CA2630933A1 - Electrostatic image developing toner, two-component developer, image forming method and process cartridge - Google Patents

Electrostatic image developing toner, two-component developer, image forming method and process cartridge Download PDF

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Publication number
CA2630933A1
CA2630933A1 CA002630933A CA2630933A CA2630933A1 CA 2630933 A1 CA2630933 A1 CA 2630933A1 CA 002630933 A CA002630933 A CA 002630933A CA 2630933 A CA2630933 A CA 2630933A CA 2630933 A1 CA2630933 A1 CA 2630933A1
Authority
CA
Canada
Prior art keywords
toner
image
bearing member
range
unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002630933A
Other languages
French (fr)
Other versions
CA2630933C (en
Inventor
Kumi Hasegawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Co Ltd
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2006238768A external-priority patent/JP2008058883A/en
Priority claimed from JP2006247913A external-priority patent/JP2008070523A/en
Application filed by Individual filed Critical Individual
Publication of CA2630933A1 publication Critical patent/CA2630933A1/en
Application granted granted Critical
Publication of CA2630933C publication Critical patent/CA2630933C/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/0819—Developers with toner particles characterised by the dimensions of the particles
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
    • G03G21/10—Collecting or recycling waste developer
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/0821—Developers with toner particles characterised by physical parameters
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/087—Binders for toner particles
    • G03G9/08702—Binders for toner particles comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • G03G9/08706—Polymers of alkenyl-aromatic compounds
    • G03G9/08708—Copolymers of styrene
    • G03G9/08711—Copolymers of styrene with esters of acrylic or methacrylic acid
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/087—Binders for toner particles
    • G03G9/08702—Binders for toner particles comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • G03G9/08722—Polyvinylalcohols; Polyallylalcohols; Polyvinylethers; Polyvinylaldehydes; Polyvinylketones; Polyvinylketals
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/087—Binders for toner particles
    • G03G9/08702—Binders for toner particles comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • G03G9/08724—Polyvinylesters
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/087—Binders for toner particles
    • G03G9/08702—Binders for toner particles comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • G03G9/08726—Polymers of unsaturated acids or derivatives thereof
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/087—Binders for toner particles
    • G03G9/08742—Binders for toner particles comprising macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • G03G9/08755—Polyesters
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/087—Binders for toner particles
    • G03G9/08784—Macromolecular material not specially provided for in a single one of groups G03G9/08702 - G03G9/08775
    • G03G9/08786—Graft polymers
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/087—Binders for toner particles
    • G03G9/08784—Macromolecular material not specially provided for in a single one of groups G03G9/08702 - G03G9/08775
    • G03G9/08788—Block polymers
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/087—Binders for toner particles
    • G03G9/08784—Macromolecular material not specially provided for in a single one of groups G03G9/08702 - G03G9/08775
    • G03G9/08795—Macromolecular material not specially provided for in a single one of groups G03G9/08702 - G03G9/08775 characterised by their chemical properties, e.g. acidity, molecular weight, sensitivity to reactants
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/087—Binders for toner particles
    • G03G9/08784—Macromolecular material not specially provided for in a single one of groups G03G9/08702 - G03G9/08775
    • G03G9/08797—Macromolecular material not specially provided for in a single one of groups G03G9/08702 - G03G9/08775 characterised by their physical properties, e.g. viscosity, solubility, melting temperature, softening temperature, glass transition temperature

Abstract

To provide a toner including: toner particles which comprise: a colorant, a releasing agent, and a binder resin, wherein the number average particle diameter of the toner particles is in the range of from 3.5 µm to 6.5 µm where the number average particle diameter (D1) is determined by the Coulter method, the variation coefficient of the number distribution of the toner particles is in the range of 22.0 to 35.0 where the variation coefficient is found by dividing the standard deviation of the number distribution by the number average particle diameter (D1), and 40% by number to 59% by number of the toner particles are in 4.0 µm to 8.0 µm in diameter.

Claims (16)

1. A toner, comprising:
a colorant, a releasing agent, and a binder resin, wherein the number average particle diameter (D1) of the toner is in the range of from 3.5 µm to 6.5 µm as determined by the Coulter method, the variation coefficient of the number distribution of the toner is in the range of 22.0 to 35.0, the variation coefficient being found by dividing the standard deviation of the number distribution by the number average particle diameter (D1), and 40% by number to 59% by number of the toner are 4.0 µm to 8.0 µm in diameter.
2. The toner according to claim 1, wherein 15% by number to 35% by number of the toner are 4.0 µm to 5.0 µm in diameter.
3. The toner according to one of claims 1 and 2, wherein the weight average particle diameter (D4) of the toner is in the range of 3.5 µm to 5.5 µm.
4. The toner according to any one of Claims 1 to 3, wherein the ratio of D4 to D1 is in the range of from 1.04 to 1.30.
5. The toner according to any one of Claims 1 to 4, wherein the loose apparent density of the toner is in the range of 0.30 g/cm3 to 0.39 g/cm3.
6. The toner according to any one of Claims 1 to 5, wherein the binder resin contains a polyester resin produced by using an inorganic tin (II) compound as a catalyst, and the peak top molecular weight (Mp) of the toner is in the range of 4,000 to 8,000, as determined by gel permeation chromatography (GPC).
7. The toner according to any one of Claims 1 to 6, wherein the 1/2 flow temperature of the toner is in the range of 145 °C to 165 °C, the 1/2 flow temperature being determined with a flow tester.
8. The toner according to any one of Claims 1 to 7, wherein the binder resin contains a hybrid resin composed of a vinyl polymerization unit and a polyester unit that is produced by using the inorganic tin (II) compound as a catalyst, and the content A of the hybrid resin and the content B of the releasing agent satisfy the condition:

