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US4906604A
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Multi-color heat sensitive recording material
Assignee: New Oji Paper Co Ltd
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Filing: 1988-09-23
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Granted: 1990-03-06
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Expires: 2008-09-23
Abstract
Abstract In a multi-color heat sensitive recording material comprising a substrate and two or more heat sensitive color-forming layers thereon capable of forming different colors from each other, at least one of the heat sensitive color-forming layers containing a leuco dye and an acidic substance, the recording material characterized in that at least one piperidine derivative represented by the formula [I] ##STR1## wherein R 1 is C 1 ˜30 aliphatic group residue which may have C 2 ˜20 alkoxycarbonyl group, or C 1 ˜30 aliphatic group residue which has ether linkage and oxycarbonyl group; R 2 , R 3 , R 4 , R 5 and X are each methyl group or hydrogen atom; and l is an integer of 1 to 6, is incorporated at the position where a decolorizing function can be effected against the color-forming system comprising a leuco dye and an acidic substance.
Inventors
- 👤 Tosaku Okamoto
- 👤 Tomoyuki Okimoto
- 👤 Katsuhiko Ishida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:41
CPC Classifications
G; G03; G03G; G03G5/00; B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/337; B41M5/3375; B41M5/34; Y; Y10; Y10S; Y10S428/00; Y10S428/913
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
140 words
In a multi-color heat sensitive recording material comprising a substrate and two or more heat sensitive color-forming layers thereon capable of forming different colors from each other, at least one of the heat sensitive color-forming layers containing a leuco dye and an acidic substance, the recording material characterized in that at least one piperidine derivative represented by the formula [I] ##STR19## wherein R 1 is C 1 ˜30 aliphatic group residue which may have C 2 ˜20 alkoxycarbonyl group, or C 1 ˜30 aliphatic group residue which has ether linkage and oxycarbonyl group; R 2 , R 3 , R 4 , R 5 and X are each methyl group or hydrogen atom; and l is an integer of 1 to 6, is incorporated at the position sufficient to decolorized color-forming system comprising a leuco dye and an acidic substance.
Claim 2
Dependent Claim
140 words
In a multi-color heat sensitive recording material comprising a substrate and two or more heat sensitive color-forming layers thereon capable of forming different colors from each other, at least one of the heat sensitive color-forming layers containing a leuco dye and an acidic substance, the recording material characterized in that at least one piperidine derivative represented by the formula [I] ##STR19## wherein R 1 is C 1 ˜30 aliphatic group residue which may have C 2 ˜20 alkoxycarbonyl group, or C 1 ˜30 aliphatic group residue which has ether linkage and oxycarbonyl group; R 2 , R 3 , R 4 , R 5 and X are each methyl group or hydrogen atom; and l is an integer of 1 to 6, is incorporated at the position sufficient to decolorized color-forming system comprising a leuco dye and an acidic substance.
Claim 3
Dependent Claim
59 words
A multi-color heat sensitive recording material as defined in claim 1 wherein the piperidine derivative is a compound of the formula ##STR20## wherein R 6 is C 1 ˜20 aliphatic group residue which may have C 2 ˜20 alkoxycarbonyl group, R 2 , R 3 , R 4 , R 5 , X and l are same as above.
Claim 4
Dependent Claim
51 words
A multi-color heat sensitive recording material as defined in claim 2 wherein the piperidine derivative is a compound of the formula ##STR21## wherein R 7 is C 1 ˜10 aliphatic group residue, R 2 , R 3 , R 4 , R 5 , X and l are same as above.
Claim 5
Dependent Claim
53 words
A multi-color heat sensitive recording material as defined in claim 3 wherein the piperidine derivative is a compound of the formula ##STR22## wherein R 8 is C 2 ˜7 aliphatic group residue, m is 3 or 4, R 2 ,R 3 , R 4 , R 5 and X are same as above.
Claim 6
Dependent Claim
57 words
A multi-color heat sensitive recording material as defined in claim 1 wherein the piperidine derivative is a compound of the formula ##STR23## wherein R 9 is C 1 ˜5 aliphatic group residue, n is an integer of 1 to 3, R 2 , R 3 , R 4 , R 5 and X are same as above.
Claim 7
Dependent Claim
51 words
A multi-color heat sensitive recording material as defined in claim 5 wherein the piperidine derivative is a compound of the formula ##STR24## wherein R 10 is C 4 aliphatic group residue, p is 3, R 2 , R 3 , R 4 , R 5 and X are same as above.
Claim 8
Dependent Claim
35 words
A multi-color heat sensitive recording material as defined in claim 1 wherein the piperidine derivative is used in an amount of 0.1 to 20 times the total weight of the leuco dye and acidic substance.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-03-05 | 1993-09-04 | 1994-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-05 | 1997-09-04 | 1998-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-05 | 2001-09-04 | 2002-03-06 | $7700.00 | Window Closed / Lapsed |