Toner and two-component developer

• US 9,417,540 B2
• Filed: 12/12/2014
• Issued: 08/16/2016
• Est. Priority Date: 12/26/2013
• Status: Active Grant

• Current Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Original Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Inventors: Hashimoto, Takeshi, Kaneko, Hideki, Komatsu, Nozomu, Kobori, Takakuni, Iwasaki, Yosuke, Kanno, Ichiro, Takenaka, Kohji, Fujikawa, Hiroyuki
• Primary Examiner(s): Rodee, Christopher
• Application Number:
  US14/568,727
• Publication Number:
  US 20150185650A1
• Time in Patent Office: 613 Days
• Field of Search: 430/109.4
• US Class Current: 1/1
• 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 9/08797 characterised by their physical properties, e.g. viscosity, solubility, melting temperature, softening temperature, glass transition temperature

Abstract

Provided is a toner obtained by melting and kneading a binder resin containing a polyester resin A and a polyester resin B, a colorant, and a wax, in which in the resin A, the content of a polyhydric alcohol unit derived from an aromatic diol, the content of a polyhydric alcohol unit derived from an oxyalkylene ether of a novolac type phenol resin, and the content of a polyvalent carboxylic acid unit derived from an aliphatic dicarboxylic acid, which contains a straight-chain hydrocarbon having 4 or more to 16 or less carbon atoms as a main chain and has carboxyl groups at both of its terminals, fall within specific ranges, and in the resin B, the content of a polyhydric alcohol unit derived from an aromatic diol and the content of a polyvalent carboxylic acid unit derived from an aromatic dicarboxylic acid or a derivative thereof fall within specific ranges.

Claims

1. A toner comprising:

a binder resin;

a colorant; and

a wax,

the toner being obtained through a step of melting and kneading the binder resin, the colorant, and the wax,

wherein;

the binder resin comprises;

a polyester resin A having a polyhydric alcohol unit and a polyvalent carboxylic acid unit, and

a polyester resin B having a polyhydric alcohol unit and a polyvalent carboxylic acid unit;

a mass ratio (polyester resin A/polyester resin B) of the polyester resin A to the polyester resin B is from 10/90 or more to 60/40 or less;

the polyester resin A has a softening point of from 120°

C. or more to 180°

C. or less;

the polyester resin A contains 90 mol % or more of a polyhydric alcohol unit derived from an aromatic diol with respect to a total number of moles of the polyhydric alcohol unit, and contains 0.1 mol % or more to 10.0 mol % or less of a polyhydric alcohol unit derived from an oxyalkylene ether of a novolac type phenol resin with respect thereto;

the polyester resin A contains 15 mol % or more to 50 mol % or less of a polyvalent carboxylic acid unit derived from an aliphatic dicarboxylic acid, which contains a straight-chain hydrocarbon having 4 or more to 16 or less carbon atoms as a main chain and has carboxyl groups at both terminals of the main chain, with respect to a total number of moles of the polyvalent carboxylic acid unit;

the polyester resin B has a softening point of from 80°

C. or more to 100°

C. or less;

the polyester resin B contains 90 mol % or more of a polyhydric alcohol unit derived from an aromatic diol with respect to a total number of moles of the polyhydric alcohol unit;

the polyester resin B contains 90 mol % or more of a polyvalent carboxylic acid unit derived from one of an aromatic dicarboxylic acid and a derivative thereof with respect to a total number of moles of the polyvalent carboxylic acid unit; and

the polyester resin B contains 0.1 mol % or more to 10.0 mol % or less of a polyvalent carboxylic acid unit derived from one of an aliphatic dicarboxylic acid and a derivative thereof with respect to the total number of moles of the polyvalent carboxylic acid unit.

2. The toner according to claim 1, wherein a glass transition temperature Tg(80) of the polyester resin A measured with a differential scanning calorimeter (DSC) by increasing a temperature of the resin to 80°

C. once, then reducing the temperature to 30°

C., and then increasing the temperature again, and a glass transition temperature Tg(180) of the resin measured with the differential scanning calorimeter (DSC) by increasing the temperature to 180°

C. once, then reducing the temperature to 30°

C., and then increasing the temperature again have a relationship represented by the following mathematical expression (1)

−

1.0≦

Tg(80)−

Tg(180)≦

1.0 

 

(1).

3. The toner according to claim 1, wherein the wax comprises a hydrocarbon wax.

4. The toner according to claim 1, wherein the binder resin further comprises a polymer C having a structure in which a vinyl-based resin component and a hydrocarbon compound are bonded to each other.

5. A two-component developer, comprising:

the toner according to claim 1; and

a magnetic carrier.

6. The two-component developer according to claim 5, wherein a concentration of the toner in the two-component developer is from 2 mass % or more to 15 mass % or less.