(1/2) × B <= A <= 3.
9. The toner according to any one of Claims 6 to 8, wherein the inorganic tin (II) compound is tin (II) octylate.
10. A two-component developer, comprising the toner according to any one of Claims 1 to 9, and a carrier.
11. An image forming method, comprising:
charging a surface of an image bearing member, exposing the surface to form a latent electrostatic image, developing the latent electrostatic image into a visible image with a toner, transferring the visible image to a recording medium, fixing the thus transferred visible image onto the recording medium, and removing remaining toner from the surface, wherein the toner is any one of the toners according to Claims 1 to 9.
12. The image forming method according to Claim 11, further comprising collecting the removed toner to reuse the same in developing a latent electrostatic image.
13. The image forming method according to one of Claims 11 and 12, wherein the recording medium is fed in between a fixing roller and a pressure roller to fix the visible image, the fixing roller applying heat to the recording medium to fix the visible image, the wall thickness of the fixing roller being 1.0 mm or thinner, and pressure applied to a unit area of the surface of one of the rollers by the surface of the other roller is 1.5 × 10 5 Pa or lower, where the pressure is calculated by dividing load between the rollers by the contact area thereof.
14. The image forming method according to any one of Claims 11 to 13, wherein the removing of the remaining toner is performed with a cleaning unit configured to clean the surface of the image bearing member, the cleaning unit comprising a first cleaning blade and a second cleaning blade which are located at the upstream and downstream, respectively, of the rotation direction of the image bearing member, the second cleaning blade being composed of a base and an abrasive particle-containing layer as a sanding blade.
15. A process cartridge, comprising:

a latent electrostatic image bearing member, a developing unit, and a cleaning unit, wherein the developing unit is configured to develop a latent electrostatic image on a surface of the image bearing member with a toner to form the image into a visible image, the cleaning unit is configured to remove remaining toner from the surface of the image bearing member, and the toner is any one of the toners according to Claims 1 to 9.
16. The process cartridge according to Claim 15, wherein the cleaning unit is configured to clean the surface of the image bearing member, the cleaning unit comprising a first cleaning blade and a second cleaning blade which are located at the upstream and downstream, respectively, of the rotation direction of the image bearing member, the second cleaning blade being composed of a base layer and an abrasive particle-containing layer as a sanding blade.
CA2630933A 2006-09-04 2007-08-30 Electrostatic image developing toner, two-component developer, image forming method and process cartridge Active CA2630933C (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP2006238768A JP2008058883A (en) 2006-09-04 2006-09-04 Toner for electrostatic charge image development, two-component developer, image forming method and process cartridge
JP2006-238768 2006-09-04
JP2006-247913 2006-09-13
JP2006247913A JP2008070523A (en) 2006-09-13 2006-09-13 Cleaning device and image forming method
PCT/JP2007/067353 WO2008029863A1 (en) 2006-09-04 2007-08-30 Electrostatic image developing toner, two-component developer, image forming method and process cartridge

Publications (2)

Publication Number Publication Date
CA2630933A1 true CA2630933A1 (en) 2008-03-13
CA2630933C CA2630933C (en) 2012-08-28

Family

ID=39157289

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2630933A Active CA2630933C (en) 2006-09-04 2007-08-30 Electrostatic image developing toner, two-component developer, image forming method and process cartridge

Country Status (6)

Country Link
US (1) US8084179B2 (en)
EP (1) EP2059856B1 (en)
KR (1) KR100987744B1 (en)
AU (1) AU2007292107B2 (en)
CA (1) CA2630933C (en)
WO (1) WO2008029863A1 (en)

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Also Published As

Publication number Publication date
EP2059856A1 (en) 2009-05-20
US20090202934A1 (en) 2009-08-13
KR20080086431A (en) 2008-09-25
WO2008029863A1 (en) 2008-03-13
KR100987744B1 (en) 2010-10-18
EP2059856B1 (en) 2016-05-25
EP2059856A4 (en) 2011-08-31
US8084179B2 (en) 2011-12-27
CA2630933C (en) 2012-08-28
AU2007292107B2 (en) 2011-04-14
AU2007292107A1 (en) 2008-03-13

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