Patent US5268248A successfully refreshed from Google Patents.
US5268248A
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US
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Toner for developing electrostatic image and process for production thereof
Assignee: Canon Inc
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Filing: 1991-11-26
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Granted: 1993-12-07
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Expires: 2011-11-26
Abstract
Abstract A toner for developing an electrostatic image is provided as a pulverized mixture including a binder resin and a colorant. The binder resin is characterized by a molecular weight distribution on a GPC chromatogram of its tetrahydrofuran (THF)-soluble resin content including below 15% of a resin component in a molecular weight region of at most 5000 and at least 5 wt. % of a resin component in a molecular weight region of at least 5×10 6 and showing a main peak in a molecular weight region of 5000 to 5×10 6 . The THF-soluble resin component in the molecular weight region of at least 5×10 6 is extremely enriched during a melt-kneading step during the toner production, so as to effectively prevent toner flowout from a member for cleaning a fixing roller.
Inventors
- 👤 Hirohide Tanikawa
- 👤 Masaki Uchiyama
- 👤 Yoshinobu Joh
- 👤 Yasutaka Akashi
- 👤 Masaaki Taya
- 👤 Makoto Unno
- 👤 Kazuyoshi Hagiwara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:22
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08702; G03G9/08706; G03G9/08708; G03G9/08784; G03G9/08793; G03G9/08795
Claims Analysis
Total Claims: 42
Claim 1
Independent Claim
120 words
A toner for developing an electrostatic image, comprising: a binder resin and a colorant, wherein the binder resin shows a molecular weight distribution on a GPC chromatogram of its tetrahydrofuran (THF)-soluble resin content including below 15% of a resin component in a molecular weight region of at most 5,000 and at least 5% of a resin component in a molecular weight region of at least 5×10 6 and showing a main peak in a molecular weight region of 5,000 to 10 5 , wherein the binder resin has an acid value attributable to acid anhydride groups of at most 10 mgKOH/g and (ii) a weight average molecular weight of at least 5'10 6 as calculated based on the GPC chromatogram.
Claim 2
Dependent Claim
120 words
A toner for developing an electrostatic image, comprising: a binder resin and a colorant, wherein the binder resin shows a molecular weight distribution on a GPC chromatogram of its tetrahydrofuran (THF)-soluble resin content including below 15% of a resin component in a molecular weight region of at most 5,000 and at least 5% of a resin component in a molecular weight region of at least 5×10 6 and showing a main peak in a molecular weight region of 5,000 to 10 5 , wherein the binder resin has an acid value attributable to acid anhydride groups of at most 10 mgKOH/g and (ii) a weight average molecular weight of at least 5'10 6 as calculated based on the GPC chromatogram.
Claim 3
Dependent Claim
21 words
The toner according to claim 1, wherein said binder resin is a vinyl polymer, a vinyl copolymer or a mixture thereof.
Claim 4
Dependent Claim
15 words
The toner according to claim 1, wherein said binder resin comprises a vinyl copolymer composition.
Claim 5
Dependent Claim
23 words
The toner according to claim 1, wherein said binder resin comprises a mixture of a crosslinked vinyl copolymer and a non-crosslinked vinyl copolymer.
Claim 6
Dependent Claim
23 words
The toner according to claim 1, wherein said binder resin comprises a mixture of a crosslinked styrene copolymer and a non-crosslinked styrene copolymer.
Claim 7
Dependent Claim
42 words
The toner according to claim 1, wherein said binder resin contains a crosslinkage formed by a crosslinking agent having at least two vinyl groups, and an electrostatic crosslinkage formed by a carboxylic group and a metal ion of two or more valences.
Claim 8
Dependent Claim
32 words
The toner according to claim 1, wherein said binder resin shows a molecular weight distribution including 7-30% of a resin component in the molecular weight region of at least 5×10 6 .
Claim 9
Dependent Claim
32 words
The toner according to claim 1, wherein said binder resin shows a molecular weight distribution including 8-25% of a resin component in the molecular weight region of at least 5×10 6 .
