US5124225A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toner for developing static charge images
Assignee: Tomoegawa Co Ltd
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Filing: 1990-07-10
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Granted: 1992-06-23
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Expires: 2010-07-10
Abstract
Abstract A toner for developing static charge images is disclosed which comprises 1 to 15 parts by weight of waxes whose DSC heat absorption regions exist only at a temperature no lower than 50° C. and 100 parts by weight of a binder resin. As for such waxes, there can be used waxes which have been purified by removing fatty acids whose DSC heat absorption regions exist at temperatures no higher than 50° C.
Inventors
- 👤 Kohsei Shibata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:32
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08775; G03G9/08782; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/105
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
101 words
A toner for developing static charge images comprising 1-15 parts by weight of natural wax, which wax consists essentially of a fatty acid ester which is insoluble in water and having a DSC heat absorption region at a temperature of greater than or equal to 50° C. and containing fatty acid impurities, said impurities having a DSC heat absorption region at a temperature less than 50° C., wherein said wax has been purified by removal of said fatty acid impurities whose heat absorption regions exist at a temperature less than 50° C., and 100 parts by weight of a binder resin.
Claim 2
Dependent Claim
101 words
A toner for developing static charge images comprising 1-15 parts by weight of natural wax, which wax consists essentially of a fatty acid ester which is insoluble in water and having a DSC heat absorption region at a temperature of greater than or equal to 50° C. and containing fatty acid impurities, said impurities having a DSC heat absorption region at a temperature less than 50° C., wherein said wax has been purified by removal of said fatty acid impurities whose heat absorption regions exist at a temperature less than 50° C., and 100 parts by weight of a binder resin.
Claim 3
Dependent Claim
42 words
A toner for developing static charge images as claimed in claim 1, wherein said binder resin is at least one resin selected from the group consisting of polystyrene, styrene/acrylics, polyacrylate, polyethylene, styrene/butadiene copolymer, polyamide, polyvinyl chloride, vinyl chloride/vinyl acetate copolymer and polyester.
Claim 4
Dependent Claim
29 words
A toner for developing static charge images as claimed in claim 2, wherein said binder resin is at least one resin selected from the group consisting of styrene/acrylics, polyester.
Claim 5
Dependent Claim
19 words
A toner for developing static charge images as claimed in claim 1, wherein said toner further comprises a colorant.
Claim 6
Dependent Claim
40 words
A toner for developing static charge images as claimed in claim 4, wherein said colorant is selected from the group consisting of carbon black, nigrosine dye, aniline dye, Chrome Yellow, Ultramarine Blue, Methylene Blue Chloride, Rose Bengale, magnetite and ferrite.
Claim 7
Dependent Claim
28 words
A toner for developing static charge images as claimed in claim 1, wherein said toner further comprises an charge control agent, an antioxidant and a flowability improving agent.
Claim 8
Dependent Claim
29 words
A toner for developing static charge images as claimed in claim 6, wherein said flowability improving agent is selected from the group consisting of colloidal silica and colloidal alumina.
References Cited (Backward Citations)
US4535049A
Cited
JPS59174852A
Cited
DE3502748A1
Cited
US4556624A
Cited
US4851045A
Cited
JPH01109360A
Cited
US4824553A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-23 | 1995-12-23 | 1996-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-23 | 1999-12-23 | 2000-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-23 | 2003-12-23 | 2004-06-23 | $7700.00 | Window Closed / Lapsed |