US5679490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toner for developing electrostatic images, and process for producing the same
Assignee: Canon Inc
•
Filing: 1996-05-30
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Granted: 1997-10-21
•
Expires: 2016-05-30
Abstract
Abstract A toner which comprises toner particles containing a binder resin, a colorant, a polar resin and a release agent, wherein the binder resin is a styrene polymer, a styrene copolymer, or a mixture of these, and has a weight average molecular weight Mw 1 of from 10,000 to 1,000,000, the polar resin is a polyester resin containing a tetrahydrofuran-soluble matter of which weight average molecular weight Mw 2 is from 7,000 to 50,000 and an ethyl alcohol-soluble matter of which weight average molecular weight Mw 3 is from 1,000 to 7,000, where Mw 2 /Mw 3 is from 1.2 to 10.
Inventors
- 👤 Shinya Yachi
- 👤 Koji Inaba
- 👤 Kazunori Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:01
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08702; G03G9/08706; G03G9/0802; G03G9/0804; G03G9/0806; G03G9/08708; G03G9/08711; G03G9/08742; G03G9/08755; G03G9/08784; G03G9/08795
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
110 words
A toner for developing an electrostatic image, comprising toner particles, wherein; said toner particles contain a binder resin, a colorant, a polar resin and a release agent; said binder resin is a styrene polymer, a styrene copolymer, or a mixture of these, and has a weight average molecular weight Mw 1 of from 10,000 to 1,000,000; said polar resin is a polyester resin; said polyester resin containing a tetrahydrofuran-soluble matter having a weight average molecular weight Mw 2 of from 7,000 to 50,000 and an ethyl alcohol-soluble matter having a weight average molecular weight Mw 3 of from 1,000 to 7,000; Mw 2 /Mw 3 being from 1.2 to 10.
Claim 2
Dependent Claim
110 words
A toner for developing an electrostatic image, comprising toner particles, wherein; said toner particles contain a binder resin, a colorant, a polar resin and a release agent; said binder resin is a styrene polymer, a styrene copolymer, or a mixture of these, and has a weight average molecular weight Mw 1 of from 10,000 to 1,000,000; said polar resin is a polyester resin; said polyester resin containing a tetrahydrofuran-soluble matter having a weight average molecular weight Mw 2 of from 7,000 to 50,000 and an ethyl alcohol-soluble matter having a weight average molecular weight Mw 3 of from 1,000 to 7,000; Mw 2 /Mw 3 being from 1.2 to 10.
Claim 3
Dependent Claim
54 words
The toner according to claim 1, wherein said polyester resin is contained in an amount of from 2 parts by weight to 30 parts by weight based on 100 parts by weight of the binder resin, and contains the ethyl alcohol-soluble matter in an amount of from 0.1% by weight to 20% by weight.
Claim 4
Dependent Claim
24 words
The toner according to claim 1 or 2, wherein said polyester resin has an acid value of 3 mg KOH/g to 35 mg KOH/g.
Claim 5
Dependent Claim
30 words
The toner according to claim 2, wherein said polyester resin is a resin formed from a material composition containing at least an aromatic dicarboxylic acid and a bisphenol type diol.
Claim 6
Dependent Claim
19 words
The toner according to claim 1, wherein said polyester resin stands localized on the surfaces of said toner particles.
Claim 7
Dependent Claim
17 words
The toner according to claim 5, wherein said toner particles are surface-treated with a water-soluble polymerization initiator.
Claim 8
Dependent Claim
43 words
The toner according to claim 1, wherein said binder resin has a weight average molecular weight Mw 1 of from 50,000 to 900,000, said polyester resin has a Mw 2 of from 8,000 to 40,000 and Mw 3 of from 1,000 to 5,000.
Claim 9
Dependent Claim
14 words
The toner according to claim 1, wherein said binder resin is a styrene-acrylate copolymer.
Claim 10
Dependent Claim
15 words
The toner according to claim 1, wherein said binder resin is a cross-linked styrene-acrylate copolymer.
Claim 11
Dependent Claim
19 words
The toner according to claim 1, wherein said binder resin is a cross-linked styrene-acrylate copolymer having a toluene-insoluble matter.
Claim 12
Dependent Claim
14 words
The toner according to claim 1, wherein said binder resin is a styrene-methacrylate copolymer.
