US4626488A
Expired / Lapsed
US
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Polymeric binder for toner having specific weight distribution
Assignee: Canon Inc
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Filing: 1985-03-21
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Granted: 1986-12-02
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Expires: 2005-03-21
Abstract
Abstract A toner for developing electrostatic image excellent in harmonization of hot roller fixability, anti-offset characteristic and durability is provided by melt-kneading a binder resin and a colorant and pulverizing the kneaded product. The binder resin comprises a polymer having at least three peaks or shoulders in its chromatogram obtained by gel permeation chromatography, wherein the at least three peaks or shoulders include a peak or shoulder A having the largest molecular weight Ma of 2,000 to 80,000, a peak or shoulder C having the smallest molecular weight Mc satisfying, the relationship of Mc/Ma≧150, and a peak or shoulder B having an intermediate molecular weight between the Ma and Mc.
Inventors
- 👤 Sukejiro Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:10
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08702; G03G9/08784; G03G9/08793; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/105
Claims Analysis
Total Claims: 38
Claim 1
Independent Claim
116 words
A binder resin for a toner comprising a polymer having at least three peaks or shoulders in its chromatogram obtained by gel permeation chromatography, wherein said at least three peaks or shoulders include a peak or shoulder A having the smallest molecular weight Ma of 2,000 to 80,000, a peak or shoulder C having the largest molecular weight Mc of 3×10 6 or larger satisfying the relationship of Mc/Ma≧150, and a peak or shoulder B having an intermediate molecular weight Mb between said Ma and Mc of 3×10 5 to 1×10 6 , wherein said peaks or shoulders A, B and C have heights Ha, Hb and Hc, respectively, which satisfy the proportion Ha:Hb:Hc of 1:0.2-1.0:0.1-0.6.
Claim 2
Dependent Claim
116 words
A binder resin for a toner comprising a polymer having at least three peaks or shoulders in its chromatogram obtained by gel permeation chromatography, wherein said at least three peaks or shoulders include a peak or shoulder A having the smallest molecular weight Ma of 2,000 to 80,000, a peak or shoulder C having the largest molecular weight Mc of 3×10 6 or larger satisfying the relationship of Mc/Ma≧150, and a peak or shoulder B having an intermediate molecular weight Mb between said Ma and Mc of 3×10 5 to 1×10 6 , wherein said peaks or shoulders A, B and C have heights Ha, Hb and Hc, respectively, which satisfy the proportion Ha:Hb:Hc of 1:0.2-1.0:0.1-0.6.
Claim 3
Dependent Claim
25 words
The binder resin according to claim 1, wherein said peak or shoulder B has a molecular weight Mb of 3×10 5 to 1×10 6 .
Claim 4
Dependent Claim
22 words
The binder resin according to claim 1, wherein said peak or shoulder C has a molecular weight of 3×10 6 or larger.
Claim 5
Dependent Claim
31 words
The binder resin according to claim 1, wherein said peaks or shoulders A, B and C have heights Ha, Hb and Hc, respectively, aatisfying the proportional relationship of Ha:Hb:Hc of 1:0.2-1.0:0.1-0.6.
Claim 6
Dependent Claim
16 words
The binder resin according to claim 1, wherein the molecular weight Ma is 2,000 to 40,000.
Claim 7
Dependent Claim
14 words
The binder resin according to claim 1, wherein said polymer is a vinyl polymer.
Claim 8
Dependent Claim
31 words
The binder resin according to claim 1, which comprises a mixture of a plurality of polymers, said plurality of polymers in combination giving said at least three peaks in the chromatogram.
Claim 9
Dependent Claim
18 words
The binder resin according to claim 1, wherein said polymer has a melt index of 0.25 to 5.
Claim 10
Dependent Claim
20 words
The binder resin according to claim 1, wherein said polymer has a softening point of from 100° to 150° C.
Claim 11
Dependent Claim
21 words
The binder resin according to claim 1, wherein said polymer has a glass transition point of from 40 to 80° C.
Claim 12
Dependent Claim
24 words
The binder resin according to claim 1, wherein the polymer is contained in the binder in an amount of 60% or more by weight.
Claim 13
Dependent Claim
124 words
A toner composition for development, comprising a colorant and a binder resin, said binder resin comprising a polymer having at least three peaks or shoulders in its chromatogram obtained by gel permeation chromatography, wherein said at least three peaks or shoulders include a peak or shoulder A having the smallest molecular weight Ma of 2,000 to 80,000, a peak or shoulder C having the largest molecular weight Mc of 3×10 6 or larger satisfying the relationship of Mc/Ma≧150, and a peak or shoulder B having an intermediate molecular weight Mb between said Ma and Mc of 3×10 5 to 1×10 6 wherein said peaks or shoulders A, B and C have heights Ha, Hb, and Hc, respectively, which satisfy the proportion Ha:Hb:Hc of 1:0.2-1.0:0.1-0.6.
