EP0417812A2
Expired / Lapsed
EP
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Electrostatic image developing toner and process for its production, and binder resin and process for its production
Assignee: Canon Inc
•
Filing: 1990-09-14
•
Granted: —
•
Expires: 2010-09-14
Abstract
Abstract The present invention provide a toner for developing an electrostatic image. The toner comprises a binder resin and a coloring agent. The binder resin comprises a styrene type binder resin. The amount of an aldehyde contained in the binder resin is not more than 0.005 % by weight based on the weight of the toner. The binder resin is produced by a process comprising the steps of preparing a monomer composition comprising a polymerizable monomer containing at least not less than 50 % by weight of a styrene monomer, and a polymerization initiator, and subjecting said monomer composition to suspension polymerization in an aqueous medium having dissolved oxygen in an amount of not more than 2.5 mg/lit to form a styrene polymer or copolymer containing an aldehyde monomer in an amount of not more than 0.01 % by weight.
Inventors
- 👤 Yoshihiko Hyosu
- 👤 Seiichi Takagi
- 👤 Hiroyuki Suematsu
- 👤 Manabu Ohno
- 👤 Tetsuhito Kuwashima
- 👤 Eiichi Imai
- 👤 Yoshinobu Nagai
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 02:04
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08702; G03G9/08706; G03G9/08708; G03G9/08711; G03G9/08784; G03G9/08793; G03G9/097; G03G9/09733
Claims Analysis
Total Claims: 63
Claim 1
Independent Claim
50 words
A toner for developing an electrostatic image, comprising a binder resin and a coloring agent, said binder resin comprising a styrene type binder resin; wherein an aldehyde is contained in said toner in an amount of not more than 0.005 % by weight based on the weight of the toner.
Claim 2
Dependent Claim
50 words
A toner for developing an electrostatic image, comprising a binder resin and a coloring agent, said binder resin comprising a styrene type binder resin; wherein an aldehyde is contained in said toner in an amount of not more than 0.005 % by weight based on the weight of the toner.
Claim 3
Dependent Claim
16 words
The toner according to Claim 1, wherein said styrene type binder resin contains a THF-insoluble matter.
Claim 4
Dependent Claim
24 words
The toner according to Claim 1, wherein said styrene type binder resin comprises a cross-linked styrene polymer or styrene copolymer, or a mixture thereof.
Claim 5
Dependent Claim
41 words
The toner according to Claim 1, wherein said styrene type binder resin contains a THF-insoluble matter, and contains an aldehyde in an amount of not more than 0.01 % by weight based on the weight of the styrene type binder resin.
Claim 6
Dependent Claim
43 words
The toner according to Claim 4, wherein said styrene type binder resin comprises a cross- linked styrene resin, and contains an aldehyde in an amount of not more than 0.005 % by weight based on the weight of the styrene type binder resin.
Claim 7
Dependent Claim
11 words
The toner according to Claim 5, wherein said aldehyde comprises benzaldehyde.
Claim 8
Dependent Claim
27 words
The toner according to Claim 1, wherein said styrene type binder resin comprises a styrene polymer or styrene copolymer prepared by suspension polymerization, or a mixture thereof.
Claim 9
Dependent Claim
29 words
The toner according to Claim 1, wherein said aldehyde is contained in an amount of not more than 0.004 % by weight based on the weight of the toner.
Claim 10
Dependent Claim
14 words
The toner according to Claim 1, wherein said coloring agent comprises a magnetic material.
Claim 11
Dependent Claim
33 words
The toner according to Claim 9, wherein said magnetic material is contained in an amount of from 30 to 150 parts by weight based on 100 parts by weight of the binder resin.
Claim 12
Dependent Claim
33 words
The toner according to Claim 9, wherein said magnetic material is contained in an amount of from 40 to 100 parts by weight based on 100 parts by weight of the binder resin.
Claim 13
Dependent Claim
20 words
The toner according to Claim 1, wherein said coloring agent comprises at least one of a dye and a pigment.
Claim 14
Dependent Claim
31 words
The toner according to Claim 12, wherein said coloring agent is contained in an amount of from 5 to 20 % by weight based on the weight of the binder resin.
Claim 15
Dependent Claim
16 words
The toner according to Claim 1, wherein said styrene type binder resin is cross-linked with divinylbenzene.
