Wax dispersant for toner and toner

• US 9,969,834 B2
• Filed: 08/23/2016
• Issued: 05/15/2018
• Est. Priority Date: 08/25/2015
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Ohtsu, Takeshi, Kamae, Kentaro, Matsuo, Ryuichiro, Iwasaki, Yosuke, Katsumata, Wakiko, Miura, Masaharu, Ishigami, Koh, Mizo, Yuichi, Mitsuiki, Kenta
• Primary Examiner(s): LE, HOA VAN
• Application Number:
  US15/244,439
• Publication Number:
  US 20170058067A1
• Time in Patent Office: 630 Days
• CPC Class Codes: C08F 255/02 on to polymers of olefins having two or three carbon atoms
• CPC Class Codes: G03G 9/0806 whereby chemical synthesis of at least one of the toner components takes place
• CPC Class Codes: G03G 9/081 by mixing the toner components in a liquefied state; melt kneading; reactive mixing
• CPC Class Codes: G03G 9/0821 characterised by physical parameters magnetic parameters G03G9/083
• CPC Class Codes: G03G 9/08755 Polyesters
• CPC Class Codes: G03G 9/08782 Waxes
• CPC Class Codes: G03G 9/08786 Graft polymers

Abstract

A wax dispersant for a toner including a polymer obtained by graft polymerization of a styrene-acrylic resin onto a hydrocarbon compound, wherein the styrene-acrylic resin has a structural segment derived from a saturated alicyclic compound, and a toner including a toner particle that contains a binder resin, a wax, and a polymer obtained by graft polymerization of a styrene-acrylic resin onto a hydrocarbon compound, wherein the styrene-acrylic resin has a structural segment derived from a saturated alicyclic compound.

Claims

1. A wax dispersant for a toner comprising:

a graft polymer having a polypropylene onto which a styrene-acrylic resin is grafted, wherein

the styrene-acrylic resin has a monomer unit represented by Formula (1)

2. The wax dispersant for a toner according to claim 1, wherein the styrene-acrylic resin further contains a monomer unit represented by Formula (2)

3. The wax dispersant for a toner according to claim 1, wherein in a molecular weight distribution determined by gel permeation chromatography of the wax dispersant for a toner, a weight-average molecular weight is 5000 to 70,000.

13. The wax dispersant for a toner according to claim 1, wherein the styrene-acrylic resin is a copolymer of a cyclohexyl methacrylate, a butyl acrylate, a styrene, and a methacrylic acid.

4. A toner comprising:

a toner particle that contains a binder resin, a wax, and a graft polymer having a polypropylene onto which a styrene-acrylic resin is grafted, wherein

the styrene-acrylic resin has a monomer unit represented by Formula (1)

5. The toner according to claim 4, wherein the styrene-acrylic resin further contains a monomer unit represented by Formula (2)

6. The toner according to claim 4, wherein in a molecular weight distribution determined by gel permeation chromatography of the graft polymer, a weight-average molecular weight is 5000 to 70,000.

7. The toner according to claim 4, wherein the binder resin comprises a crystalline polyester resin and an amorphous polyester resin.

8. The toner according to claim 7, wherein

the crystalline polyester resin is a polycondensate of an alcohol component comprising at least one compound selected from the group consisting of an aliphatic diol having a carbon number of 6 to 12 and a derivative thereof, and a carboxylic acid component comprising at least one compound selected from the group consisting of an aliphatic dicarboxylic acid having a carbon number of 6 to 12 and a derivative thereof, and

an amount of the crystalline polyester resin is 1.0 to 15.0 parts by mass per 100.0 parts by mass of the amorphous polyester resin.

9. The toner according to claim 7, wherein a solubility parameter SP1 of the crystalline polyester resin and a solubility parameter SP2 of the graft polymer satisfy 0≤

SP1−

SP2≤

1.3.

10. The toner according to claim 4, wherein an acid value of the graft polymer is 5 to 50 mg KOH/g.

11. The toner according to claim 7, wherein the amount of the crystalline polyester resin in the toner particle is 2.0 to 10.0 parts by mass per 100.0 parts by mass of the amorphous polyester resin.

14. The toner according to claim 4, wherein the styrene-acrylic resin is a copolymer of a cyclohexyl methacrylate, a butyl acrylate, a styrene, and a methacrylic acid.

12. A two-component developer comprising:

a toner and a magnetic carrier, the toner comprising a toner particle that contains a binder resin, a wax, and a graft polymer having a polypropylene onto which a styrene-acrylic resin is grafted, wherein

the styrene-acrylic resin has a monomer unit represented by Formula (1);

15. The two-component developer according to claim 12, wherein the styrene-acrylic resin is a copolymer of a cyclohexyl methacrylate, a butyl acrylate, a styrene, and a methacrylic acid.