EP0621513A2
Expired / Lapsed
EP
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Toner for developing electrostatic image, image forming apparatus and process cartridge
Assignee: Canon Inc
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Filing: 1994-04-19
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Granted: —
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Expires: 2014-04-19
Abstract
Abstract A toner for developing an electrostatic image is constituted by at least a binder resin and a charge control agent. The binder resin has an acid value of 5 - 50. The charge control agent comprises an iron complex represented by the following formula: wherein X 1 and X 2 independently denote hydrogen atom, lower alkyl group, lower alkoxy group, nitro group or halogen atom; m and m' denote an integer of 1 - 3; R 1 and R 3 independently denote hydrogen atom, C 1-18 alkyl or alkenyl, sufonamide, mesyl, sulfonic acid group, carboxy ester group, hydroxy, C 1-18 alkoxy, acetylamino, benzoylamino or halogen atom; n and n' denote an integer of 1 - 3; R 2 and R 4 denote hydrogen atom or nitro group; and A+ denotes hydrogen ion, sodium ion, potassium ion or ammonium ion. The toner has a weight-average particle size (D 4 ) of 4 - 9 µm and including toner particles having a particle size of 5 µm or smaller at 3 - 90 % by number, toner particles having a particle size of 6.35 - 10.08 µm at 1 - 80 % by number and toner particles having a particle size of 12.7 µm or larger at a percentage by volume of at most 2.0 %, wherein the toner particles having a particle size of 5.0 µm or smaller are contained at N % by number and at V % by volume satisfying a relationship: wherein k is a positive number in the range of 3.0 - 7.5.
Inventors
- 👤 Masaaki C/O Canon Kabushiki Kaisha Taya
- 👤 Takaaki C/O Canon Kabushiki Kaisha Kohtaki
- 👤 Makoto C/O Canon Kabushiki Kaisha Unno
- 👤 Tadashi C/O Canon Kabushiki Kaisha Doujo
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 13:17
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08742; G03G9/08755; G03G9/0819; G03G9/09; G03G9/0906; G03G9/091
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
255 words
A toner for developing an electrostatic image, comprising: at least a binder resin and a charge control agent; the binder resin having an acid value of 5 - 50; the charge control agent comprising an iron complex represented by the following formula: wherein X 1 and X 2 independently denote hydrogen atom, lower alkyl group, lower alkoxy group, nitro group or halogen atom; m and m' denote an integer of 1 - 3; R 1 and R 3 independently denote hydrogen atom, C l -18 alkyl or alkenyl, sufonamide, mesyl, sulfonic acid group, carboxy ester group, hydroxy, C 1-18 alkoxy, acetylamino, benzoylamino or halogen atom; n and n' denote an integer of 1 - 3; R 2 and R 4 denote hydrogen atom or nitro group; and A° denotes hydrogen ion, sodium ion, potassium ion or ammonium ion; the toner having a weight-average particle size (D 4 ) of 4 - 9 µm and including toner particles having a particle size of 5 µm or smaller at 3 - 90 % by number, toner particles having a particle size of 6.35 - 10.08 µm at 1 - 80 % by number and toner particles having a particle size of 12.7 µm or larger at a percentage by volume of at most 2.0 %, wherein the toner particles having a particle size of 5.0 µm or smaller are contained at N % by number and at V % by volume satisfying a relationship: wherein k is a positive number in the range of 3.0 - 7.5.
