Toner and method for producing toner

• US 10,203,619 B2
• Filed: 08/28/2017
• Issued: 02/12/2019
• Est. Priority Date: 09/06/2016
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Yamashita, Daisuke, Hirasa, Takashi, Ida, Hayato, Tamura, Junichi, Shibata, Takaho, Murayama, Ryuji, Ochi, Kouichirou, Chimoto, Yuya, Miyakai, Tomoyo
• Primary Examiner(s): Chea, Thorl
• Application Number:
  US15/687,726
• Publication Number:
  US 20180067410A1
• Time in Patent Office: 533 Days
• CPC Class Codes: G03G 9/0804 whereby the components are brought together in a liquid dispersing medium
• CPC Class Codes: G03G 9/0821 characterised by physical parameters magnetic parameters G03G9/083
• CPC Class Codes: G03G 9/08722 Polyvinylalcohols; Polyallylalcohols; Polyvinylethers; Polyvinylaldehydes; Polyvinylketones; Polyvinylketals
• CPC Class Codes: G03G 9/08724 Polyvinylesters
• CPC Class Codes: G03G 9/08773 Polymers having silicon in the main chain, with or without sulfur, oxygen, nitrogen or carbon only
• 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

Abstract

A toner including: a binder resin containing an ethylene-vinyl acetate copolymer; a polysiloxane derivative A represented by structural formula 1; and a polysiloxane derivative B represented by structural formula 2:

(in structural formula 1, R₁ to R₁₀ each independently represent a methyl group or a phenyl group, and l, m and n each independently represent an integer of at least 1)

(in structural formula 2, at least one of R₁₁ to R₂₀ is an organic group having a C_4-30 alkyl group, a C_4-30 alkoxy group, an acrylic group, an amino group, a methacrylic group or a carboxyl group, the remaining groups among R₁₁ to R₂₀ each independently represent a methyl group or a phenyl group, and p, q and r each independently represent an integer of at least 1).

Claims

1. A toner comprising:

a binder resin containing an ethylene-vinyl acetate copolymer;

a polysiloxane derivative A represented by formula 1

2. The toner according to claim 1, wherein a content of the polysiloxane derivative B is 5 to 50 parts by mass relative to 100 parts by mass of the polysiloxane derivative A.

3. The toner according to claim 1, wherein a kinematic viscosity at 25°

C. of the polysiloxane derivative A is 5 to 1000 mm²/s.

4. The toner according to claim 1, wherein a melting point of the polysiloxane derivative B is 20 to 70°

C.

5. The toner according to claim 1, wherein 0.0≤

[Tm₀-Tm₁]≤

3.0 and 5.0≤

[Tm₀-Tm₂]≤

12.0 when a softening point of the binder resin is denoted by Tm₀ (°

C.), a softening point of a mixture obtained by heating and kneading the binder resin and the polysiloxane derivative A at a mass ratio of 100;

10 is denoted by Tm₁ (°

C.), and a softening point of a mixture obtained by heating and kneading the binder resin and the polysiloxane derivative B at a mass ratio of 100;

10 is denoted by Tm₂ (°

C).

6. A method for producing a toner, the method comprising:

a step of emulsifying a polysiloxane derivative A represented by formula 1 and a polysiloxane derivative B represented by formula 2 so as to obtain emulsified particles of the polysiloxane derivative A and the polysiloxane derivative B

7. The method for producing a toner according to claim 6, wherein the step of obtaining emulsified particles includes a step of mixing the polysiloxane derivative A represented by formula 1 and the polysiloxane derivative B represented by formula 2 prior to the emulsification.

8. The method for producing a toner according to claim 6, wherein a content of the polysiloxane derivative B is 5 to 50 parts by mass relative to 100 parts by mass of the polysiloxane derivative A.

9. The method for producing a toner according to claim 6, wherein a kinematic viscosity at 25°

C. of the polysiloxane derivative A is 5 to 1000 mm²/s.

10. The method for producing a toner according to claim 6, wherein a melting point of the polysiloxane derivative B is 20 to 70°

C.

11. The method for producing a toner according to claim 6, wherein 0.0≤

[Tm₀-Tm₁]≤

3.0 and 5.0≤

[Tm₀-Tm₂]≤

12.0 when a softening point of the binder resin is denoted by Tm₀(°

C.), a softening point of a mixture obtained by heating and kneading the binder resin and the polysiloxane derivative A at a mass ratio of 100;

10 is denoted by Tm₁ (°

C.), and a softening point of a mixture obtained by heating and kneading the binder resin and the polysiloxane derivative B at a mass ratio of 100;

10 is denoted by Tm₂ (°

C).