US4721701A
Expired / Lapsed
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Thermosensitive recording sheet
Assignee: Nippon Paper Industries Co Ltd
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Filing: 1985-12-30
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Granted: 1988-01-26
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Expires: 2005-12-30
Abstract
Abstract A thermosensitive recording sheet having a thermosensitive color developing layer containing a basic leuco dye and an organic color developer, said organic color developer consisting of at least partly of a halogen-substituted benzoic acid zinc salt represented by the following general formula <IMAGE> (I) wherein X1 represents a halogen atom, X2 represents a hydrogen or halogen atom, and R1, R2 and R3, independently from each other, represent a hydrogen atom or an alkyl, alkoxy, cycloalkyl, nitro, cyano or hydroxyl group.
Inventors
- 👤 Toshimi Satake
- 👤 Toshiaki Minami
- 👤 Tomoaki Nagai
- 👤 Fumio Fujimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:19
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/333; B41M5/3333; B41M5/3335
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
56 words
A thermosensitive recording sheet having a thermosensitive color developing layer containing a basic leuco dye and an organic color developer, said organic color developer consisting at least partly of a halogen-substituted benzoic acid zinc salt wherein the halogen-substituted benzoic acid zinc salt is selected from the group consisting of zinc p-chlorobenzoate, zinc m-chlorobenzoate and zinc 3,4-dichlorobenzoate.
Claim 2
Dependent Claim
56 words
A thermosensitive recording sheet having a thermosensitive color developing layer containing a basic leuco dye and an organic color developer, said organic color developer consisting at least partly of a halogen-substituted benzoic acid zinc salt wherein the halogen-substituted benzoic acid zinc salt is selected from the group consisting of zinc p-chlorobenzoate, zinc m-chlorobenzoate and zinc 3,4-dichlorobenzoate.
Claim 3
Dependent Claim
37 words
The thermosensitive recording sheet of claim 1 wherein the thermosensitive color developing layers contains the organic color developer in an amount of 0.1 to 5 parts by weight per part by weight of the basic leuco dye.
Claim 4
Dependent Claim
22 words
The thermosensitive recording sheet of claim 1 wherein the basic leuco dye is selected from triphenylmethane-type dyes, fluorane-type dyes and azaphthalide-type dyes.
Claim 5
Dependent Claim
19 words
The thermosensitive recording sheet of claim 3 wherein the basic leuco dye is a mixture of 3-diethylamino-6-methyl-7-anilinofluorane and 3-(N-cyclohexyl-N-methylamino)-6-methyl-7-anilinofluorane.
Claim 6
Dependent Claim
20 words
The thermosensitive recording sheet of claim 1 wherein the basic leuco dye is selected from 3-diethylamino-6-methyl-7-anilinofluorane, 3-(N-cyclohexyl-N-methylamino)-6-methyl-7-anilinofluorane, 3-(N-ethyl-N-isoamyl)amino-6-methyl-7-anilinofluorane and 3-(4-diethylamino-2-ethoxyphenyl)-3-(1-ethyl-2-methylindol-3-yl)-4-azaphthalide.
Claim 7
Dependent Claim
32 words
The thermosensitive recording sheet of claim 1 wherein the basic leuco dye is a combination of a fluorene-type leuco dye and a a fluorane-type leuco dye capable of forming a black color.
Claim 8
Dependent Claim
50 words
The thermosensitive recording sheet of claim 6 wherein the fluorene-type leuco dye is a leuco dye represented by the following general formula ##STR7## wherein R 11 , R 12 , R 13 , R 14 , R 15 and R 16 , independently from each other, represent an alkyl group.
Claim 9
Dependent Claim
26 words
The thermosensitive recording sheet of claim 6 wherein the fluorane-type leuco dye is selected from 3-diethylamino-6-methyl-7-anilinofluorane, 3-(N-ethyl-p-toluidino)-6-methyl-7-anilinofluorane, 3-(N-ethyl-N-isoamyl)amino-6-methyl-7-anilinofluorane, 3-diethylamino-6-methyl-7-(o,p-dimethylanilino)fluorane, 3-pyrrolidino-6-methyl-7-anilinofluorane, 3-piperidino-6-methyl-7-anilinofluorane, 3-(N-cyclohexyl-N-methylamino)-6-methyl-7-anilinofluorane, 3-diethylamino-7-(m-trifluoromethylanilino)fluorane, 3-dibutylamino-7-(o-chloroanilino)fluorane, and 3-diethylamino-7-(o-chloroanilino)fluorane.