Claim 10
Dependent Claim
32 words
The toner according to claim 1, wherein said binder resin shows a molecular weight distribution including 10-30% of a resin component in the molecular weight of 10 5 to 5×10 6 .
Claim 11
Dependent Claim
64 words
The toner according to claim 1, wherein said binder resin shows a molecular weight distribution including 2-14% of a resin component in the molecular weight region of at most 5000, 10-30% of a resin component in the molecular weight region of 10 5 to 5×10 6 , and 3-20% of a resin component in the molecular weight region of at least 5×10 6 .
Claim 12
Dependent Claim
26 words
The toner according to claim 1, wherein said binder resin has a carboxyl group and contains an organic metal compound electrostatically linkable with the carboxylic group.
Claim 13
Dependent Claim
31 words
The toner according to claim 1, wherein said binder resin shows a molecular weight distribution showing a main peak in a molecular weight region of 10 4 to 5×10 4 .
Claim 14
Dependent Claim
34 words
The toner according to claim 1, wherein said binder resin shows a molecular weight distribution including at least 40% of a resin component in a molecular weight region of 5000 to 10 5 .
Claim 15
Dependent Claim
65 words
The toner according to claim 1, wherein said binder resin shows a molecular weight distribution including 2-14% of a resin component in the molecular weight region of at most 5000, at least 45% of a resin component in the molecular weight region of 5000 to 10 5 , and 7-30% of a resin component in the molecular weight region of at least 5×10 6 .
Claim 16
Dependent Claim
18 words
The toner according to claim 1, wherein said binder resin has a JIS acid value of 2-100 kgKOH/g.
Claim 17
Dependent Claim
18 words
The toner according to claim 1, wherein said binder resin has a JIS acid value of 5-70 mgKOH/g.
Claim 18
Dependent Claim
23 words
The toner according to claim 1, wherein said binder resin has an acid value attributable to acid anhydride group of below 6 mgKOH/g.
Claim 19
Dependent Claim
17 words
The toner according to claim 1, wherein said binder resin contains a styrene-maleic acid half ester copolymer.
Claim 20
Dependent Claim
16 words
The toner according to claim 1, wherein said binder resin contains a styrene-maleic acid ester copolymer.
Claim 21
Dependent Claim
15 words
The toner according to claim 1, wherein said binder resin contains a styrene-maleic anhydride copolymer.
Claim 22
Dependent Claim
28 words
The toner according to claim 1, wherein said binder resin contains a non-crosslinked styrene-maleic acid half ester copolymer and a styrene-maleic acid half ester copolymer crosslinked with divinylbenzene.
Claim 23
Dependent Claim
13 words
The toner according to claim 1, wherein said colorant comprises a magnetic material.
Claim 24
Dependent Claim
12 words
The toner according to claim 1, wherein said colorant comprises carbon black.
Claim 25
Dependent Claim
33 words
The toner according to claim 1, wherein said binder resin has a carboxyl group or acid anhydride group and contains an organic metal compound reactive with the carboxyl group or acid anhydride group.
Claim 26
Dependent Claim
103 words
The toner according to claim 24, wherein said organic metal compound is an azo metal complex represented by the following formula: ##STR7## wherein M is a coordination center metal selected from the group consisting of Sc, Ti, V, Cr, Co, Ni and Fe; Ar is a substituted or unsubstituted aryl group; X, X', Y and Y' are independently a member selected from the group consisting of --O--, --CO--, --NH--, or --NR-- Wherein R is an alkyl having 1-4 carbon atoms; and A⊕ is a cation selected from the group consisting of hydrogen ion, sodium ion, potassium ion, ammonium ion and aliphatic ammonium ion.
