US5710094A
Expired / Lapsed
US
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Reversible multi-color thermal recording medium
Assignee: Nippon Paper Industries Co Ltd
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Filing: 1995-10-27
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Granted: 1998-01-20
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Expires: 2015-10-27
Abstract
Abstract To provide a reversible multi-color thermal recording medium or a reversible multi-color optical recording medium which uses novel urea and thiourea derivatives and has excellent heat resistance. A reversible multi-color thermal recording medium having an irreversible thermal composition containing a colorless or pale basic achromatic dye and an organic color developer as main components and a reversible thermal composition containing a colorless or pale basic achromatic dye and an organic color developer as main components laminated on a support, the organic color developer contained in the irreversible thermal composition being an irreversible heat-resistant color developer and the organic color developer contained in the reversible thermal composition being a reversible heat-resistant color developer.
Inventors
- 👤 Toshiaki Minami
- 👤 Tomoaki Nagai
- 👤 Kaoru Hamada
- 👤 Akio Sekine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:07
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/244; G11B7/246; B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/305; B41M5/333; B41M5/3333; B41M5/3335; B41M5/34; B41M5/3336; G11B7/252; G11B7/254; G11B7/2542
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
271 words
A reversible multi-color thermal recording medium comprising an irreversible thermal composition recording layer containing a colorless or pale basic achromatic dye and an organic irreversible heat-resistant color developer as main components and a reversible multi-color thermal composition recording layer containing a colorless or pale basic achromatic dye and an organic reversible heat-resistant color developer as main components laminated on a support, wherein the reversible heat-resistant color developer is represented by the following formula (I): ##STR9## wherein X is selected from the group consisting of a hydrogen atom, alkyl group having 1 to 12 carbon atoms, halogenated alkyl group having 1 to 3 carbon atoms, alkoxy group having 1 to 12 carbon atoms, alkoxycarbonyl group having 1 to 12 carbon atoms, acyl group having 1 to 12 carbon atoms, dialkylamino group having 1 to 12 carbon atoms, nitro group, cyano group and halogen atom, m is an integer of 1 to 12, and n is an integer of 1 to 3, or the following formula (I'): ##STR10## wherein R is an alkyl group having 12 to 22 carbon atoms, A is selected from the group consisting of a lower alkyl group, lower alkoxy group, lower alkoxycarbonyl group, nitro group, halogen atom and hydrogen atom, and n is an integer of 1 to 3, and the irreversible heat-resistant color developer is represented by the following formula (II): ##STR11## wherein X is selected from the group consisting of a lower alkyl group having 1 to 4 carbon atoms, alkoxy group having 1 to 3 carbon atoms, hydrogen atom, nitro group, cyano group and halogen atom, and m is an integer of 1 to 3.
Claim 2
Dependent Claim
271 words
A reversible multi-color thermal recording medium comprising an irreversible thermal composition recording layer containing a colorless or pale basic achromatic dye and an organic irreversible heat-resistant color developer as main components and a reversible multi-color thermal composition recording layer containing a colorless or pale basic achromatic dye and an organic reversible heat-resistant color developer as main components laminated on a support, wherein the reversible heat-resistant color developer is represented by the following formula (I): ##STR9## wherein X is selected from the group consisting of a hydrogen atom, alkyl group having 1 to 12 carbon atoms, halogenated alkyl group having 1 to 3 carbon atoms, alkoxy group having 1 to 12 carbon atoms, alkoxycarbonyl group having 1 to 12 carbon atoms, acyl group having 1 to 12 carbon atoms, dialkylamino group having 1 to 12 carbon atoms, nitro group, cyano group and halogen atom, m is an integer of 1 to 12, and n is an integer of 1 to 3, or the following formula (I'): ##STR10## wherein R is an alkyl group having 12 to 22 carbon atoms, A is selected from the group consisting of a lower alkyl group, lower alkoxy group, lower alkoxycarbonyl group, nitro group, halogen atom and hydrogen atom, and n is an integer of 1 to 3, and the irreversible heat-resistant color developer is represented by the following formula (II): ##STR11## wherein X is selected from the group consisting of a lower alkyl group having 1 to 4 carbon atoms, alkoxy group having 1 to 3 carbon atoms, hydrogen atom, nitro group, cyano group and halogen atom, and m is an integer of 1 to 3.
Claim 3
Dependent Claim
35 words
A reversible multi-color thermal recording medium according to claim 1, wherein the irreversible thermal composition recording layer and the reversible thermal composition recording layer are laminated on said support with an intermediate layer interposed therebetween.
Claim 4
Dependent Claim
80 words
A reversible multi-color thermal recording medium according to claim 1, wherein the irreversible heat-resistant color developer is represented by the following general formula (III): ##STR12## wherein X, R1, R2, R3, R4, R5, R6, R7 and R8 are independently selected from the group consisting of a lower alkyl group having 1 to 6 carbon atoms, alkoxy group having 1 to 6 carbon atoms, hydrogen atom, nitro group, cyano group and halogen atom, and m is an integer of 1 to 3.