Claim 2
Dependent Claim
255 words
A toner for developing an electrostatic image, comprising: at least a binder resin and a charge control agent; the binder resin having an acid value of 5 - 50; the charge control agent comprising an iron complex represented by the following formula: wherein X 1 and X 2 independently denote hydrogen atom, lower alkyl group, lower alkoxy group, nitro group or halogen atom; m and m' denote an integer of 1 - 3; R 1 and R 3 independently denote hydrogen atom, C l -18 alkyl or alkenyl, sufonamide, mesyl, sulfonic acid group, carboxy ester group, hydroxy, C 1-18 alkoxy, acetylamino, benzoylamino or halogen atom; n and n' denote an integer of 1 - 3; R 2 and R 4 denote hydrogen atom or nitro group; and A° denotes hydrogen ion, sodium ion, potassium ion or ammonium ion; the toner having a weight-average particle size (D 4 ) of 4 - 9 µm and including toner particles having a particle size of 5 µm or smaller at 3 - 90 % by number, toner particles having a particle size of 6.35 - 10.08 µm at 1 - 80 % by number and toner particles having a particle size of 12.7 µm or larger at a percentage by volume of at most 2.0 %, wherein the toner particles having a particle size of 5.0 µm or smaller are contained at N % by number and at V % by volume satisfying a relationship: wherein k is a positive number in the range of 3.0 - 7.5.
Claim 3
Dependent Claim
14 words
The toner according to Claim 1, wherein the binder resin comprises a polyester resin.
Claim 4
Dependent Claim
39 words
The toner according to Claim 2, wherein the polyester resin has a glass transition point of 40 - 90 °C, a number-average molecular weight (Mn) of 1,500 - 50,000, and a weight-average molecular weight (Mw) of 10,000 - 5,000,000.
Claim 5
Dependent Claim
33 words
The toner according to Claim 3, wherein the polyester resin has a glass transition point of 45 - 85 °C, an Mn of 2,000 - 20,000 and an Mw of 15,000 - 3,000,000.
Claim 6
Dependent Claim
18 words
The toner according to Claim 2, wherein the polyester resin has an OH value of at most 50.
Claim 7
Dependent Claim
18 words
The toner according to Claim 5, wherein the polyester resin has an OH value of at most 30.
Claim 8
Dependent Claim
14 words
The toner according to Claim 1, wherein the binder resin comprises a vinyl copolymer.
Claim 9
Dependent Claim
39 words
The toner according to Claim 7, wherein the vinyl copolymer has a glass transition point of 40 - 90 °C, a number-average molecular weight (Mn) of 1,500 - 50,000, and a weight-average molecular weight (Mw) of 10,000 - 5,000,000.
Claim 10
Dependent Claim
33 words
The toner according to Claim 8, wherein the vinyl copolymer has a glass transition point of 45 - 85 °C, an Mn of 2,000 - 20,000 and an Mw of 15,000 - 3,000,000.
Claim 11
Dependent Claim
18 words
The toner according to Claim 7, wherein the vinyl copolymer has an OH value of at most 50.
Claim 12
Dependent Claim
18 words
The toner according to Claim 10, wherein the vinyl copolymer has an OH value of at most 30.
Claim 13
Dependent Claim
18 words
The toner according to Claim 1, wherein the binder resin has an acid value of 6 - 45.
Claim 14
Dependent Claim
18 words
The toner according to Claim 12, wherein the binder resin has an acid value of 7 - 40.
Claim 15
Dependent Claim
27 words
The toner according to Claim 1, wherein the binder resin comprises at least 50 wt. % of a resin having an acid value of 5 - 50.
Claim 16
Dependent Claim
27 words
The toner according to Claim 14, wherein the binder resin comprises at least 60 wt. % of the resin having an acid value of 5 - 50.
Claim 17
Dependent Claim
68 words
The toner according to Claim 1, wherein toner particles having a particle size of 5 µm or smaller are contained at 5 - 80 % by number, toner particles having a particle size of 6.35 - 10.08 µm are contained at 5 - 70 % by number, and toner particles having a particle size of 12.7 µm are larger are contained at at most 1.0 % by volume.
Claim 18
Dependent Claim
48 words
The toner according to Claim 16, wherein toner particles having a particle size of 5 µm or smaller are contained at 9 - 75 % by number, and toner particles having a particle size of 12.7 µm are larger are contained at at most 0.5 % by volume.
