Toner production method and polymer

• US 10,216,108 B2
• Filed: 08/10/2017
• Issued: 02/26/2019
• Est. Priority Date: 08/16/2016
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Iwasaki, Yosuke, Ohtsu, Takeshi, Kamae, Kentaro, Matsuo, Ryuichiro, Katsumata, Wakiko, Mitsuiki, Kenta, Miura, Masaharu, Ishigami, Koh, Mizo, Yuichi
• Primary Examiner(s): Chea, Thorl
• Application Number:
  US15/673,672
• Publication Number:
  US 20180052402A1
• Time in Patent Office: 565 Days
• CPC Class Codes: C08F 212/08 Styrene
• CPC Class Codes: C08F 212/12 Monomers containing a branched unsaturated aliphatic radical or a ring substituted by an alkyl radical
• CPC Class Codes: C08F 220/18 with acrylic or methacrylic acids
• CPC Class Codes: C08F 220/1802 C2-(meth)acrylate, e.g. ethyl (meth)acrylate
• CPC Class Codes: C08F 220/1804 C4-(meth)acrylate, e.g. butyl (meth)acrylate, isobutyl (meth)acrylate or tert-butyl (meth)acrylate
• CPC Class Codes: C08F 220/1806 C6-(meth)acrylate, e.g. (cyclo)hexyl (meth)acrylate or phenyl (meth)acrylate
• CPC Class Codes: C08F 220/1808 C8-(meth)acrylate, e.g. isooctyl (meth)acrylate or 2-ethylhexyl (meth)acrylate
• CPC Class Codes: C08F 255/02 on to polymers of olefins having two or three carbon atoms
• CPC Class Codes: C08L 51/06 grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
• CPC Class Codes: C08L 67/02 Polyesters derived from dicarboxylic acids and dihydroxy compounds C08L67/06 takes precedence
• CPC Class Codes: C08L 67/025 containing polyether sequences
• CPC Class Codes: C08L 91/06 Waxes
• CPC Class Codes: G03G 9/081 by mixing the toner components in a liquefied state; melt kneading; reactive mixing
• 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 9/08755 Polyesters
• CPC Class Codes: G03G 9/08782 Waxes
• CPC Class Codes: G03G 9/0918 Phthalocyanine dyes

Abstract

A toner production method including: a melt-kneading step of melt-kneading a resin composition including a binder resin, a colorant, a wax, and a wax dispersant to obtain a melt-kneaded product; and a pulverizing step of pulverizing the melt-kneaded product. Where the temperature of the melt-kneaded product at the end of the melt-kneading step is Tk (° C.), and the softening point of the wax dispersant is Tm (° C.), the relationship of −18≤[Tk−Tm]≤10 is satisfied. The wax dispersant is a polymer in which a styrene acrylic polymer is graft-polymerized to a polyolefin. The styrene acrylic polymer has a monomer unit derived from α-methylstyrene and a monomer unit derived from a cycloalkyl (meth)acrylate.

Claims

1. A toner production method comprising:

a melt-kneading step of melt-kneading a resin composition including a binder resin, a colorant, a wax, and a wax dispersant to obtain a melt-kneaded product; and

a pulverizing step of pulverizing the melt-kneaded product, wherein

−

18≤

[Tk−

Tm]≤

10 where a temperature of the melt-kneaded product at an end of the melt-kneading step is Tk (°

C.), and a softening point of the wax dispersant is Tm (°

C.),

the wax dispersant is a polymer in which a styrene acrylic polymer is grafted to a polyolefin,

the styrene acrylic polymer has a monomer unit derived from α

-methylstyrene and a monomer unit derived from a cycloalkyl (meth)acrylate,

the monomer unit derived from the cycloalkyl (meth)acrylate is represented by formula (2)

2. The toner production method according to claim 1, wherein an amount of the monomer unit derived from α

-methylstyrene in the polymer is 5.0 to 30.0% by mass.

3. The toner production method according to claim 1, wherein the softening point of the wax dispersant is 100.0 to 130.0°

C.

4. The toner production method according to claim 1, wherein the styrene acrylic polymer further has a monomer unit represented by formula (3)

5. The toner production method according to claim 1, wherein the monomer unit derived from the cycloalkyl (meth)acrylate is derived from cyclohexyl methacrylate.

6. The toner production method according to claim 1, wherein the polyolefin is polypropylene having a melting point of 70 to 90°

C.

7. The toner production method according to claim 1, wherein the amount of the polymer is 1.0 to 10.0 parts by mass with respect to 100 parts by mass of the binder resin.