US4507670A
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Thermosensitive recording material
Assignee: Ricoh Co Ltd
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Filing: 1984-01-24
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Granted: 1985-03-26
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Expires: 2004-01-24
Abstract
Abstract A thermosensitive recording material comprising a support material and a thermosensitive recording layer formed thereon, in which thermosensitive coloring layer, colored images are formed by the reaction between a colorless or light-colored leuco dye of the following formula (I) and a color developer of the following formula (II) which is capable of inducing color formation in the leuco dye upon application of heat thereto, ##STR1## wherein R 1 and R 2 each indicate a lower alkyl group, and X indicates halogen, ##STR2## wherein R 3 and R 4 each indicate hydrogen, halogen, an alkyl group, an acyl group, a halogenated alkyl group or an unsubstituted or substituted aromatic group.
Inventors
- 👤 Takanori Motosugi
- 👤 Hisashi Sakai
- 👤 Kiyotaka Iiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:06
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/323; B41M5/327; B41M5/3275; B41M5/333; B41M5/3333
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
109 words
A thermosensitive recording material comprising a support material and a thermosensitive recording layer formed thereon, in which thermosensitive coloring layer, colored images are formed by the reaction between a colorless or light-colored leuco dye of the following formula (I) and a color developer of the following formula (II) which is capable of inducing color formation in the leuco dye upon application of heat thereto, ##STR5## wherein R 1 and R 2 each indicate a lower alkyl group, and X indicates halogen, ##STR6## wherein R 3 and R 4 each indicate hydrogen, halogen, an alkyl group, an acyl group, a halogenated alkyl group or an unsubstituted or substituted aromatic group.
Claim 2
Dependent Claim
109 words
A thermosensitive recording material comprising a support material and a thermosensitive recording layer formed thereon, in which thermosensitive coloring layer, colored images are formed by the reaction between a colorless or light-colored leuco dye of the following formula (I) and a color developer of the following formula (II) which is capable of inducing color formation in the leuco dye upon application of heat thereto, ##STR5## wherein R 1 and R 2 each indicate a lower alkyl group, and X indicates halogen, ##STR6## wherein R 3 and R 4 each indicate hydrogen, halogen, an alkyl group, an acyl group, a halogenated alkyl group or an unsubstituted or substituted aromatic group.
Claim 3
Dependent Claim
37 words
A thermosensitive recording material as claimed in claim 1, wherein said lower alkyl group represented by each of R 1 and R 2 in the formula (I) is an alkyl group having 1 to 5 carbon atoms.
Claim 4
Dependent Claim
63 words
A thermosensitive recording material as claimed in claim 1, wherein said aromatic group represented by each of R 3 and R 4 in said formula (II) is selected from the group consisting of an aryl group and an aralkyl group, and a substituent of said aromatic group is selected from the group consisting of halogen, an acyl group and a halogenated alkyl group.
Claim 5
Dependent Claim
26 words
A thermosensitive recording material as claimed in claim 1, wherein said thermosensitive coloring layer comprises as the main components said leuco dye and said color developer.
Claim 6
Dependent Claim
44 words
A thermosensitive recording material as claimed in claim 4, wherein the amount of said inorganic color developer is 5.0 parts by weight or less with respect to 1 part by weight of said color developer of the formula (II) in said thermosensitive coloring layer.
Claim 7
Dependent Claim
36 words
A thermosensitive recording material as claimed in claim 1, wherein said thermosensitive coloring layer comprises at least two layers, with said leuco dye contained in one layer and said color developer contained in the other layer.
Claim 8
Dependent Claim
88 words
A thermosensitive recording material as claimed in claim 1, wherein said thermosensitive coloring layer contans said color developer, constituting an image receiving layer formed on said support material, with said image receiving layer and said support material integrally constituting an image receiving sheet, and said leuco dye is contained in an image transfer layer formed on another support material, constituting an image transfer layer formed on said second mentioned support material, with said image transfer layer and said second mentioned support material integrally constituting an image transfer sheet.
Claim 9
Dependent Claim
88 words
A thermosensitive recording material as claimed in claim 1, wherein said thermosensitive coloring layer contains said leuco dye, constituting an image receiving layer formed on said support material, with said image receiving layer and said support material integrally constituting an image receiving sheet, and said color developer is contained in an image transfer layer formed on another support material, constituting an image transfer layer formed on said second mentioned support material, with said image transfer layer and said second mentioned support material integrally constituting an image transfer sheet.
Claim 10
Dependent Claim
48 words
A thermosensitive recording material as claimed in claim 1, wherein said thermosensitive coloring layer further comprises an inorganic color developer selected from the group consisting of zinc chloride, magnesium chloride, aluminium chloride, active terra abla, acidic terra abla, bentonite, colloidal silica, aluminium silicate, magnesium silicate and zinc silicate.
Claim 11
Dependent Claim
60 words
A thermosensitive recording material as claimed in claim 1, wherein said thermosensitive coloring layer further comprises a binder agent selected from the group consisting of polyvinyl alcohol, starch and derivatives thereof, methoxycellulose, hydroxyethylcellulose, carboxymethylcellulose, sodium polyacrylate, polyvinyl pyrrolidone, styrene/maleic anhydride copolymer, isobutylene/maleic anhydride copolymer, polyacrylamide and gelatin, SBR latex, styrene/acrylic acid ester copolymer, vinyl chloride/vinyl acetate copolymer and polybutyl methacrylate.
Claim 12
Dependent Claim
37 words
A thermosensitive recording material as claimed in claim 1, wherein said thermosensitive coloring layer further comprises an auxiliary additive selected from the group consisting of calcium carbonate, zinc oxide, silica, barium sulfate, aluminum stearate and urea-formaldehyde resin.
Claim 13
Dependent Claim
32 words
A thermosensitive recording material as claimed in claim 1, wherein said thermosensitive coloring layer further comprises a thermo-fusible material with a melting point ranging from about 70° C. to about 150° C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-03-25 | 1988-09-24 | 1989-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-25 | 1992-09-24 | 1993-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-25 | 1996-09-24 | 1997-03-26 | $7700.00 | Window Closed / Lapsed |