Claim 16
Dependent Claim
16 words
The toner according to Claim 1, wherein said styrene type binder resin comprises a styrene/acrylate copolymer.
Claim 17
Dependent Claim
16 words
The toner according to Claim 1, wherein said styrene type binder resin comprises a styrene/methacrylate copolymer.
Claim 18
Dependent Claim
22 words
The toner according to Claim 1, wherein said binder resin contains from 10 to 70 % by weight of a THF-insoluble matter.
Claim 19
Dependent Claim
22 words
The toner according to Claim 1, wherein said binder resin contains from 10 to 60 % by weight of a THF-insoluble matter.
Claim 20
Dependent Claim
109 words
The toner according to Claim 1, wherein said binder resin i) has a weight average molecular weight/number average molecular weight (Mw/Mn) of ≧ 5, at least one peak in the region of a molecular weight of from 2,000 to 10,000 and at least one peak or shoulder in the region of a molecular weight of from 15,000 to 100,000, in the molecular weight distribution measured by gel permeation chromatography (GPC) of a THF-soluble matter in the binder resin, and ii) contains a component with a molecular weight of not more than 10,000 in an amount of from 10 to 50 % by weight based on the THF-soluble resin composition.
Claim 21
Dependent Claim
22 words
The toner according to Claim 19, wherein said binder resin contains from 10 to 70 % by weight of a THF-insoluble matter.
Claim 22
Dependent Claim
22 words
The toner according to Claim 19, wherein said binder resin contains from 10 to 60 % by weight of a THF-insoluble matter.
Claim 23
Dependent Claim
33 words
The toner according to Claim 19, wherein said binder resin comprises a styrene type binder resin cross-linked with a cross-linking agent, and the cross-linked styrene type binder resin is prepared by suspension polymerization.
Claim 24
Dependent Claim
66 words
A process for producing a toner, comprising melt-kneading a mixture containing at least a coloring agent and a styrene type binder resin containing an aldehyde in an amount of not more than 0.01 % by weight, cooling the melt-kneaded product to obtain a cooled product, and pulverizing the cooled product; said toner containing the aldehyde in an amount of not more than 0.005 % by weight.
Claim 25
Dependent Claim
66 words
A process for producing a toner, comprising melt-kneading a mixture containing at least a coloring agent and a styrene type binder resin containing an aldehyde in an amount of not more than 0.01 % by weight, cooling the melt-kneaded product to obtain a cooled product, and pulverizing the cooled product; said toner containing the aldehyde in an amount of not more than 0.005 % by weight.
Claim 26
Dependent Claim
19 words
The process according to Claim 23, wherein said mixture is melt-kneaded at a temperature of from 90 to 180°C.
Claim 27
Dependent Claim
31 words
The process according to Claim 23, wherein said styrene type binder resin comprises a cross-linked styrene type binder resin, and said cross-linked styrene type binder resin is prepared by suspension polymerization.
Claim 28
Dependent Claim
19 words
The process according to Claim 25, wherein said binder resin comprises a styrene type binder resin cross-linked with divinylbenzene.
Claim 29
Dependent Claim
22 words
The process according to Claim 23, wherein said styrene type binder resin contains not more than 0.01 % by weight of benzaldehyde.
Claim 30
Dependent Claim
41 words
The process according to Claim 23, wherein said coloring agent comprises a magnetic material, and the magnetic material is used in an amount of from 30 to 150 parts by weight based on 100 parts by weight of the binder resin.
Claim 31
Dependent Claim
47 words
The process according to Claim 23, wherein said coloring agent comprises at least one of a dye and a pigment, and the dye or the pigment is used in an amount of from 5 to 20 % by weight based on the weight of the binder resin.
Claim 32
Dependent Claim
62 words
A binder resin comprising a styrene polymer, a styrene copolymer, a mixture of a styrene polymer and a styrene copolymer or a mixture of styrene copolymers, containing not less than 50 % by weight of a styrene unit; wherein an aldehyde is contained in an amount of not smore than 0.01 % by weight based on the weight of said binder resin.
Claim 33
Dependent Claim
62 words
A binder resin comprising a styrene polymer, a styrene copolymer, a mixture of a styrene polymer and a styrene copolymer or a mixture of styrene copolymers, containing not less than 50 % by weight of a styrene unit; wherein an aldehyde is contained in an amount of not smore than 0.01 % by weight based on the weight of said binder resin.
