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US4839332A
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Heat-sensitive recording material
Assignee: Fujifilm Holdings Corp
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Filing: 1988-01-15
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Granted: 1989-06-13
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Expires: 2008-01-15
Abstract
Abstract A heat-sensitive recording material is disclosed. The material is comprised of a support having thereon a heat-sensitive color forming layer comprising at least one electron-donating colorless dye and at least one electron-accepting compound, wherein the electron-donating colorless dye is a fluorene derivative having at least one substituted amino group and the electron-accepting compound has an acid group and a solubility in ethanol of 10 or less at 25° C. The material exhibits improved color developability, improved preservability before recording, improved image stability, and improved chemical resistance.
Inventors
- 👤 Kensuke Ikeda
- 👤 Naoto Yanagihara
- 👤 Ken Iwakura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:42
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/323; B41M5/333; B41M5/3333; B41M5/3335; B41M5/3336; Y; Y10; Y10S; Y10S428/00; Y10S428/913
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
63 words
A heat-sensitive recording material comprising a support having thereon a heat-sensitive color forming layer comprising at least one electron-donating colorless dye and at least on electron-accepting compound, wherein said electron-donating colorless dye is a fluorene derivative having at least one substituted amino group and said electron-accepting compound has an acid group and a solubility in ethanol of 10 or less at 25° C.
Claim 2
Dependent Claim
63 words
A heat-sensitive recording material comprising a support having thereon a heat-sensitive color forming layer comprising at least one electron-donating colorless dye and at least on electron-accepting compound, wherein said electron-donating colorless dye is a fluorene derivative having at least one substituted amino group and said electron-accepting compound has an acid group and a solubility in ethanol of 10 or less at 25° C.
Claim 3
Dependent Claim
25 words
A heat-sensitive recording material as claimed in claim 1, wherein said electron-accepting compound has a solubility in ethanol of 5 or less at 25° C.
Claim 4
Dependent Claim
25 words
A heat-sensitive recording material as claimed in claim 1, wherein said electron-accepting compound has a solubility in ethanol of 2 or less at 25° C.
Claim 5
Dependent Claim
23 words
A heat-sensitive recording material as claimed in claim 1, wherein the recording material further comprises a protective layer on the color forming layer.
Claim 6
Dependent Claim
25 words
A heat-sensitive recording material as claimed in claim 4, wherein the recording material further comprises an adhesive layer on the back side of the support.
Claim 7
Dependent Claim
96 words
A heat-sensitive recording material as claimed in claim 1, wherein said electron-accepting compound is selected from the group consisting of salicylic acid derivatives represented by formulae (I-a) to (I-c): ##STR11## wherein R represents a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted acyl group, a substituted or unsubstituted acylamino group or a substituted or unsubstituted aryl group; and X represents a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryl group or a halogen atom; and metal salts thereof.
Claim 8
Dependent Claim
19 words
A heat-sensitive recording material as claimed in claim 6, wherein the metal salts are zinc salts or magnesium salts.
Claim 9
Dependent Claim
52 words
A heat-sensitive recording material as claimed in claim 6, wherein R is an aryloxyalkoxy group represented by formula (I-d): --O--(C.sub.m H.sub.2m --O).sub.n --Ar (I-d) wherein Ar represents a substituted or unsubstituted aryl group, m represents an integer of from 1 to 10, and n represents an integer of from 1 to 3.
Claim 10
Dependent Claim
22 words
A heat-sensitive recording material as claimed in claim 6, wherein R is positioned at the paraposition with respect to the COOH group.
Claim 11
Dependent Claim
20 words
A heat-sensitive recording material as claimed in claim 6, wherein said salicylic acid derivatives contain 13 or more carbon atoms.
Claim 12
Dependent Claim
71 words
A heat-sensitive recording material as claimed in claim 1, wherein said fluorene derivative is represented y formula (VI): ##STR12## wherein X 11 and Y 11 , which may be the same or defferent, each represents an amine residual group; Z 11 represents a hydrogen atom Or a substituted amino group; and A 11 represents a group necessary for forming a 5- or 6-membered heterocyclic ring containing at least one hetero atom.
Claim 13
Dependent Claim
77 words
A heat-sensitive recording material as claimed in claim 11, wherein A 11 represents ##STR13## wherein a bond indicated by * denotes the position at which the group is connected to the benzene ring in formula (VI) and a bond indicated by ** denotes the position at which the group is connected to the fluorene ring in formula (VI), R' represents a hydrogen atom or an alkyl group, and R" represents an alkyl group or an acyl group.
Claim 14
Dependent Claim
38 words
A heat-sensitive recording material as claimed in claim 11, wherein the amine residual group as represented X 11 , Y 11 , or Z 11 is a secondary amine residual group having from 2 to 16 carbon atoms.
References Cited (Backward Citations)
US3928686A
Cited
US4211436A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-12 | 1992-12-12 | 1993-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-12 | 1996-12-12 | 1997-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-12 | 2000-12-12 | 2001-06-13 | $7700.00 | Window Closed / Lapsed |