Claim 19
Dependent Claim
20 words
The toner according to Claim 1, wherein N satisfies 5 < N 80, and k satisfies 3.1 ≦ k 7.4.
Claim 20
Dependent Claim
20 words
The toner according to Claim 18, wherein N satisfies 9 ≦ N 75, and k satisfies 3.2 ≦ k 7.3.
Claim 21
Dependent Claim
29 words
The toner according to Claim 1, wherein the iron complex is contained in a proportion of 0.1 - 10 wt. parts per 100 wt. parts of the binder resin.
Claim 22
Dependent Claim
29 words
The toner according to Claim 20, wherein the iron complex is contained in a proportion of 0.1 - 5 wt. parts per 100 wt. parts of the binder resin.
Claim 23
Dependent Claim
26 words
The toner according to Claim 1, wherein the iron complex comprises a compound selected from the group consisting of Iron Complexes (1) - (6) shown below:
Claim 24
Dependent Claim
10 words
The toner according to Claim 1, further comprising a colorant.
Claim 25
Dependent Claim
11 words
The toner according to Claim 1, further comprising a magnetic material.
Claim 26
Dependent Claim
312 words
An image forming apparatus, comprising: an electrostatic image-bearing member for holding an electrostatic image thereon, and a developing apparatus for developing the electrostatic image; said developing apparatus including a developer container for storing a developer and a developer-carrying member for carrying thereon and conveying the developer from the developer container to a developing region confronting the electrostatic image-bearing member; wherein said developer contains a toner comprising at least a binder resin and a charge control agent; the binder resin having an acid value of 5 - 50; the charge control agent comprising an iron complex represented by the following formula: wherein X 1 and X 2 independently denote hydrogen atom, lower alkyl group, lower alkoxy group, nitro group or halogen atom; m and m' denote an integer of 1 - 3; R 1 and R 3 independently denote hydrogen atom, C 1-18 alkyl or alkenyl, sufonamide, mesyl, sulfonic acid group, carboxy ester group, hydroxy, C 1-18 alkoxy, acetylamino, benzoylamino or halogen atom; n and n' denote an integer of 1 - 3; R 2 and R 4 denote hydrogen atom or nitro group; and A° denotes hydrogen ion, sodium ion, potassium ion or ammonium ion; the toner having a weight-average particle size (D 4 ) of 4 - 9 µm and including toner particles having a particle size of 5 µm or smaller at 3 - 90 % by number, toner particles having a particle size of 6.35 - 10.08 µm at 1 - 80 % by number and toner particles having a particle size of 12.7 µm or larger at a percentage by volume of at most 2.0 %, wherein the toner particles having a particle size of 5.0 µm or smaller are contained at N % by number and at V % by volume satisfying a relationship: wherein k is a positive number in the range of 3.0 - 7.5.
Claim 27
Dependent Claim
312 words
An image forming apparatus, comprising: an electrostatic image-bearing member for holding an electrostatic image thereon, and a developing apparatus for developing the electrostatic image; said developing apparatus including a developer container for storing a developer and a developer-carrying member for carrying thereon and conveying the developer from the developer container to a developing region confronting the electrostatic image-bearing member; wherein said developer contains a toner comprising at least a binder resin and a charge control agent; the binder resin having an acid value of 5 - 50; the charge control agent comprising an iron complex represented by the following formula: wherein X 1 and X 2 independently denote hydrogen atom, lower alkyl group, lower alkoxy group, nitro group or halogen atom; m and m' denote an integer of 1 - 3; R 1 and R 3 independently denote hydrogen atom, C 1-18 alkyl or alkenyl, sufonamide, mesyl, sulfonic acid group, carboxy ester group, hydroxy, C 1-18 alkoxy, acetylamino, benzoylamino or halogen atom; n and n' denote an integer of 1 - 3; R 2 and R 4 denote hydrogen atom or nitro group; and A° denotes hydrogen ion, sodium ion, potassium ion or ammonium ion; the toner having a weight-average particle size (D 4 ) of 4 - 9 µm and including toner particles having a particle size of 5 µm or smaller at 3 - 90 % by number, toner particles having a particle size of 6.35 - 10.08 µm at 1 - 80 % by number and toner particles having a particle size of 12.7 µm or larger at a percentage by volume of at most 2.0 %, wherein the toner particles having a particle size of 5.0 µm or smaller are contained at N % by number and at V % by volume satisfying a relationship: wherein k is a positive number in the range of 3.0 - 7.5.
