US5635325A
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US
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Toner for developing electrostatic images and image forming method
Assignee: Canon Inc
•
Filing: 1995-05-26
•
Granted: 1997-06-03
•
Expires: 2015-05-26
Abstract
Abstract A toner for developing electrostatic images includes: at least a binder resin, a colorant and an ester wax. The ester wax is contained in 3-40 wt. parts per 100 wt. parts of the binder resin. The ester wax includes ester compounds represented by a formula ofR1-COO-R2,wherein R1 an R2 independently denote a hydrocarbon group of 15-45 carbon atoms. The ester wax contains 50-95 wt. % thereof of ester compounds having an identical number of total carbon atoms. The toner is especially characterized by low-temperature fixability, wide non-offset temperature range, good color mixing characteristic and transparency.
Inventors
- 👤 Kohji Inaba
- 👤 Tatsuya Nakamura
- 👤 Tatsuhiko Chiba
- 👤 Takao Ishiyama
- 👤 Kengo Hayase
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:37
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08775; G03G9/08782; G03G9/097; G03G9/09733; G03G9/08784; G03G9/08797; G03G9/09
Claims Analysis
Total Claims: 69
Claim 1
Independent Claim
84 words
A toner for developing electrostatic images, comprising: at least a binder resin, a colorant and an ester wax; wherein said ester wax is contained in 3-40 wt. parts per 100 wt. parts of the binder resin, said ester wax comprises ester compounds represented by a formula of R.sub.1 --COO--R.sub.2, wherein R 1 and R 2 independently denote a hydrocarbon group of 15-45 carbon atoms, and said ester wax contains 50-95 wt. % thereof of ester compounds having an identical number of total carbon atoms.
Claim 2
Dependent Claim
84 words
A toner for developing electrostatic images, comprising: at least a binder resin, a colorant and an ester wax; wherein said ester wax is contained in 3-40 wt. parts per 100 wt. parts of the binder resin, said ester wax comprises ester compounds represented by a formula of R.sub.1 --COO--R.sub.2, wherein R 1 and R 2 independently denote a hydrocarbon group of 15-45 carbon atoms, and said ester wax contains 50-95 wt. % thereof of ester compounds having an identical number of total carbon atoms.
Claim 3
Dependent Claim
14 words
The toner according to claim 1, wherein R 1 denotes a saturated hydrocarbon group.
Claim 4
Dependent Claim
13 words
The toner according to claim 2, wherein R 1 denotes an alkyl group.
Claim 5
Dependent Claim
14 words
The toner according to claim 1, wherein R 2 denotes a saturated hydrocarbon group.
Claim 6
Dependent Claim
13 words
The toner according to claim 1, wherein R 2 denotes an alkyl group.
Claim 7
Dependent Claim
17 words
The toner according to claim 1, wherein R 1 and R 2 respectively denote a hydrocarbon group.
Claim 8
Dependent Claim
17 words
The toner according to claim 6, wherein R 1 and R 2 respectively denote an alkyl group.
Claim 9
Dependent Claim
30 words
The toner according to claim 1, wherein R 1 denotes a linear alkyl group having 15-45 carbon atoms and R 2 denotes a linear alkyl group having 15-45 carbon atoms.
Claim 10
Dependent Claim
17 words
The toner according to claim 1, wherein the ester wax has a melting point of 40°-90° C.
Claim 11
Dependent Claim
17 words
The toner according to claim 9, wherein the ester wax has a melting point of 55°-85° C.
Claim 12
Dependent Claim
15 words
The toner according to claim 1, wherein the ester wax has a hardness of 0.5-5.0.
Claim 13
Dependent Claim
24 words
The toner according to claim 1, wherein the ester wax is contained in 5-35 wt. parts per 100 wt. parts of the binder resin.
Claim 14
Dependent Claim
26 words
The toner according to claim 1, wherein the ester wax has a weight-average molecular weight (Mw) of 200-2000 and a number-average molecular weight (Mn) of 150-2000.
Claim 15
Dependent Claim
26 words
The toner according to claim 1, wherein the ester wax contains 55-95 wt. % of the ester compounds having an identical number of total carbon atoms.
Claim 16
Dependent Claim
26 words
The toner according to claim 14, wherein the ester wax contains 60-95 wt. % of the ester compounds having an identical number of total carbon atoms.
Claim 17
Dependent Claim
33 words
The toner according to claim 1, wherein the ester wax contains totally 80-95 wt. % thereof of ester compounds having total carbon atoms in a range of number of said identical number ±2.
Claim 18
Dependent Claim
33 words
The toner according to claim 16, wherein the ester wax contains totally 90-95 wt. % thereof of ester compounds having total carbon atoms in a range of number of said identical number ±2.
Claim 19
Dependent Claim
51 words
The toner according to claim 1, wherein the ester wax contains totally 50-90 wt. % thereof of ester compounds represented by R 1 '--COO--R 2 ' (wherein R 1 ' and R 2 ' independently denote a linear long-chain alkyl group having 15-28 carbon atoms) and having totally 44 carbon atoms.
