TONER PRODUCTION METHOD AND POLYMER

• US 20180052402A1
• Filed: 08/10/2017
• Published: 02/22/2018
• 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, lshigami, Koh, Mizo, Yuichi
• Granted Patent: US 10,216,108 B2
• Time in Patent Office: 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

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 Tk and the Tm satisfy the relationship of the following formula (1); and

the wax dispersant is a polymer in which a styrene acrylic polymer is graft-polymerized to a polyolefin; and

moreover

the styrene acrylic polymer has a monomer unit derived from α

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

−

18≦

[Tk−

Tm]≦

10 

 

formula (1).

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

-methylstyrene in the polymer is at least 5.0% by mass and not more than 30.0% by mass.

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

C. and not more than 130.0°

C.

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

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

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

C. and not more than 90°

C.

7. The toner production method according to claim 1, wherein the amount of the polymer is at least 1.0 part by mass and not more than 10.0 parts by mass with respect to 100 parts by mass of the binder resin.

8. A polymer in which a styrene acrylic polymer is graft-polymerized to a polyolefin, wherein the styrene acrylic polymer has a monomer unit derived from α

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

9. The polymer according to claim 8, wherein an amount of the monomer unit derived from α

-methylstyrene in the polymer is at least 5.0% by mass and not more than 30.0% by mass.

10. The polymer according to claim 8, wherein the styrene acrylic polymer has a monomer unit represented by the following formula (3):

11. The polymer according to claim 8, wherein the monomer unit derived from the cycloalkyl (meth)acrylate is a monomer unit derived from cyclohexyl methacrylate.

12. The polymer according to claim 8, wherein a softening point of the polymer is at least 100.0°

C. and not more than 130.0°

C.

13. The polymer according to claim 8, wherein the polyolefin is polypropylene, and a melting point of the polypropylene is at least 70°

C. and not more than 90°

C.