Toner

• US 10,012,921 B2
• Filed: 08/21/2017
• Issued: 07/03/2018
• Est. Priority Date: 08/25/2016
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Kamae, Kentaro, Matsuo, Ryuichiro, Iwasaki, Yosuke, Katsumata, Wakiko, Mitsuiki, Kenta, Ohtsu, Takeshi, Miura, Masaharu, Ishigami, Koh, Mizo, Yuichi
• Primary Examiner(s): Vajda, Peter L
• Application Number:
  US15/681,742
• Publication Number:
  US 20180059565A1
• Time in Patent Office: 316 Days
• CPC Class Codes: G03G 9/0821 characterised by physical parameters magnetic parameters G03G9/083
• CPC Class Codes: G03G 9/0827 characterised by their shape, e.g. degree of sphericity
• CPC Class Codes: G03G 9/08711 with esters of acrylic or methacrylic acid
• CPC Class Codes: G03G 9/08755 Polyesters
• CPC Class Codes: G03G 9/08786 Graft polymers
• CPC Class Codes: G03G 9/08795 characterised by their chemical properties, e.g. acidity, molecular weight, sensitivity to reactants
• CPC Class Codes: G03G 9/08797 characterised by their physical properties, e.g. viscosity, solubility, melting temperature, softening temperature, glass transition temperature
• CPC Class Codes: G03G 9/0904 Carbon black
• CPC Class Codes: G03G 9/0918 Phthalocyanine dyes
• CPC Class Codes: G03G 9/09733 Organic compounds G03G9/08782 takes precedence

Abstract

A toner having a toner particle containing an amorphous resin, a crystalline resin, a colorant, a release agent, and a polymer in which a styrene-acrylic polymer is graft-polymerized on a polyolefin, wherein the amorphous resin contains an amorphous polyester resin A, and the amorphous polyester resin A has a monomer unit derived from polyhydric alcohol and a monomer unit derived from polyhydric carboxylic acid, has, a particular amount of a succinic acid-derived monomer unit in the monomer unit derived from polyhydric carboxylic acid, and has, a particular amount of a monomer unit derived from a propylene oxide adduct on bisphenol A in the monomer unit derived from polyhydric alcohol; and has a particular softening point, a particular solubility parameter, and a particular peak molecular weight.

Claims

1. A toner comprising:

a toner particle containing;

an amorphous resin,

a crystalline resin,

a colorant,

a release agent, and

a polymer in which a styrene-acrylic polymer is graft-polymerized on a polyolefin,

wherein

the amorphous resin contains an amorphous polyester resin A, and

the amorphous polyester resin A

(1) has a monomer unit derived from polyhydric alcohol and a monomer unit derived from polyhydric carboxylic acid,

has a content, in the monomer unit derived from polyhydric carboxylic acid, of at least 20.0 mol % and not more than 60.0 mol % of a succinic acid-derived monomer unit, and

has a content, in the monomer unit derived from polyhydric alcohol, of at least 90.0 mol % and not more than 100.0 mol % of a monomer unit derived from a propylene oxide adduct on bisphenol A,

(2) has a softening point of at least 85°

C. and not more than 95°

C.,

(3) has a solubility parameter [SP(A)], determined based on Fedors'"'"' equation, of at least 12.30 and not more than 12.40, and

(4) has a peak molecular weight [Mp(A)] of at least 4,000 and not more than 5,000.

2. The toner according to claim 1, wherein

the crystalline resin comprises a crystalline polyester resin C, and

the crystalline polyester resin C has a solubility parameter [SP(C)], determined based on Fedors'"'"' equation, of at least 11.00 and not more than 11.40.

3. The toner according to claim 1, wherein the styrene-acrylic polymer comprises a monomer unit derived from a cycloalkyl (meth)acrylate.