Claim 20
Dependent Claim
41 words
The toner according to claim 1, wherein said binder resin contains a tetrahydrofuran (THF)-soluble content which has a number-average molecular weight (Mn) of 5×10 3 -10 6 and a ratio (Mw/Mn) of weight-average molecular weight (Mw)/number-average molecular weight (Mn) of 2-100.
Claim 21
Dependent Claim
16 words
The toner according to claim 1, wherein the ester wax is enclosed within the binder resin.
Claim 22
Dependent Claim
13 words
The toner according to claim 1, wherein the colorant comprises a cyan colorant.
Claim 23
Dependent Claim
13 words
The toner according to claim 1, wherein the colorant comprises a magenta colorant.
Claim 24
Dependent Claim
13 words
The toner according to claim 1, wherein the colorant comprises a yellow colorant.
Claim 25
Dependent Claim
46 words
The toner according to claim 1, which is in the form of toner particles which have been prepared directly from a monomer composition comprising at least a polymerizable monomer providing the binder resin, the colorant, the ester wax and a polymerization initiator in an aqueous medium.
Claim 26
Dependent Claim
15 words
The toner according to claim 24, wherein the toner particles comprise cyan color toner particles.
Claim 27
Dependent Claim
15 words
The toner according to claim 24, wherein the toner particles comprise magenta color toner particles.
Claim 28
Dependent Claim
15 words
The toner according to claim 24, wherein the toner particles comprise yellow color toner particles.
Claim 29
Dependent Claim
26 words
The toner according to claim 24, wherein the ester wax contains 55-95 wt. % of the ester compounds having an identical number of total carbon atoms.
Claim 30
Dependent Claim
26 words
The toner according to claim 28, wherein the ester wax contains 60-95 wt. % of the ester compounds having an identical number of total carbon atoms.
Claim 31
Dependent Claim
58 words
The toner according to claim 28 or 29, wherein the ester wax contains 50-95 wt. % thereof in total of ester compounds, each having totally 44 carbon atoms and represented by the formula of R 1 '--COO--R 2 ' wherein R 1 ' and R 2 ' independently denote a linear long-chain alkyl group having 15-28 carbon atoms.
Claim 32
Dependent Claim
14 words
The toner according to claim 1, which has a shape factor SF-1 of 100-160.
Claim 33
Dependent Claim
14 words
The toner according to claim 31, which has a shape factor SF-1 of 100-150.
Claim 34
Dependent Claim
26 words
The toner according to claim 1, which has a weight-average particle size of 3-8 μm, and a number-basis particle size variation coefficient of at most 35%.
Claim 35
Dependent Claim
147 words
An image forming method, comprising: forming an electrostatic image on an electrostatic image-bearing member, developing the electrostatic image with a toner to form a toner image on the electrostatic image-bearing member, transferring the toner image from the electrostatic image-bearing member to a transfer-receiving material directly or via an intermediate transfer member, and fixing the toner image onto the transfer-receiving material under application of heat and pressure, wherein said toner comprises at least a binder resin, a colorant and an ester wax; wherein said ester wax is contained in 3-40 wt. parts per 100 wt. parts of the binder resin, said ester wax comprises ester compounds represented by a formula of R.sub.1 --COO--R.sub.2, wherein R 1 and R 2 independently denote a hydrocarbon group of 15-45 carbon atoms, and said ester wax contains 50-95 wt. % thereof of ester compounds having an identical number of total carbon atoms.
Claim 36
Dependent Claim
147 words
An image forming method, comprising: forming an electrostatic image on an electrostatic image-bearing member, developing the electrostatic image with a toner to form a toner image on the electrostatic image-bearing member, transferring the toner image from the electrostatic image-bearing member to a transfer-receiving material directly or via an intermediate transfer member, and fixing the toner image onto the transfer-receiving material under application of heat and pressure, wherein said toner comprises at least a binder resin, a colorant and an ester wax; wherein said ester wax is contained in 3-40 wt. parts per 100 wt. parts of the binder resin, said ester wax comprises ester compounds represented by a formula of R.sub.1 --COO--R.sub.2, wherein R 1 and R 2 independently denote a hydrocarbon group of 15-45 carbon atoms, and said ester wax contains 50-95 wt. % thereof of ester compounds having an identical number of total carbon atoms.
Claim 37
Dependent Claim
31 words
The method according to claim 34, wherein said transfer-receiving material is caused to carry toner images at least two colors selected from the group consisting of cyan, magenta, yellow and black.
Claim 38
Dependent Claim
16 words
The method according to claim 34 or 35, wherein R 1 denotes a saturated hydrocarbon group.
Claim 39
Dependent Claim
13 words
The method according to claim 36, wherein R 1 denotes an alkyl group.
Claim 40
Dependent Claim
16 words
The method according to claim 34 or 35, wherein R 2 denotes a saturated hydrocarbon group.
Claim 41
Dependent Claim
13 words
The method according to claim 38, wherein R 2 denotes an alkyl group.
Claim 42
Dependent Claim
19 words
The method according to claim 34 or 35, wherein R 1 and R 2 respectively denote a hydrocarbon group.