Claim 10
Dependent Claim
17 words
The thermosensitive recording sheet of claim 1 wherein the thermosensitive color developing layer further comprises a sensitizer.
Claim 11
Dependent Claim
115 words
A thermosensitive recording sheet having a thermosensitive color developing layer containing a basic leuco dye, a sensitizer, and and organic color developer consisting at least partly of a halogen-substituted benzoic acid zinc salt represented by the following general formula ##STR8## wherein X 1 represents a halogen atom, X 2 represents a hydrogen or halogen atom, and R 1 , R 2 and R 3 , independently from each other, represent a hydrogen atom or an alkyl, alkoxy, cycloalkyl, nitro, cyano or hydroxyl group wherein the sensitizer is a naphthyl ether represented by the following formula ##STR9## wherein R 17 and R 18 , independently from each other, represent an alkyl, cycloalkyl, phenyl or benzyl group.
Claim 12
Dependent Claim
115 words
A thermosensitive recording sheet having a thermosensitive color developing layer containing a basic leuco dye, a sensitizer, and and organic color developer consisting at least partly of a halogen-substituted benzoic acid zinc salt represented by the following general formula ##STR8## wherein X 1 represents a halogen atom, X 2 represents a hydrogen or halogen atom, and R 1 , R 2 and R 3 , independently from each other, represent a hydrogen atom or an alkyl, alkoxy, cycloalkyl, nitro, cyano or hydroxyl group wherein the sensitizer is a naphthyl ether represented by the following formula ##STR9## wherein R 17 and R 18 , independently from each other, represent an alkyl, cycloalkyl, phenyl or benzyl group.
Claim 13
Dependent Claim
29 words
The thermosensitive recording sheet of claim 10 wherein the sensitizer is included in an amount of 0.5 to 6 parts by weight per part by weight of the dye.
Claim 14
Dependent Claim
22 words
The thermosensitive recording sheet of claim 10 wherein the halogen-substituted benzoic acid zinc salt is zinc p-chlorobenzoate, zinc m-chlorobenzoate or zinc 3,4-dichlorobenzoate.
Claim 15
Dependent Claim
37 words
The thermosensitive recording sheet of claim 10 wherein the thermosensitive color developing layer contains the organic color developer in an amount of 0.1 to 5 parts by weight per part by weight of the basic leuco dye.
Claim 16
Dependent Claim
22 words
The thermosensitive recording sheet of claim 10 wherein the basic leuco dye is selected from triphenylmethane-type dyes, fluorane-type dyes and azaphthalide-type dyes.
Claim 17
Dependent Claim
20 words
The thermosensitive recording sheet of claim 10 wherein the basic leuco dye is selected from 3-diethylamine-6-methyl-7-anilinofluorane, 3-(N-cyclohexyl-N-methylamine)-6-methyl-7-anilinofluorane, 3-(N-ethyl-N-isoamyl)-amino-6-methyl-7-anilinofluorane and 3-(4-diethylamine-2-ethoxyphenyl)-3-(1-ethyl-2-methylindol-3-yl)-4-azaphthalide.
Claim 18
Dependent Claim
19 words
The thermosensitive recording sheet of claim 15 wherein the basic leuco dye is a mixture of 3-diethylamino-6-methyl-7-anilinofluorane and 3-(N-cyclohexyl-N-methylamino)-6-methyl-7-anilinofluorane.
Claim 19
Dependent Claim
30 words
The thermosensitive recording sheet of claim 10 wherein the basic leuco dye is a combination of fluorene-type leuco dye and a fluorane-type leuco dye capable of forming a black color.
Claim 20
Dependent Claim
42 words
The thermosensitive recording sheet of claim 17 wherein the fluorene-type leuco dye is a leuco dye represented by the following general formula ##STR10## wherein R 17 and R 18 , independently from each other, represent an alkyl, cycloalkyl, phenyl or benzyl group.
Claim 21
Dependent Claim
29 words
The thermosensitive recording sheet of claim 17 wherein the sensitizer is included in an amount of 0.5 to 6 parts by weight per part by weight of the dye.
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) | 1991-01-25 | 1991-07-27 | 1992-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-25 | 1995-07-27 | 1996-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-25 | 1999-07-27 | 2000-01-26 | $7700.00 | Window Closed / Lapsed |