Claim 14
Dependent Claim
124 words
A toner composition for development, comprising a colorant and a binder resin, said binder resin comprising a polymer having at least three peaks or shoulders in its chromatogram obtained by gel permeation chromatography, wherein said at least three peaks or shoulders include a peak or shoulder A having the smallest molecular weight Ma of 2,000 to 80,000, a peak or shoulder C having the largest molecular weight Mc of 3×10 6 or larger satisfying the relationship of Mc/Ma≧150, and a peak or shoulder B having an intermediate molecular weight Mb between said Ma and Mc of 3×10 5 to 1×10 6 wherein said peaks or shoulders A, B and C have heights Ha, Hb, and Hc, respectively, which satisfy the proportion Ha:Hb:Hc of 1:0.2-1.0:0.1-0.6.
Claim 15
Dependent Claim
25 words
The toner composition according to claim 12, wherein said peak or shoulder B has a molecular weight Mb of 3×10 5 to 1×10 6 .
Claim 16
Dependent Claim
22 words
The toner composition according to claim 12, wherein said peak or shoulder C has a molecular weight of 3×10 6 or larger.
Claim 17
Dependent Claim
35 words
The toner composition according to claim 12, wherein said peaks or shoulders A, B and C have heights Ha, Hb and Hc, respectively, satisfying the proportional relationships of Ha:Hb:Hc of 1:0.2 to 1.0:0.1 to 0.6.
Claim 18
Dependent Claim
16 words
The toner composition according to claim 12, wherein the molecular weight Ma is 2,000 to 40,000.
Claim 19
Dependent Claim
14 words
The toner composition according to claim 12, wherein said polymer is a vinyl polymer.
Claim 20
Dependent Claim
31 words
The toner composition according to claim 1, which comprises a mixture of a plurality of polymers, said plurality of polymers in combination giving said at least three peaks in the chromatogram.
Claim 21
Dependent Claim
18 words
The toner composition according to claim 12, wherein said polymer has a melt index of 0.25 to 5.
Claim 22
Dependent Claim
20 words
The toner composition according to claim 12, wherein said polymer has a softening point of from 100° to 150° C.
Claim 23
Dependent Claim
21 words
The toner composition according to claim 12, wherein said polymer has a glass transition point of from 40° to 80° C.
Claim 24
Dependent Claim
57 words
A process for producing a binder resin according to claim 1, comprising: subjecting a mixture of a vinyl monomer and a crosslinking monomer to suspension polymerization in an organic solvent capable of dissolving the polymerization product of the mixture in the presence of a polymerization initiator having a 10 hour-half life temperature of 100° C. or higher.
Claim 25
Dependent Claim
81 words
The process according to claim 22, wherein said vinyl monomer is selected from the group consisting of styrene, α-methylstyrene, p-chlorostyrene, acrylic acid, methyl acrylate, ethyl acrylate, butyl acrylate, dodecyl acrylate, octyl acrylate, phenyl acrylate, methacrylic acid, methyl methacrylate, ethyl methacrylate, butyl methacrylate, octyl methacrylate, acrylonitrile, acrylamide, maleic acid, monobutyl maleate, dibutyl maleate, monomethyl maleate, dimethyl maleate, vinyl chloride, vinyl acetate, vinyl benzoate, vinyl methyl ketone, vinyl ethyl ketone, vinyl methyl ether, vinyl ethyl ether, vinyl isobutyl ether, and a mixture thereof.
Claim 26
Dependent Claim
20 words
The process according to claim 22, wherein said crosslinking monomer is a compound having two or more polymerizable double bonds.
Claim 27
Dependent Claim
40 words
The process according to claim 23, wherein said crosslinking monomer is a compound selected from the group consisting of divinylbenzene, divinylnaphthalene, ethylene glycol diacrylate, ethylene glycol dimethacrylate, 1,3-butanediol dimethacrylate, divinylaniline, divinyl ether, divinyl sulfide, divinyl sulfone, and a mixture thereof.
Claim 28
Dependent Claim
26 words
The process according to claim 22, wherein said polymerization initiator is selected from the group consisting of 1,1-(t-butylperoxy)-3,3,5-trimethylcyclohexane, n-butyl-4,4-di-(t-butylperoxy)valerate, dicumyl peroxide, α,α'-bis(t-butylperoxydiisopropyl)benzene, t-butylperoxycumene, di-ti-butylperoxide, and diazoaminoazobenzene.
