US5376616A
Expired / Lapsed
US
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Reversible heat-sensitive recording composition and reversible heat-sensitive recording sheet
Assignee: Nitto Denko Corp
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Filing: 1993-12-23
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Granted: 1994-12-27
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Expires: 2013-12-23
Abstract
Abstract A reversible heat-sensitive recording composition capable of repeatedly writing or erasing, and a reversible heat-sensitive recording sheet using the composition are disclosed. The reversible heat-sentitive recording composition comprising a leuco compound as a coloring agent and a pyridine derivative having at least one substituent selected from the group consisting of a carboxyl group and a phenolic hydroxyl group.
Inventors
- 👤 Katsuhisa Hamano
- 👤 Yutaka Nakabayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:02
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/305
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
36 words
A reversible heat-sensitive recording composition comprising a leuco compound as a coloring agent and a pyridine derivative having at least one substituent selected from the group consisting of a carboxyl group and a phenolic hydroxyl group.
Claim 2
Dependent Claim
36 words
A reversible heat-sensitive recording composition comprising a leuco compound as a coloring agent and a pyridine derivative having at least one substituent selected from the group consisting of a carboxyl group and a phenolic hydroxyl group.
Claim 3
Dependent Claim
77 words
The reversible heat-sensitive recording composition of claim 1, wherein the pyridine derivative is represented by the following formula ##STR7## wherein R 1 represents a carboxyl group or a phenolic hydroxyl group and R 2 represents hydrogen atom, a carboxyl group, or a phenolic hydroxyl group; or by the following formula ##STR8## wherein R 3 represents a carboxyl group or a phenolic hydroxyl group and R 4 represents hydrogen atom, a carboxyl group, or a phenolic hydroxyl group.
Claim 4
Dependent Claim
34 words
The reversible heat-sensitive recording composition of claim 1, wherein the leuco compound is used in an amount of from 0.1 to 1.0 part by weight per 1 part by weight of the pyridine derivative.
Claim 5
Dependent Claim
13 words
The reversible heat-sensitive recording composition of claim 1, which further comprises a binder.
Claim 6
Dependent Claim
32 words
The reversible heat-sensitive recording composition of claim 1, wherein the binder is used in an amount of 5 parts by weight or less per 1 part by weight of the pyridine derivative.
Claim 7
Dependent Claim
45 words
A reversible heat-sensitive recording sheet comprising a substrate having formed thereon a recording layer containing a leuco compound as a coloring agent and a pyridine derivative having at least one substituent selected from the group consisting of a carboxyl group and a phenolic hydroxyl group.
Claim 8
Dependent Claim
45 words
A reversible heat-sensitive recording sheet comprising a substrate having formed thereon a recording layer containing a leuco compound as a coloring agent and a pyridine derivative having at least one substituent selected from the group consisting of a carboxyl group and a phenolic hydroxyl group.
Claim 9
Dependent Claim
77 words
The reversible heat-sensitive recording sheet of claim 6, wherein the pyridine derivative is represented by the following formula ##STR9## wherein R 1 represents a carboxyl group or a phenolic hydroxyl group and R 2 represents hydrogen atom, a carboxyl group, or a phenolic hydroxyl group; or by the following formula ##STR10## wherein R 3 represents a carboxyl group or a phenolic hydroxyl group and R 1 represents hydrogen atom, a carboxyl group, or a phenolic hydroxyl group.
References Cited (Backward Citations)
US4687862A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-12-26 | 1998-06-27 | 1998-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-12-26 | 2002-06-27 | 2002-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-12-26 | 2006-06-27 | 2006-12-27 | $7700.00 | Window Closed / Lapsed |