Claim 5
Dependent Claim
76 words
A reversible multi-color thermal recording medium according to claim 1, wherein the irreversible heat-resistant color developer is represented by the following general formula (IV): ##STR13## wherein X is selected from the group consisting of a lower alkyl group having 1 to 6 carbon atoms, alkoxy group having 1 to 6 carbon atoms, nitro group, halogen atom and hydrogen atom, m is an integer of 1 to 12, and n is an integer of 1 or 2.
Claim 6
Dependent Claim
124 words
A reversible multi-color thermal recording medium according to claim 1, wherein the irreversible heat-resistant color developer is represented by the following general formula (V): ##STR14## wherein X is selected from the group consisting of an alkyl group having 1 to 12 carbon atoms, alkoxy group having 1 to 12 carbon atoms, trihalogenated methyl group, hydrogen atom, nitro group and halogen atom, Z is selected from the group consisting of O, S, straight chain having 1 to 12 carbon atoms, branched alkylene group, NH, SO 2 and C═O, R1, R2 and R3 are independently selected from the group consisting of an alkyl group having 1 to 6 carbon atoms, hydrogen atom, nitro group and halogen atom, and n is an integer of 1 to 3.
Claim 7
Dependent Claim
219 words
A reversible multi-color thermal recording medium comprising an irreversible thermal composition recording layer containing a colorless or pale basic achromatic dye and an organic irreversible heat-resistant color developer as main components and a reversible multi-color thermal composition recording layer containing a colorless or pale basic achromatic dye and an organic reversible heat-resistant color developer as main components laminated on a support, wherein the reversible heat-resistant color developer is represented by the following formula (I): ##STR15## wherein X is selected from the group consisting of a hydrogen atom, alkyl group having 1 to 12 carbon atoms, halogenated alkyl group having 1 to 3 carbon atoms, alkoxy group having 1 to 12 carbon atoms, alkoxycarbonyl group having 1 to 12 carbon atoms, acyl group having 1 to 12 carbon atoms, dialkylamino group having 1 to 12 carbon atoms, nitro group, cyano group and halogen atom, m is an integer of 1 to 12, and n is an integer of 1 to 3, and the irreversible heat-resistant color developer is represented by the following formula (II): ##STR16## wherein X is selected from the group consisting of a lower alkyl group having 1 to 4 carbon atoms, alkoxy group having 1 to 3 carbon atoms, hydrogen atom, nitro group, cyano group and halogen atom, and m is an integer of 1 to 3.
Claim 8
Dependent Claim
219 words
A reversible multi-color thermal recording medium comprising an irreversible thermal composition recording layer containing a colorless or pale basic achromatic dye and an organic irreversible heat-resistant color developer as main components and a reversible multi-color thermal composition recording layer containing a colorless or pale basic achromatic dye and an organic reversible heat-resistant color developer as main components laminated on a support, wherein the reversible heat-resistant color developer is represented by the following formula (I): ##STR15## wherein X is selected from the group consisting of a hydrogen atom, alkyl group having 1 to 12 carbon atoms, halogenated alkyl group having 1 to 3 carbon atoms, alkoxy group having 1 to 12 carbon atoms, alkoxycarbonyl group having 1 to 12 carbon atoms, acyl group having 1 to 12 carbon atoms, dialkylamino group having 1 to 12 carbon atoms, nitro group, cyano group and halogen atom, m is an integer of 1 to 12, and n is an integer of 1 to 3, and the irreversible heat-resistant color developer is represented by the following formula (II): ##STR16## wherein X is selected from the group consisting of a lower alkyl group having 1 to 4 carbon atoms, alkoxy group having 1 to 3 carbon atoms, hydrogen atom, nitro group, cyano group and halogen atom, and m is an integer of 1 to 3.
Claim 9
Dependent Claim
35 words
A reversible multi-color thermal recording medium according to claim 6, wherein the irreversible thermal composition recording layer and the reversible thermal composition recording layer are laminated on said support with an intermediate layer interposed therebetween.
Claim 10
Dependent Claim
29 words
A reversible multi-color thermal recording medium according to claim 6 wherein in the formula II X is C 1 to C 4 alkyl and m is 1 or 2.
Claim 11
Dependent Claim
39 words
A reversible multi-color thermal recording medium according to claim 6 wherein in the formula II X is a member selected from the group consisting of Cl, Br, F, I, NO z and CN and m is 1 or 2.
Claim 12
Dependent Claim
30 words
A reversible multi-color thermal recording medium according to claim 6 wherein in the formula II X is C 1 to C 2 alkoxy group and m is 1 or 2.
Claim 13
Dependent Claim
34 words
A reversible multi-color thermal recording medium prepared by laminating a plastic film on the recorded surface of the reversible multi-color thermal recording medium of claim 6 or the entire recording medium after thermal recording.
Claim 14
Dependent Claim
33 words
A reversible multi-color optical recording medium which contains a light absorbent for absorbing light and converting it into heat in the recording layer of the reversible multi-color thermal recording medium of claim 6.
