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US5120702A
Expired / Lapsed
US
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Heat-sensitive recording material
Assignee: Nippon Paper Industries Co Ltd
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Filing: 1990-07-17
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Granted: 1992-06-09
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Expires: 2010-07-17
Abstract
Abstract A heat-sensitive recording material has a support and a color-developing layer which comprises as an organic color-developing agent 4-hydroxy-4'-n-propoxydiphenylsulfone and as a stabilizer a particular stabilizer. This heat-sensitive recording material is suitable for a high density-and speed-recording and is superior in the thermal preservability.
Inventors
- 👤 Toshiaki Minami
- 👤 Tadakazu Fukuchi
- 👤 Toshio Kaneko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:50
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/333; B41M5/3333; B41M5/3335; B41M5/3336; B41M5/337; B41M5/3375
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
62 words
A heat-sensitive recording material comprising a substrate having thereon a color-developing layer which comprises at least one colorless or pale colored basic chromogenic dyestuff and an organic color-developing agent, said organic color-developing layer comprising both 4-hydroxy-4'-n-propoxydiphenylsulfone as a color-developing agent and at least one stabilizer selected from the group consisting of bis (3-t-butyl-4-hydroxy-6-methyl-phenyl) sulfone, 4,4'-sulfinylbis(2-t-butyl-5-methylphenol), 4,4'-butylidene bis (3-methyl-6-butylphenol), and bis (3,5-dibromo-4-hydroxyphenyl) sulfone.
Claim 2
Dependent Claim
62 words
A heat-sensitive recording material comprising a substrate having thereon a color-developing layer which comprises at least one colorless or pale colored basic chromogenic dyestuff and an organic color-developing agent, said organic color-developing layer comprising both 4-hydroxy-4'-n-propoxydiphenylsulfone as a color-developing agent and at least one stabilizer selected from the group consisting of bis (3-t-butyl-4-hydroxy-6-methyl-phenyl) sulfone, 4,4'-sulfinylbis(2-t-butyl-5-methylphenol), 4,4'-butylidene bis (3-methyl-6-butylphenol), and bis (3,5-dibromo-4-hydroxyphenyl) sulfone.
Claim 3
Dependent Claim
28 words
The heat-sensitive recording material according to claim 1, wherein said dyestuff is selected from the group consisting of triphenylmethane dyestuff, fluorane dyestuff, azaphtalide dyestuff and fluorene leuco dyestuff.
Claim 4
Dependent Claim
55 words
The heat-sensitive recording material according to claim 1, wherein said color-developing layer comprises 1-12 parts by weight of organic color-developing agent, 0.1-1 part by weight of stabilizer and 1-20 parts by weight of filler, based on 1 part by weight of basic colorless dyestuff and 10-25% by weight of a binder in total solid content.
Claim 5
Dependent Claim
16 words
The heat-sensitive recording material according to claim 1, wherein said color-developing layer comprises further a sensitizer.
Claim 6
Dependent Claim
26 words
The heat-sensitive recording material according to claim 1, wherein said substrate is at least one substance selected from the group consisting of papers and synthetic papers.
Claim 7
Dependent Claim
15 words
The heat-sensitive recording material according to claim 1, wherein said substrate is a plastic film.
Claim 8
Dependent Claim
23 words
The heat-sensitive recording material according to claim 1, wherein an over-coating layer composed of a polymeric substance is superposed on said heat-sensitive layer.
References Cited (Backward Citations)
US4771033A
Cited
US4895828A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-09 | 1995-12-09 | 1996-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-09 | 1999-12-09 | 2000-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-09 | 2003-12-09 | 2004-06-09 | $7700.00 | Window Closed / Lapsed |