Toner

• US 10,401,748 B2
• Filed: 05/22/2017
• Issued: 09/03/2019
• Est. Priority Date: 05/26/2016
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Hashimoto, Takeshi, Komatsu, Nozomu, Onozaki, Yuto, Matsubara, Akifumi, Kanno, Ichiro, Sano, Hitoshi, Fujisaki, Tsubasa, Hama, Masayuki, Kobori, Takakuni, Fujikawa, Hiroyuki
• Primary Examiner(s): Vajda, Peter L
• Application Number:
  US15/600,929
• Publication Number:
  US 20170343911A1
• Time in Patent Office: 834 Days
• CPC Class Codes: C08G 63/12 derived from polycarboxylic acids and polyhydroxy compounds
• CPC Class Codes: C08G 63/85 Germanium, tin, lead, arsenic, antimony, bismuth, titanium, zirconium, hafnium, vanadium, niobium, tantalum, or compounds thereof C08G63/823 takes precedence
• CPC Class Codes: G01N 15/0826 and measuring fluid flow rate, i.e. permeation rate or pressure change
• CPC Class Codes: G03G 9/081 by mixing the toner components in a liquefied state; melt kneading; reactive mixing
• CPC Class Codes: G03G 9/08755 Polyesters
• CPC Class Codes: G03G 9/08793 Crosslinked 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 9/09708 Inorganic compounds
• CPC Class Codes: G03G 9/09783 Organo-metallic compounds

Abstract

A toner comprises a toner particle containing an amorphous polyester, wherein the amorphous polyester contains an amorphous polyester 1, the amorphous polyester contains a tin compound and a titanium compound, a Sn/Ti abundance ratio between Sn and Ti in the amorphous polyester according to x-ray fluorescence analysis is 20/80 to 80/20, and a weight-average molecular weight Mw1 of the amorphous polyester 1 according to measurement by gel permeation chromatography (GPC) is Mw1<7,000.

Claims

1. A method of producing a toner comprising a toner particle containing an amorphous polyester, the toner production method comprising:

a step of melt-kneading the amorphous polyester; and

a step of pulverizing the obtained kneaded material, wherein

the amorphous polyester contains an amorphous polyester 1,

the amorphous polyester further contains an amorphous polyester 2,

the amorphous polyester 1 contains either one of a tin compound and a titanium compound,

the amorphous polyester 2 contains the other of the tin compound and the titanium compound,

in the step of melt-kneading the amorphous polyester, both the amorphous polyester 1 and the amorphous polyester 2 are melt-kneaded,

a Sn/Ti abundance ratio between Sn and Ti in the amorphous polyester according to x-ray fluorescence analysis is 20/80 to 80/20,

a weight-average molecular weight Mw1 of the amorphous polyester 1 according to measurement by gel permeation chromatography (GPC) is Mw1<

7,000,

the tin compound does not contain a Sn—

C bond, and

the titanium compound has an alkanolamine-derived residue.

2. The method according to claim 1, wherein the titanium compound is titanium dihydroxybis(triethanolaminate).

3. The method according to claim 1, wherein the tin compound is tin alkylcarboxylate.

4. The method according to claim 1, wherein the titanium compound is titanium dihydroxybis(triethanolaminate), and

the tin compound is tin alkylcarboxylate.