Claim 29
Dependent Claim
30 words
The process according to claim 22, wherein said solution polymerization is carried out at a temperature higher than the 10 hour-half life temperature of the polymerization initiator by 0°-40° C.
Claim 30
Dependent Claim
24 words
The toner according to claim 12, wherein the polymer is container in the binder resin in an amount of 60% or more by weight.
Claim 31
Dependent Claim
128 words
A process for producing a binder resin for toner, comprising uniformly mixing a polymer having a weight-average molecular weight of 1×10 3 to 8×10 4 , a polymer having a weight-average molecular weight of 3×10 5 to 10 6 and a polymer having a weight-average molecular weight of 3×10 6 or larger, to form a polymer mixture having at least three peaks or shoulders in its chromatogram obtained by gel permeation chromatography, wherein said at least three peaks or shoulders include a peak or shoulder A having the smallest molecular weight Ma of 2,000 to 80,000, a peak or shoulder C having the largest molecular weight Mc satisfying, the relationship of Mc/Ma≧150, and a peak or shoulder B having an intermediate molecular weight between said Ma and Mc.
Claim 32
Dependent Claim
128 words
A process for producing a binder resin for toner, comprising uniformly mixing a polymer having a weight-average molecular weight of 1×10 3 to 8×10 4 , a polymer having a weight-average molecular weight of 3×10 5 to 10 6 and a polymer having a weight-average molecular weight of 3×10 6 or larger, to form a polymer mixture having at least three peaks or shoulders in its chromatogram obtained by gel permeation chromatography, wherein said at least three peaks or shoulders include a peak or shoulder A having the smallest molecular weight Ma of 2,000 to 80,000, a peak or shoulder C having the largest molecular weight Mc satisfying, the relationship of Mc/Ma≧150, and a peak or shoulder B having an intermediate molecular weight between said Ma and Mc.
Claim 33
Dependent Claim
38 words
The process according to claim 29, wherein the mixing of the polymers are carried out by mixing the polymers each in solution, and the solvent is evaporated off from the resultant solution mixture to recover the polymer mixture.
Claim 34
Dependent Claim
77 words
The process according to claim 29, wherein the peak or shoulder A has a molecular weight Ma of 2,000 to 80,000, the peak or shoulder B has a molecular weight Mb of 3×10 5 to 1×10 6 and the peak or shoulder C has a molecular weight Mc of 3×10 6 or larger, wherein said peaks or shoulders A, B and C have heights Ha, Hb and Hc, respectively, which satisfy the proportion Ha:Hb:Hc of 1:0.2-1.0: 0.1-0.6.
Claim 35
Dependent Claim
106 words
A process for producing a toner, comprising: melt-kneading a colorant and a binder resin, said binder resin comprising a polymer having at least three peaks or shoulders in its chromatogram obtained by gel permeation chromatography, wherein said at least three peaks or shoulders include a peak or shoulder A having the smallest molecular weight Ma of 2,000 to 80,000, a peak or shoulder C having the largest molecular weight Mc satisfying the relationship of Mc/Ma≧150, and a peak or shoulder B having an intermediate molecular weight between said Ma and Mc, cooling the resultant mixture, and pulverizing and classifying the cooled mixture to obtain said toner.
Claim 36
Dependent Claim
106 words
A process for producing a toner, comprising: melt-kneading a colorant and a binder resin, said binder resin comprising a polymer having at least three peaks or shoulders in its chromatogram obtained by gel permeation chromatography, wherein said at least three peaks or shoulders include a peak or shoulder A having the smallest molecular weight Ma of 2,000 to 80,000, a peak or shoulder C having the largest molecular weight Mc satisfying the relationship of Mc/Ma≧150, and a peak or shoulder B having an intermediate molecular weight between said Ma and Mc, cooling the resultant mixture, and pulverizing and classifying the cooled mixture to obtain said toner.
Claim 37
Dependent Claim
77 words
The process according to claim 32, wherein the peak or shoulder A has a molecular weight Ma of 2,000 to 80,000, the peak or shoulder B has a molecular weight Mb of 3×10 5 to 1×10 6 and the peak or shoulder C has a molecular weight Mc of 3×10 6 or larger, wherein said peaks or shoulders A, B and C have heights Ha, Hb and Hc, respectively, which satisfy the proportion Ha:Hb:Hc of 1:0.2-1.0: 0.1-0.6.
Claim 38
Dependent Claim
24 words
The process according to claim 32, wherein the polymer is contained in the binder resin in an amount of 60% or more by weight.
References Cited (Backward Citations)
US4486524A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-12-01 | 1990-06-02 | 1990-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-01 | 1994-06-02 | 1994-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-01 | 1998-06-02 | 1998-12-02 | $7700.00 | Window Closed / Lapsed |