represented by the following formula (3) or the following formula (4), and in formula (2), L represents a methylene group, ethylene group or phenylene group),

(wherein, R 1 represents a hydrogen atom or alkyl group having from 1 to 22 carbon atoms and R 2 represents a hydrogen atom or methyl group),
a surface layer of the toner particle contains the organic silicon polymer,
a proportion of a silicon atom in the organic silicon polymer having a structure represented by the —SiO 3/2 relative to a silicon atom in the organic silicon polymer contained in the toner particle is at least 5%,
the polyester resin contains at least one polymer selected from the group consisting of polymers indicated in the following (i), (ii) and (iii):
(i) a polymer obtained by condensation polymerization of an alcohol component containing at least 50.0 mol % of an aliphatic diol having from 2 to 16 carbon atoms, and a carboxylic acid component containing at least 50.0 mol % of an aliphatic dicarboxylic acid having from 2 to 16 carbon atoms,
(ii) a polymer obtained by condensation polymerization of an alcohol component containing at least 50.0 mol % of an aliphatic diol having from 2 to 16 carbon atoms, and a carboxylic acid component containing at least 50.0 mol % of an aromatic dicarboxylic acid having from 8 to 18 carbon atoms, and
(iii) a polymer obtained by condensation polymerization of an alcohol component containing at least 50 mol % of an aromatic diol and a carboxylic acid component containing at least 50.0 mol % of an aliphatic dicarboxylic acid having from 2 to 16 carbon atoms, and
the toner particle contains from at least 3.0% by mass to not more than 70.0% by mass of the polyester resin based on the binder resin contained in the toner particle.

2. The toner according to claim 1 , wherein the polyester resin is a polyester resin having a melting point.

3. The toner according to claim 2 , wherein the melting point of the polyester resin is from at least 40.0° C. to not more than 90.0° C.

4. The toner according to claim 1 , wherein the polyester resin is a styrene-denatured polyester resin that has been denatured with styrene.

5. The toner according to claim 1 , wherein a ratio of the density of a silicon atom dSi to the total density of the density of a carbon atom dC, the density of a hydrogen atom dH, the density of a silicon atom dSi and the density of a sulfur atom dS in a surface of the toner particle is at least 0.5 atom %.

6. The toner according to claim 1 , wherein an average thickness Dav. of a surface layer of the toner particle that has the organic silicon polymer is from at least 5.0 nm to not more than 150.0 nm.

7. The toner according to claim 1 , wherein a proportion of a portion where a thickness of a surface layer of the toner particle that has the organic silicon polymer is not more than 5.0 nm is not more than 20.0%.

8. The toner according to claim 1 , wherein the organic silicon polymer is a polymer obtained by polymerizing an organic silicon compound having a structure represented by the following formula (5) or a structure represented by the following formula (6):

(wherein, R 3 , R 4 and R 5 respectively and independently represent a halogen atom, hydroxyl group or alkoxy group, and in formula (6), L represents a methylene group, ethylene group or phenylene group).

9. The toner according to claim 8 , wherein the alkoxy group is a methoxy group or an ethoxy group.

10. The toner according to claim 1 , wherein the toner particle is produced by:
forming, in an aqueous medium, a particle of a polymerizable monomer composition: containing an organic silicon compound for forming the organic silicon polymer, a polymerizable monomer for forming the binder resin, and the polyester resin; and
polymerizing the organic silicon compound and the polymerizable monomer.

Assignees

• Canon Kk

Inventors

• Terui Yuhei
• Nonaka Katsuyuki
• Abe Koji
• Takada Harumi

Classifications

• G03G9/0825

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

• G03G9/08708

  Copolymers of styrene · CPC title

• G03G9/08791 Primary

  characterised by the presence of specified groups or side chains · CPC title

• G03G9/09321

  obtained by reactions only involving carbon-to-carbon unsaturated bonds · CPC title

• G03G9/08755

  Polyesters · CPC title