Claim 27
Dependent Claim
84 words
The toner according to claim 24, wherein said organic metal compound is an organic acid metal complex represented by the following formula: ##STR8## wherein M is a coordination center metal selected from the group consisting of Cr, Co, Ni and Fe; A is a substituted or unsubstituted aryl group; Y⊕ is a cation selected from the group consisting of hydrogen ion, sodium ion, potassium ion, ammonium ion and aliphatic ammonium ion, and Z is a member selected from the group consisting --O-- or --CO.O--.
Claim 28
Dependent Claim
13 words
The toner according to claim 1, wherein a waxy substance is further contained.
Claim 29
Dependent Claim
33 words
The toner according to claim 1, wherein said binder resin shows a molecular weight distribution on the GPC chromatogram showing a maximum in the molecular weight region of at least 5×10 6 .
Claim 30
Dependent Claim
27 words
The toner according to claim 1, wherein the THF-soluble resin content of the binder resin shows a weight-average molecular weight (Mw) of 6×10 6 -2×10 7 .
Claim 31
Dependent Claim
27 words
The toner according to claim 1, wherein the THF-soluble resin content of the binder resin shows a number-average molecular weight (Mn) of at most 4×10 4 .
Claim 32
Dependent Claim
24 words
The toner according to claim 1, wherein the THF-soluble resin content of the binder resin shows an Mn of at most 3×10 4 .
Claim 33
Dependent Claim
24 words
The toner according to claim 1, wherein the THF-soluble resin content of the binder resin shows an Mn of at most 2.5×10 4 .
Claim 34
Dependent Claim
23 words
The toner according to claim 1, wherein the THF-soluble resin content of the binder resin shows an Mw/Mn ratio of at least 125.
Claim 35
Dependent Claim
23 words
The toner according to claim 1, wherein the THF-soluble resin content of the binder resin shows an Mw/Mn ratio of at least 170.
Claim 36
Dependent Claim
27 words
The toner according to claim 1, wherein the THF-soluble resin content of the binder resin shows a Z-average molecular weight (Mz) of at least 2×10 7 .
Claim 37
Dependent Claim
23 words
The toner according to claim 1, wherein the THF-soluble resin content of the binder resin shows an Mz/Mw ratio of at most 40.
Claim 38
Dependent Claim
21 words
The toner according to claim 1, wherein the THF-soluble resin content of the binder resin shows an Mz/Mw ratio of 5-30.
Claim 39
Dependent Claim
75 words
The toner according to claim 1, wherein the binder resin contains a THF-insoluble resin component in a proportion of at most 10 wt. % measured as a residue on a filter having a pore size of 0.45-0.5 micron when the binder resin is mixed with THF to provide a concentration of 5 mg/ml and the mixture is left standing for about 30 hours at room temperature and then subjected to filtration by using the filter.
Claim 40
Dependent Claim
26 words
The toner according to claim 38, wherein the THF-insoluble resin component is contained in a proportion of at most 10 wt. % in the binder resin.
Claim 41
Dependent Claim
18 words
The toner according to claim 38, wherein the THF-insoluble resin component is substantially zero in the binder resin.
Claim 42
Dependent Claim
61 words
The toner according to claim 1 wherein the binder resin shows a molecular weight distribution on a GPC chromatogram of its tetrahydrofuran (THF)-soluble resin content including 2 to 15% of the resin component in a molecular weight region of at most 5,000 and 5 to 30% of the resin component in a molecular weight region of at least 5×10 6 .
References Cited (Backward Citations)
US2297691A
Cited
US4071361A
Cited
US3666363A
Cited
US4158634A
Cited
JPS5616144A
Cited
JPS56158340A
Cited
JPS5786558A
Cited
US4565766A
Cited
US4565763A
Cited
JPS60166958A
Cited
US4966829A
Cited
JPS63223662A
Cited
JPH01172844A
Cited
JPH01172843A
Cited
EP0331393A2
Cited
US4952476A
Cited
EP0393592A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-12-06 | 1997-06-07 | 1997-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-12-06 | 2001-06-07 | 2001-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-12-06 | 2005-06-07 | 2005-12-07 | $7700.00 | Window Closed / Lapsed |