Claim 28
Dependent Claim
23 words
The image forming apparatus according to Claim 25, wherein the developer contains the toner according to any one of Claims 2 to 24.
Claim 29
Dependent Claim
291 words
A process cartridge detachably mountable to a main assembly of an image forming apparatus, comprising an electrostatic image-bearing member and a developing means for developing the electrostatic image formed on the electrostatic image bearing member with a developer; wherein said developer contains a toner comprising at least a binder resin and a charge control agent; the binder resin having an acid value of 5 - 50; the charge control agent comprising an iron complex represented by the following formula: wherein X 1 and X 2 independently denote hydrogen atom, lower alkyl group, lower alkoxy group, nitro group or halogen atom; m and m' denote an integer of 1 - 3; R 1 and R 3 independently denote hydrogen atom, C l -18 alkyl or alkenyl, sufonamide, mesyl, sulfonic acid group, carboxy ester group, hydroxy, Ci-i8 alkoxy, acetylamino, benzoylamino or halogen atom; n and n' denote an integer of 1 - 3; R 2 and R 4 denote hydrogen atom or nitro group; and A+ denotes hydrogen ion, sodium ion, potassium ion or ammonium ion; the toner having a weight-average particle size (D 4 ) of 4 - 9 µm and including toner particles having a particle size of 5 µm or smaller at 3 - 90 % by number, toner particles having a particle size of 6.35 - 10.08 µm at 1 - 80 % by number and toner particles having a particle size of 12.7 µm or larger at a percentage by volume of at most 2.0 %, wherein the toner particles having a particle size of 5.0 µm or smaller are contained at N % by number and at V % by volume satisfying a relationship: wherein k is a positive number in the range of 3.0 - 7.5.
Claim 30
Dependent Claim
291 words
A process cartridge detachably mountable to a main assembly of an image forming apparatus, comprising an electrostatic image-bearing member and a developing means for developing the electrostatic image formed on the electrostatic image bearing member with a developer; wherein said developer contains a toner comprising at least a binder resin and a charge control agent; the binder resin having an acid value of 5 - 50; the charge control agent comprising an iron complex represented by the following formula: wherein X 1 and X 2 independently denote hydrogen atom, lower alkyl group, lower alkoxy group, nitro group or halogen atom; m and m' denote an integer of 1 - 3; R 1 and R 3 independently denote hydrogen atom, C l -18 alkyl or alkenyl, sufonamide, mesyl, sulfonic acid group, carboxy ester group, hydroxy, Ci-i8 alkoxy, acetylamino, benzoylamino or halogen atom; n and n' denote an integer of 1 - 3; R 2 and R 4 denote hydrogen atom or nitro group; and A+ denotes hydrogen ion, sodium ion, potassium ion or ammonium ion; the toner having a weight-average particle size (D 4 ) of 4 - 9 µm and including toner particles having a particle size of 5 µm or smaller at 3 - 90 % by number, toner particles having a particle size of 6.35 - 10.08 µm at 1 - 80 % by number and toner particles having a particle size of 12.7 µm or larger at a percentage by volume of at most 2.0 %, wherein the toner particles having a particle size of 5.0 µm or smaller are contained at N % by number and at V % by volume satisfying a relationship: wherein k is a positive number in the range of 3.0 - 7.5.
Claim 31
Dependent Claim
22 words
The process cartridge according to Claim 27, wherein the developer contains the toner according to any one of Claims 2 - 24.
References Cited (Backward Citations)
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