US4433040A
Expired / Lapsed
US
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Electrophotographic toner containing a metal complex dye
Assignee: Hodogaya Chemical Co Ltd
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Filing: 1981-12-28
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Granted: 1984-02-21
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Expires: 2001-12-28
Abstract
Abstract An electrophotographic toner effective for producing clear visible images, comprises a binder resin, and a charge-controlling and coloring agent comprising at least one 2:1 type metal complex of the formula (I): <IMAGE> (I) wherein M is Cr or Co, n is 1 or 2, Y is H or a radical of the formula (II): <IMAGE> (II) wherein X is H, a halogen, a lower alkyl, a lower alkoxy or a nitro and m is 1, 2 or 3.
Inventors
- 👤 Isao Niimura
- 👤 Hiroshi Imagome
- 👤 Hiroyoshi Yamaga
- 👤 Noboru Akuzawa
- 👤 Kenji Yuta
- 👤 Takeo Kurahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:31
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/09; G03G9/0906; G03G9/0918
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
113 words
An electrophotographic toner capable of being electrified negatively comprising (a) a binder resin; and (b) an agent for coloring said toner and for controlling the negative charge of said toner comprising at least one 2:1 type metal complex of the formula (I): ##STR34## wherein M represents a member selected from the group consisting of chromium and cobalt atoms, n represents an integer of 1 or 2, and Y represents a member selected from radicals of the formula (II): ##STR35## wherein X represents a member selected from the group consisting of hydrogen and halogen atoms, lower alkyl radicals, lower alkoxy radicals and nitro radicals, and m represents an integer of from 1 to 3.
Claim 2
Dependent Claim
113 words
An electrophotographic toner capable of being electrified negatively comprising (a) a binder resin; and (b) an agent for coloring said toner and for controlling the negative charge of said toner comprising at least one 2:1 type metal complex of the formula (I): ##STR34## wherein M represents a member selected from the group consisting of chromium and cobalt atoms, n represents an integer of 1 or 2, and Y represents a member selected from radicals of the formula (II): ##STR35## wherein X represents a member selected from the group consisting of hydrogen and halogen atoms, lower alkyl radicals, lower alkoxy radicals and nitro radicals, and m represents an integer of from 1 to 3.
Claim 3
Dependent Claim
25 words
A toner as claimed in claim 1, wherein in the formula (II), the lower alkyl radicals represented by X have 1 to 4 carbon atoms.
Claim 4
Dependent Claim
25 words
A toner as claimed in claim 1, wherein in the formula (II), the lower alkoxy radicals represented by X have 1 to 4 carbon atoms.
Claim 5
Dependent Claim
30 words
A toner as claimed in claim 1, wherein said charge-controlling and coloring agent is present in an amount of 1 to 50% based on the weight of the binder resin.
References Cited (Backward Citations)
US3165420A
Cited
US3915874A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-20 | 1987-08-22 | 1988-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-20 | 1991-08-22 | 1992-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-20 | 1995-08-22 | 1996-02-21 | $7700.00 | Window Closed / Lapsed |