Claim 34
Dependent Claim
23 words
The binder resin according to Claim 30, wherein said aldehyde is contained in an amount of not more than 0.005 % by weight.
Claim 35
Dependent Claim
16 words
The binder resin according to Claim 30, wherein said styrene copolymer comprises a cross-linked styrene copolymer.
Claim 36
Dependent Claim
25 words
The binder resin according to Claim 30, wherein said styrene polymer comprises an uncrosslinked styrene polymer and said styrene copolymer comprises a cross-linked styrene copolymer.
Claim 37
Dependent Claim
139 words
The binder resin according to Claim 30, wherein said styrene polymer, styrene copolymer, mixture of a styrene polymer and a styrene copolymer or mixture of styrene copolymers i) contains from 10 to 70 % by weight of a THF-insoluble matter, ii) has a weight average molecular weight/number average molecular weight (Mw/Mn) of ≧ 5, at least one peak in the region of a molecular weight of from 2,000 to 10,000 and at least one peak or shoulder in the region of a molecular weight of from 15,000 to 100,000, in the molecular weight distribution measured by gel permeation chromatography (GPC) of a THF-soluble matter in the binder resin, and iii) contains a component with a molecular weight of not more than 10,000 in an amount of from 10 to 50 % by weight based on the THF-soluble resin composition.
Claim 38
Dependent Claim
24 words
The binder resin according to Claim 34, wherein said THF-insoluble matter is contained in an amount of from 10 to 60 % by weight.
Claim 39
Dependent Claim
20 words
The binder resin according to Claim 34, wherein said styrene copolymer comprises a cross-linked styrene copolymer prepared by suspension polymerization.
Claim 40
Dependent Claim
33 words
The binder resin according to Claim 34, wherein said styrene polymer comprises an uncrosslinked styrene polymer prepared by solution polymerization, and said styrene copolymer comprises a cross-linked styrene copolymer prepared by suspension polymerization.
Claim 41
Dependent Claim
31 words
The binder resin according to Claim 34, wherein said mixture of styrene copolymers comprises an uncrosslinked styrene copolymer prepared by solution polymerization, and a cross-linked styrene copolymer prepared by suspension polymerization.
Claim 42
Dependent Claim
15 words
The binder resin according to Claim 34, wherein said styrene copolymer comprises a styrene/acrylate copolymer.
Claim 43
Dependent Claim
15 words
The binder resin according to Claim 34, wherein said styrene copolymer comprises a styrene/methacrylate copolymer.
Claim 44
Dependent Claim
83 words
A process for producing a binder resin, comprising the steps of preparing a monomer composition comprising a polymerizable monomer containing at least not less than 50 % by weight of a styrene monomer, and a polymerization initiator, and subjecting said monomer composition to suspension polymerization in an aqueous medium having dissolved oxygen in an amount of not more than 2.5 mg/lit to form a styrene polymer or copolymer containing an aldehyde monomer in an amount of not more than 0.01 % by weight.
Claim 45
Dependent Claim
83 words
A process for producing a binder resin, comprising the steps of preparing a monomer composition comprising a polymerizable monomer containing at least not less than 50 % by weight of a styrene monomer, and a polymerization initiator, and subjecting said monomer composition to suspension polymerization in an aqueous medium having dissolved oxygen in an amount of not more than 2.5 mg/lit to form a styrene polymer or copolymer containing an aldehyde monomer in an amount of not more than 0.01 % by weight.
Claim 46
Dependent Claim
33 words
The process according to Claim 41, wherein said monomer composition is subjected to the suspension polymerization in an aqueous medium containing a dissolved oxygen in an amount of not more than 2.0 mg/lit.
Claim 47
Dependent Claim
20 words
The process according to Claim 41, wherein said monomer composition is polymerized at a temperature of from 50 to 95°C.
Claim 48
Dependent Claim
16 words
The process according to Claim 41, wherein said monomer composition contains a cross-linking agent comprising divinylbenzene.
Claim 49
Dependent Claim
12 words
The process according to claim 41, wherein said monomer composition contains divinylbenzene.
Claim 50
Dependent Claim
30 words
The process according to Claim 41, wherein said polymerizable monomer contains a styrene monomer in an amount of not less than 50 % by weight, an acrylate monomer, and divinylbenzene.