Claim 13
Dependent Claim
15 words
The toner according to claim 1, wherein said binder resin is a cross-linked styrene-methacrylate copolymer.
Claim 14
Dependent Claim
19 words
The toner according to claim 1, wherein said binder resin is a cross-linked styrene-methacrylate copolymer having a toluene-insoluble matter.
Claim 15
Dependent Claim
36 words
The toner according to claim 1, wherein said release agent is contained in an amount of from 5 parts by weight to 40 parts by weight based on 100 parts by weight of the binder resin.
Claim 16
Dependent Claim
36 words
The toner according to claim 1, wherein said release agent is contained in an amount of from 12 parts by weight to 35 parts by weight based on 100 parts by weight of the binder resin.
Claim 17
Dependent Claim
28 words
The toner according to claim 1, wherein said release agent is contained in said toner particles in an amount of from 10% by weight to 30% by weight.
Claim 18
Dependent Claim
20 words
The toner according to claim 1, wherein said toner particles have a shape factor SF-1 of from 100 to 150.
Claim 19
Dependent Claim
20 words
The toner according to claim 1, wherein said toner particles have a shape factor SF-1 of from 100 to 125.
Claim 20
Dependent Claim
33 words
The toner according to claim 1, wherein said toner particles have a weight average particle diameter of from 3 μm to 8 μm, and a coefficient of number variation of 35% or less.
Claim 21
Dependent Claim
33 words
The toner according to claim 1, wherein said toner particles are polymerization toner particles directly formed by polymerizing, in an aqueous medium, polymerizable monomers present in the granules of a polymerizable monomer composition.
Claim 22
Dependent Claim
21 words
The toner according to claim 20, wherein said toner particles are surface-treated with a water-soluble polymerization initiator in the aqueous medium.
Claim 23
Dependent Claim
14 words
The toner according to claim 1, wherein said release agent is a solid wax.
Claim 24
Dependent Claim
71 words
The toner according to claim 22, wherein said release agent has a weight average molecular weight of from 300 to 1,500, has a ratio of weight average molecular weight Mw to number average molecular weight Mn, Mw/Mn, of 1.5 or less, has a main endothermic peak in the DSC endothermic curve at a temperature of from 55° C. to 120° C., with a tangent takeoff temperature at 40° C. or above.
Claim 25
Dependent Claim
45 words
The toner according to claim 23, wherein said release agent has a main endothermic peak in the DSC endothermic curve at a temperature of from 60° C. to 90° C. and the peak has a half width of the peak of 10° C. or less.
Claim 26
Dependent Claim
24 words
The toner according to claim 24, wherein said release agent has the main endothermic peak having the half width of 5° C. or less.
Claim 27
Dependent Claim
15 words
The toner according to claim 23, wherein said release agent is a solid ester wax.
Claim 28
Dependent Claim
15 words
The toner according to claim 1, wherein said toner particles are non-magnetic cyan toner particles.
Claim 29
Dependent Claim
16 words
The toner according to claim 27, wherein said toner particles contain a negative charge control agent.
Claim 30
Dependent Claim
15 words
The toner according to claim 1, wherein said toner particles are non-magnetic magenta toner particles.
Claim 31
Dependent Claim
16 words
The toner according to claim 29, wherein said toner particles contain a negative charge control agent.
Claim 32
Dependent Claim
15 words
The toner according to claim 1, wherein said toner particles are non-magnetic yellow toner particles.
Claim 33
Dependent Claim
16 words
The toner according to claim 31, wherein said toner particles contain a negative charge control agent.
Claim 34
Dependent Claim
41 words
The toner according to claim 1, wherein said polyester resin has a ratio of weight average molecular weight Mw 2 to number average molecular weight Mn 2 of said tetrahydrofuran-soluble matter, Mw 2 /Mn 2 , of from 1.2 to 3.5.
Claim 35
Dependent Claim
22 words
The toner according to claim 33, wherein said polyester resin has the ratio Mw 2 /Mn 2 of from 1.5 to 3.0.
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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) | 2000-10-20 | 2001-04-21 | 2001-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-10-20 | 2005-04-21 | 2005-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-10-20 | 2009-04-21 | 2009-10-21 | $7700.00 | Window Closed / Lapsed |