US4981836A
Expired / Lapsed
US
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Recording material
Assignee: Fujifilm Corp
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Filing: 1989-11-03
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Granted: 1991-01-01
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Expires: 2009-11-03
Abstract
Abstract A recording material is disclosed, which comprises a support having thereon a recording layer comprising at least one electron-donating colorless dye and at least one electron-accepting compound, wherein said electron-donating colorless dye is a fluorene derivative having a substituted amino group at the 3-position and the 5-position or a substituted amino group at the 2-position and the 6-position. The recording material gives colored portions having light absorption at near infrared region, has improved coloring property and shelf life, and gives colored images having improved stability.
Inventors
- 👤 Naoto Yanagihara
- 👤 Ken Iwakura
- 👤 Hiroo Fukunaga
- 👤 Akira Igarashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:21
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/323; B41M5/327
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
146 words
A recording material comprising a support having thereon a recording layer comprising at least one electron-donating colorless dye and at least one electron-accepting compound, wherein said electron-donating colorless dye is a fluorene derivative represented by the formula (II): ##STR14## wherein R 1 , R 2 , R 3 and R 4 , which may be the same or different, each represents an alkyl group or a substituted alkyl group; R 5 and R 6 each represents a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, an acyl group, a substituted amino group, a cyano group, a nitro group, an alkylthio group, or an aryl group and ring A is selected from ##STR15## wherein R 22 and R 23 each represents a methyl group, an ethyl group, a propyl group or a butyl group, and Z represents a hydrogen atom or a nitro group.
Claim 2
Dependent Claim
146 words
A recording material comprising a support having thereon a recording layer comprising at least one electron-donating colorless dye and at least one electron-accepting compound, wherein said electron-donating colorless dye is a fluorene derivative represented by the formula (II): ##STR14## wherein R 1 , R 2 , R 3 and R 4 , which may be the same or different, each represents an alkyl group or a substituted alkyl group; R 5 and R 6 each represents a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, an acyl group, a substituted amino group, a cyano group, a nitro group, an alkylthio group, or an aryl group and ring A is selected from ##STR15## wherein R 22 and R 23 each represents a methyl group, an ethyl group, a propyl group or a butyl group, and Z represents a hydrogen atom or a nitro group.
Claim 3
Dependent Claim
35 words
A recording material as in claim 1, wherein R 1 and R 2 or R 3 and R 4 combine with each other to form a ring having a hetero atom or an unsubstituted bond.
Claim 4
Dependent Claim
25 words
A recording material as in claim 1, wherein R 22 and R 23 each represents an ethyl group, a propyl group or a butyl group.
Claim 5
Dependent Claim
147 words
A recording material comprising a support having thereon a recording layer comprising at least one electron-donating colorless dye and at least one electron-donating compound, wherein said electron-donating colorless dye is a fluorene derivative represented by formula (A) or formula (B): ##STR16## wherein R 11 , R 12 , R 13 , R 14 , R 15 , and R 16 each represents an alkyl group, and R 17 represents a hydrogen atom or a chlorine atom; ##STR17## wherein R 18 , R 19 , R 20 and R 21 , which may be the same or different, each represents an alkyl group or an aralkyl group, R 22 and R 23 , which may be the same or different, each represents an alkyl group, R 24 represents an alkyl group, an aryl group or an acylamino group, and Z represents an oxygen atom or a sulfur atom.
Claim 6
Dependent Claim
147 words
A recording material comprising a support having thereon a recording layer comprising at least one electron-donating colorless dye and at least one electron-donating compound, wherein said electron-donating colorless dye is a fluorene derivative represented by formula (A) or formula (B): ##STR16## wherein R 11 , R 12 , R 13 , R 14 , R 15 , and R 16 each represents an alkyl group, and R 17 represents a hydrogen atom or a chlorine atom; ##STR17## wherein R 18 , R 19 , R 20 and R 21 , which may be the same or different, each represents an alkyl group or an aralkyl group, R 22 and R 23 , which may be the same or different, each represents an alkyl group, R 24 represents an alkyl group, an aryl group or an acylamino group, and Z represents an oxygen atom or a sulfur atom.
References Cited (Backward Citations)
US4658276A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-31 | 1994-07-02 | 1995-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-31 | 1998-07-02 | 1999-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-31 | 2002-07-02 | 2003-01-01 | $7700.00 | Window Closed / Lapsed |