Toner

• US 10,197,936 B2
• Filed: 11/09/2017
• Issued: 02/05/2019
• Est. Priority Date: 11/25/2016
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Onozaki, Yuto, Hashimoto, Takeshi, Kanno, Ichiro, Hama, Masayuki, Sano, Hitoshi, Komatsu, Nozomu, Kobori, Takakuni, Fujikawa, Hiroyuki, Ida, Hayato
• Primary Examiner(s): Chapman, Mark A
• Application Number:
  US15/807,766
• Publication Number:
  US 20180149992A1
• Time in Patent Office: 453 Days
• Field of Search: 4301102
• CPC Class Codes: G03G 9/081 by mixing the toner components in a liquefied state; melt kneading; reactive mixing
• CPC Class Codes: G03G 9/08704 Polyalkenes
• CPC Class Codes: G03G 9/08711 with esters of acrylic or methacrylic acid
• CPC Class Codes: G03G 9/08722 Polyvinylalcohols; Polyallylalcohols; Polyvinylethers; Polyvinylaldehydes; Polyvinylketones; Polyvinylketals
• CPC Class Codes: G03G 9/08724 Polyvinylesters
• CPC Class Codes: G03G 9/08728 Polymers of esters
• CPC Class Codes: G03G 9/08755 Polyesters
• CPC Class Codes: G03G 9/08782 Waxes
• 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 9/09321 obtained by reactions only involving carbon-to-carbon unsaturated bonds
• CPC Class Codes: G03G 9/1075 Structural characteristics of the carrier particles, e.g. shape or crystallographic structure

Abstract

Provided is a toner including toner particles each containing an amorphous polyester resin and a wax, in which: the surface of each of the toner particles has a coating layer; and the coating layer contains one or more kinds of olefin-based copolymers each having a specific ester moiety.

Claims

1. A toner, comprising toner particles each containing an amorphous polyester resin and a wax, wherein:

a surface of each of the toner particles has a coating layer;

the coating layer contains at least one kind of olefin-based copolymer selected from a group of resins each having at least a structural unit represented by the following formula (1) and a structural unit represented by the following formula (2) and/or the following formula (3); and

an arithmetic average of ratios of the units represented by the formulae (2) and (3) with respect to the olefin-based copolymer is 3 mass % or more and 35 mass % or less;

2. A toner according to claim 1, wherein when a total sum of a mass of the at least one kind of olefin-based copolymer is represented by W, and masses of the units represented by the formula (1), the formula (2), and the formula (3) are represented by 1, m, and n, respectively, a weighted average of a ratio (l+m+n)/W of the olefin-based copolymer to be incorporated into a binder resin is 0.80 or more.

3. A toner according to claim 1, wherein the olefin-based copolymer comprises one of

an ethylene-vinyl acetate copolymer having the units represented by the formula (1) and the formula (2) in which R₁ represents H, R₂ represents H, and R₃ represents CH₃,

an ethylene-methyl acrylate copolymer having the units represented by the formula (1) and the formula (3) in which R₁ represents H, R₄ represents H, and R₅ represents CH₃,

an ethylene-ethyl acrylate copolymer having the units represented by the formula (1) and the formula (3) in which R₁ represents H, R₄ represents H, and R₅ represents C₂H₅, and

an ethylene-methyl methacrylate copolymer having the units represented by the formula (1) and the formula (3) in which R₁ represents H, R₄ represents CH₃, and R₅ represents CH₃.

4. A toner according to claim 1, wherein a content of the at least one kind of olefin-based copolymer is 1 part by mass or more and 40 parts by mass or less with respect to 100 parts by mass of the toner particles.

5. A toner according to claim 1, wherein the olefin-based copolymer has a weight-average molecular weight of 50,000 or more.