Claim 15
Dependent Claim
29 words
An optical recording medium prepared by laminating a plastic film on the recording surface of the reversible multi-color optical recording medium of claim 12 or the entire recording medium.
Claim 16
Dependent Claim
35 words
An optical recording medium prepared by laminating a plastic film on the recording surface of the reversible multi-color optical recording medium of claim 12 or the entire recording medium after thermal recording or optical recording.
Claim 17
Dependent Claim
28 words
An optical recording method wherein additional recording is made on the optical recording medium of claim 13 or 14 with flash light from a strobe or laser light.
Claim 18
Dependent Claim
25 words
A sheet for electronic photocopies comprising the reversible multi-color thermal recording medium of claim 6, or the reversible multi-color optical recording medium of claim 12.
Claim 19
Dependent Claim
180 words
A reversible multi-color thermal recording medium comprising an irreversible thermal composition recording layer containing a colorless or pale basic achromatic dye and an organic irreversible heat-resistant color developer as main components and a reversible multi-color thermal composition recording layer containing a colorless or pale basic achromatic dye and an organic reversible heat-resistant color developer as main components laminated on a support, wherein the reversible heat-resistant color developer is represented by the following formula (I'): ##STR17## wherein R is an alkyl group having 12 to 22 carbon atoms, A is selected from the group consisting of a lower alkyl group, lower alkoxy group, lower alkoxycarbonyl group, nitro group, halogen atom and hydrogen atom, and n is an integer of 1 to 3, and the irreversible heat-resistant color developer is represented by the following formula (II): ##STR18## wherein X is selected from the group consisting of a lower alkyl group having 1 to 4 carbon atoms, alkoxy group having 1 to 3 carbon atoms, hydrogen atom, nitro group, cyano group and halogen atom, and m is an integer of 1 to 3.
Claim 20
Dependent Claim
180 words
A reversible multi-color thermal recording medium comprising an irreversible thermal composition recording layer containing a colorless or pale basic achromatic dye and an organic irreversible heat-resistant color developer as main components and a reversible multi-color thermal composition recording layer containing a colorless or pale basic achromatic dye and an organic reversible heat-resistant color developer as main components laminated on a support, wherein the reversible heat-resistant color developer is represented by the following formula (I'): ##STR17## wherein R is an alkyl group having 12 to 22 carbon atoms, A is selected from the group consisting of a lower alkyl group, lower alkoxy group, lower alkoxycarbonyl group, nitro group, halogen atom and hydrogen atom, and n is an integer of 1 to 3, and the irreversible heat-resistant color developer is represented by the following formula (II): ##STR18## wherein X is selected from the group consisting of a lower alkyl group having 1 to 4 carbon atoms, alkoxy group having 1 to 3 carbon atoms, hydrogen atom, nitro group, cyano group and halogen atom, and m is an integer of 1 to 3.
Claim 21
Dependent Claim
35 words
A reversible multi-color thermal recording medium according to claim 17, wherein the irreversible thermal composition recording layer and the reversible thermal composition recording layer are laminated on said support with an intermediate layer interposed therebetween.
Claim 22
Dependent Claim
29 words
A reversible multi-color thermal recording medium according to claim 17 wherein in the formula II X is C 1 to C 4 alkyl and m is 1 or 2.
Claim 23
Dependent Claim
39 words
A reversible multi-color thermal recording medium according to claim 17 wherein in the formula II X is a member selected from the group consisting of Cl, Br, F, I, NO z and CN and m is 1 or 2.
Claim 24
Dependent Claim
30 words
A reversible multi-color thermal recording medium according to claim 17 wherein in the formula II X is C 1 to C 2 alkoxy group and m is 1 or 2.
Claim 25
Dependent Claim
34 words
A reversible multi-color thermal recording medium prepared by laminating a plastic film on the recorded surface of the reversible multi-color thermal recording medium of claim 17 or the entire recording medium after thermal recording.
Claim 26
Dependent Claim
33 words
A reversible multi-color optical recording medium which contains a light absorbent for absorbing light and converting it into heat in the recording layer of the reversible multi-color thermal recording medium of claim 17.
Claim 27
Dependent Claim
29 words
An optical recording medium prepared by laminating a plastic film on the recording surface of the reversible multi-color optical recording medium of claim 23 or the entire recording medium.
Claim 28
Dependent Claim
35 words
An optical recording medium prepared by laminating a plastic film on the recording surface of the reversible multi-color optical recording medium of claim 23 or the entire recording medium after thermal recording or optical recording.
Claim 29
Dependent Claim
28 words
An optical recording method wherein additional recording is made on the optical recording medium of claim 24 or 25 with flash light from a strobe or laser light.
Claim 30
Dependent Claim
25 words
A sheet for electronic photocopies comprising the reversible multi-color thermal recording medium of claim 17 or the reversible multi-color optical recording medium of claim 23.
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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) | 2001-01-19 | 2001-07-21 | 2002-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-01-19 | 2005-07-21 | 2006-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-01-19 | 2009-07-21 | 2010-01-20 | $7700.00 | Window Closed / Lapsed |