Claim 43
Dependent Claim
17 words
The method according to claim 40, wherein R 1 and R 2 respectively denote an alkyl group.
Claim 44
Dependent Claim
32 words
The method according to claim 34 or 35, wherein R 1 denotes a linear alkyl group having 15-45 carbon atoms and R 2 denotes a linear alkyl group having 15-45 carbon atoms.
Claim 45
Dependent Claim
19 words
The method according to claim 34 or 35, wherein the ester wax has a melting point of 40°-90° C.
Claim 46
Dependent Claim
17 words
The method according to claim 43, wherein the ester wax has a melting point of 55°-85° C.
Claim 47
Dependent Claim
17 words
The method according to claim 34 or 35, wherein the ester wax has a hardness of 0.5-5.0.
Claim 48
Dependent Claim
26 words
The method according to claim 34 or 35, wherein the ester wax is contained in 5-35 wt. parts per 100 wt. parts of the binder resin.
Claim 49
Dependent Claim
28 words
The method according to claim 34 or 35, wherein the ester wax has a weight-average molecular weight (Mw) of 200-2000 and a number-average molecular weight (Mn) of 150-2000.
Claim 50
Dependent Claim
28 words
The method according to claim 34 or 35, wherein the ester wax contains 55-95 wt. % of the ester compounds having an identical number of total carbon atoms.
Claim 51
Dependent Claim
26 words
The method according to claim 48, wherein the ester wax contains 60-95 wt. % of the ester compounds having an identical number of total carbon atoms.
Claim 52
Dependent Claim
35 words
The method according to claim 34 or 35, wherein the ester wax contains totally 80-95 wt. % thereof of ester compounds having total carbon atoms in a range of number of said identical number ±2.
Claim 53
Dependent Claim
33 words
The method according to claim 50, wherein the ester wax contains totally 90-95 wt. % thereof of ester compounds having total carbon atoms in a range of number of said identical number ±2.
Claim 54
Dependent Claim
53 words
The method according to claim 34 or 35, wherein the ester wax contains totally 50-90 wt. % thereof of ester compounds represented by R 1 '--COO--R 2 ' (wherein R 1 ' and R 2 ' independently denote a linear long-chain alkyl group having 15-28 carbon atoms) and having totally 44 carbon atoms.
Claim 55
Dependent Claim
43 words
The method according to claim 34 or 35, wherein said binder resin contains a tetrahydrofuran (THF)-soluble content which has a number-average molecular weight (Mn) of 5×10 3 -10 6 and a ratio (Mw/Mn) of weight-average molecular weight (Mw)/number-average molecular weight (Mn) of 2-100.
Claim 56
Dependent Claim
18 words
The method according to claim 34 or 35, wherein the ester wax is enclosed within the binder resin.
Claim 57
Dependent Claim
15 words
The method according to claim 34 or 35, wherein the colorant comprises a cyan colorant.
Claim 58
Dependent Claim
15 words
The method according to claim 34 or 35, wherein the colorant comprises a magenta colorant.
Claim 59
Dependent Claim
15 words
The method according to claim 34 or 35, wherein the colorant comprises a yellow colorant.
Claim 60
Dependent Claim
48 words
The method according to claim 34 or 35, which is in the form of toner particles which have been prepared directly from a monomer composition comprising at least a polymerizable monomer providing the binder resin, the colorant, the ester wax and a polymerization initiator in an aqueous medium.
Claim 61
Dependent Claim
15 words
The method according to claim 58, wherein the toner particles comprise cyan color toner particles.
Claim 62
Dependent Claim
15 words
The method according to claim 58, wherein the toner particles comprise magenta color toner particles.
Claim 63
Dependent Claim
15 words
The method according to claim 58, wherein the toner particles comprise yellow color toner particles.
Claim 64
Dependent Claim
26 words
The method according to claim 58, wherein the ester wax contains 55-95 wt. % of the ester compounds having an identical number of total carbon atoms.
Claim 65
Dependent Claim
26 words
The method according to claim 62, wherein the ester wax contains 60-95 wt. % of the ester compounds having an identical number of total carbon atoms.
Claim 66
Dependent Claim
56 words
The method according to claim 62, wherein the ester wax contains 50-95 wt. % thereof in total of ester compounds, each having totally 44 carbon atoms and represented by the formula of R 1 '--COO--R 2 ' wherein R 1 ' and R 2 ' independently denote a linear long-chain alkyl group having 15-28 carbon atoms.
Claim 67
Dependent Claim
16 words
The method according to claim 34 or 35, which has a shape factor SF-1 of 100-160.
Claim 68
Dependent Claim
14 words
The method according to claim 65, which has a shape factor SF-1 of 100-150.
Claim 69
Dependent Claim
28 words
The method according to claim 34 or 35, which has a weight-average particle size of 3-8 μm, and a number-basis particle size variation coefficient of at most 35%.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-06-02 | 2000-12-02 | 2001-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-06-02 | 2004-12-02 | 2005-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-06-02 | 2008-12-02 | 2009-06-03 | $7700.00 | Window Closed / Lapsed |