US5712072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toner for developing electrostatic image
Assignee: Canon Inc
•
Filing: 1996-02-22
•
Granted: 1998-01-27
•
Expires: 2016-02-22
Abstract
Abstract The present invention relates to a toner for developing an electrostatic image, comprising toner particles containing a binding resin composed of a styrene homopolymer or copolymer, a coloring agent, a polar resin, and a specified solid ester wax.
Inventors
- 👤 Kohji Inaba
- 👤 Tatsuya Nakamura
- 👤 Tatsuhiko Chiba
- 👤 Kengo Hayase
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:36
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08742; G03G9/0802; G03G9/0804; G03G9/0806; G03G9/08775; G03G9/08782; G03G9/093; G03G9/09307; G03G9/09314; G03G9/09321; G03G9/0935; G03G9/09378; G03G9/09392
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
159 words
A toner for developing an electrostatic image, comprising: toner particles containing a binding resin composed of a styrene homopolymer or copolymer, a coloring agent, a polar resin, and a solid ester wax represented by the following general formula (A) or (B): ##STR11## wherein R 1 and R 3 represent organic groups each having 6 to 32 carbon atoms, R 1 and R 3 may be the same or different, and R 2 represents an alkylene group having 4 to 20 carbon atoms: ##STR12## wherein R 4 and R 6 represent organic groups each having 6 to 32 carbon atoms, R 4 and R 6 may be the same or different, and R 5 represents an organic group selected from the group consisting of the following groups (1), (2), and (3): --CH.sub.2 CH.sub.2 OC.sub.6 H.sub.4 OCH.sub.2 CH.sub.2 -- (1); ##STR13## wherein n represents an integer not less than 1; --(CH.sub.2).sub.m --(3) wherein m represents an integer of 4 to 20.
Claim 2
Dependent Claim
159 words
A toner for developing an electrostatic image, comprising: toner particles containing a binding resin composed of a styrene homopolymer or copolymer, a coloring agent, a polar resin, and a solid ester wax represented by the following general formula (A) or (B): ##STR11## wherein R 1 and R 3 represent organic groups each having 6 to 32 carbon atoms, R 1 and R 3 may be the same or different, and R 2 represents an alkylene group having 4 to 20 carbon atoms: ##STR12## wherein R 4 and R 6 represent organic groups each having 6 to 32 carbon atoms, R 4 and R 6 may be the same or different, and R 5 represents an organic group selected from the group consisting of the following groups (1), (2), and (3): --CH.sub.2 CH.sub.2 OC.sub.6 H.sub.4 OCH.sub.2 CH.sub.2 -- (1); ##STR13## wherein n represents an integer not less than 1; --(CH.sub.2).sub.m --(3) wherein m represents an integer of 4 to 20.
Claim 3
Dependent Claim
73 words
The toner according to claim 1, wherein said toner particles comprise coloring resin particles containing the binding resin composed of a styrene homopolymer or copolymer formed by dispersing a monomer composition containing at least monomers containing styrene, the coloring agent, the polar resin and the solid ester wax into an aqueous medium so as to form particles of the monomer composition; and by polymerizing the monomer in the particles of the monomer composition.
Claim 4
Dependent Claim
28 words
The toner according to claim 2, wherein said toner particles have a shape factor SF-1 of 100 to 150 and a shape factor SF-2 of 100 to 130.
Claim 5
Dependent Claim
22 words
The toner according to claim 2, wherein said monomers are styrene and acrylic ester, and said polar resin is a polyester resin.
Claim 6
Dependent Claim
22 words
The toner according to claim 2, wherein said monomers are styrene and methacrylic ester, and said polar resin is a polyester resin.
Claim 7
Dependent Claim
52 words
The toner according to claim 1, wherein said toner particles have a shape factor SF-1 of 100 to 150 and a shape factor SF-2 of 100 to 130, and said ester wax is encapsulated inside the toner particle by an outer shell resin layer formed from the binding resin and polar resin.
Claim 8
Dependent Claim
23 words
The toner according to claim 6, wherein said binding resin is a styrene/acrylic ester copolymer, and said polar resin is a polyester resin.
Claim 9
Dependent Claim
23 words
The toner according to claim 6, wherein said binding resin is a styrene/methacrylic ester copolymer, and said polar resin is a polyester resin.
Claim 10
Dependent Claim
15 words
The toner according to claim 1, wherein R 1 and R 3 are alkyl groups.
Claim 11
Dependent Claim
15 words
The toner according to claim 1, wherein R 4 and R 6 are alkyl groups.
Claim 12
Dependent Claim
29 words
The toner according to claim 1, wherein 5 to 40 parts by weight of said solid ester wax is contained per 100 parts by weight of the binding resin.
Claim 13
Dependent Claim
29 words
The toner according to claim 1, wherein 10 to 30 parts by weight of said solid ester wax is contained per 100 parts by weight of the binding resin.
Claim 14
Dependent Claim
15 words
The toner according to claim 1, wherein said toner particles are nonmagnetic cyan toner particles.
Claim 15
Dependent Claim
15 words
The toner according to claim 1, wherein said toner particles are nonmagnetic yellow toner particles.
Claim 16
Dependent Claim
15 words
The toner according to claim 1, wherein said toner particles are nonmagnetic magenta toner particles.
Claim 17
Dependent Claim
15 words
The toner according to claim 1, wherein said toner particles are nonmagnetic black toner particles.
Claim 18
Dependent Claim
20 words
The toner according to claim 1, wherein said solid ester wax has a melting point of 40° to 90° C.
Claim 19
Dependent Claim
20 words
The toner according to claim 1, wherein said solid ester wax has a melting point of 55° to 85° C.
Claim 20
Dependent Claim
20 words
The toner according to claim 1, wherein said solid ester wax has a solubility parameter (SP) of 7.5 to 10.5.
Claim 21
Dependent Claim
23 words
The toner according to claim 1, wherein said solid ester wax has a melt viscosity, at 130° C., of 1 to 300 cPs.
Claim 22
Dependent Claim
23 words
The toner according to claim 1, wherein said solid ester wax has a melt viscosity, at 130° C., of 3 to 50 cPs.
Claim 23
Dependent Claim
19 words
The toner according to claim 1, wherein said solid ester wax has a Vickers hardness of 0.3 to 5.0.
Claim 24
Dependent Claim
19 words
The toner according to claim 1, wherein said solid ester wax has a Vickers hardness of 0.5 to 3.0.
References Cited (Backward Citations)
US2297691A
Cited
US4917982A
Cited
US4921771A
Cited
JPS523305A
Cited
JPS523304A
Cited
US4299899A
Cited
JPS5613945A
Cited
JPS5752574A
Cited
JPS5953856A
Cited
JPS5961842A
Cited
JPH01185660A
Cited
JPH01185661A
Cited
JPH01185663A
Cited
JPH01185662A
Cited
JPH01238672A
Cited
EP0470479A1
Cited
JPH04107467A
Cited
JPH04149559A
Cited
JPH04301853A
Cited
JPH0561238A
Cited
US5476745A
Cited
EP0533172A1
Cited
US5314777A
Cited
EP0621511A1
Cited
EP0627669A1
Cited
US5510222A
Cited
EP0658816A2
Cited
US5604072A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-01-26 | 2001-07-28 | 2002-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-01-26 | 2005-07-28 | 2006-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-01-26 | 2009-07-28 | 2010-01-27 | $7700.00 | Window Closed / Lapsed |