Claim 51
Dependent Claim
30 words
The process according to Claim 41, wherein said polymerizable monomer contains a styrene monomer in an amount of not less than 50 % by weight, a methacrylate monomer, and divinylbenzene.
Claim 52
Dependent Claim
35 words
The process according to Claim 41, wherein said monomer composition comprises a resin dissolved in an amount of from 10 to 120 parts by weight based on 100 parts by weight of the polymerizable monomer.
Claim 53
Dependent Claim
35 words
The process according to Claim 41, wherein said monomer composition comprises a resin dissolved in an amount of from 20 to 100 parts by weight based on 100 parts by weight of the polymerizable monomer.
Claim 54
Dependent Claim
22 words
The process according to Claim 49, wherein said resin comprises an uncrosslinked styrene polymer or uncrosslinked styrene copolymer prepared by solution polymerization.
Claim 55
Dependent Claim
30 words
The process according to Claim 41, wherein said monomer composition contains a cross-linking agent in an amount of from 0.1 to 2.0 % by weight based on the polymerizable monomer.
Claim 56
Dependent Claim
37 words
The process according to Claim 41, wherein said polymerizable monomer is contained in the monomer composition in an amount of not more than 100 parts by weight based on 100 parts by weight of said aqueous medium.
Claim 57
Dependent Claim
37 words
The process according to Claim 41, wherein said polymerizable monomer is contained in the monomer composition in an amount of from 10 to 90 parts by weight based on 100 parts by weight of said aqueous medium.
Claim 58
Independent Claim
123 words
An apparatus unit comprising an electrostatically chargeable member for supporting thereon an electrostatic image, a means for electrostatically charging the chargeable member, and a developing means for developing an electrostatic image supported on said chargeable member; wherein said developing means has a toner for developing an electrostatic image, comprising a styrene type binder resin and a coloring agent; wherein an aldehyde is contained in said toner in an amount of not more than 0.005 % by weight based on the weight of the toner, and said charging means and developing means are integrally held together with said chargeable member to form a unit so that a single unit capable of being freely mounted on and detached from an apparatus main body is formed.
Claim 59
Independent Claim
123 words
An apparatus unit comprising an electrostatically chargeable member for supporting thereon an electrostatic image, a means for electrostatically charging the chargeable member, and a developing means for developing an electrostatic image supported on said chargeable member; wherein said developing means has a toner for developing an electrostatic image, comprising a styrene type binder resin and a coloring agent; wherein an aldehyde is contained in said toner in an amount of not more than 0.005 % by weight based on the weight of the toner, and said charging means and developing means are integrally held together with said chargeable member to form a unit so that a single unit capable of being freely mounted on and detached from an apparatus main body is formed.
Claim 60
Dependent Claim
23 words
The apparatus unit according to Claim 54, wherein said toner comprises at least one of the toners according to Claims 2 to 22.
Claim 61
Dependent Claim
103 words
A facsimile apparatus comprising an electrophotographic apparatus and a means for receiving image information from a remote terminal; wherein said electrophotographic apparatus comprising an electrostatically chargeable member for supporting thereon an electrostatic image, a means for electrostatically charging the chargeable member, and a developing means for developing an electrostatic image supported on said chargeable member; wherein said developing means has a toner for developing an electrostatic image, comprising a styrene type binder resin and a coloring agent; wherein an aldehyde is contained in said toner in an amount of not more than 0.005 % by weight based on the weight of the toner.
Claim 62
Dependent Claim
103 words
A facsimile apparatus comprising an electrophotographic apparatus and a means for receiving image information from a remote terminal; wherein said electrophotographic apparatus comprising an electrostatically chargeable member for supporting thereon an electrostatic image, a means for electrostatically charging the chargeable member, and a developing means for developing an electrostatic image supported on said chargeable member; wherein said developing means has a toner for developing an electrostatic image, comprising a styrene type binder resin and a coloring agent; wherein an aldehyde is contained in said toner in an amount of not more than 0.005 % by weight based on the weight of the toner.
Claim 63
Dependent Claim
23 words
The facsimile apparatus according to Claim 56, wherein said toner comprises at least one of the toners according to Claims 2 to 22.
References Cited (Backward Citations)
No citation records indexed.
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