US5079211A
Expired / Lapsed
US
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Heat sensitive recording material
Assignee: Mitsubishi Paper Mills Ltd
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Filing: 1989-10-11
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Granted: 1992-01-07
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Expires: 2009-10-11
Abstract
Abstract The present invention provides a heat sensitive recording material which is less in fog in background area and has superior color toning effect with high image storage stability which contain a fluoran compound represented by the following formula in addition to an aromatic isocyanate compound and an imino compound having at least one >C═NH group which forms color upon application of heat: ##STR1## wherein R 1 , R 2 and R 3 each represents a hydrogen atom, a lower alkyl group, a cyclohexyl group or an allyl group and R 4 and R 5 each represents a hydrogen atom, a lower alkyl group, a phenyl group, a cyclohexyl group or an aralkyl group. This heat sensitive recording material may further contain a heat fusible substance and/or a phenol compound to further improve heat responsivity or anti-fogging properties of background portion.
Inventors
- 👤 Yutaka Shimura
- 👤 Toshimitsu Nakajima
- 👤 Shigetoshi Hiraishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:28
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/323; B41M5/327; B41M5/3275; B41M5/333; B41M5/3333
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
101 words
A heat sensitive recording material comprising a support and provided thereon, a heat sensitive recording layer which contains an aromatic isocyanate compound, an imino compound which has at least one >C═NH group and reacts upon application of heat to form a color and a fluoran compound represented by the formula: ##STR4## where R 1 , R 2 and R 3 each represents a hydrogen atom, a lower alkyl group, a cyclohexyl group or a allyl group and R 4 and R 5 each represents a hydrogen atom, a lower alkyl group, a phenyl group, a cyclohexyl group or an aralkyl group.
Claim 2
Dependent Claim
101 words
A heat sensitive recording material comprising a support and provided thereon, a heat sensitive recording layer which contains an aromatic isocyanate compound, an imino compound which has at least one >C═NH group and reacts upon application of heat to form a color and a fluoran compound represented by the formula: ##STR4## where R 1 , R 2 and R 3 each represents a hydrogen atom, a lower alkyl group, a cyclohexyl group or a allyl group and R 4 and R 5 each represents a hydrogen atom, a lower alkyl group, a phenyl group, a cyclohexyl group or an aralkyl group.
Claim 3
Dependent Claim
51 words
A heat sensitive recording material according to claim 1, wherein R 1 and R 2 each represents a lower alkyl group, R 3 represents a hydrogen atom or a lower alkyl group and R 4 and R 5 each represents an aralkyl group in the formula which represents the fluoran compound.
Claim 4
Dependent Claim
28 words
A heat sensitive recording material according to claim 1, wherin the fluroran compound is contained in an amount of at least 0.5% by weight of the imino compound.
Claim 5
Dependent Claim
26 words
A heat sensitive recording material according to claim 3, wherein the fluoran compound is contained in an amount of 1-100% by weight of the imino compound.
Claim 6
Dependent Claim
16 words
A heat sensitive recording material according to claim 1, which additionally contains a heat fusible substance.
Claim 7
Dependent Claim
15 words
A heat sensitive recording material according to claim 1, which additionally contains a phenol compound.
Claim 8
Dependent Claim
31 words
A heat sensitive recording material according to claim 1, wherein the fluoran is selected from the group consisting of 3-diethylamino-5-methyl-7-dibenzylaminofluoran, 3-diethylamino-7-dibenzylaminofluoran, 3-N-ethyl-N-cyclohexylamino-7-anilinofluoran, 3-N-ethyl-N-(p-methylphenyl)amino-7-(N'-methyl-N'phenylamino) fluoran, 3-pyrrolidyl-7-cyclohexylaminofluoran, 3-diethylamino-7-anilinofluoran, 3-N-ethyl-N-p-methylphenylamino-7anilinofluoran, 3-diethylamino-7-p-cyclohexylanilinofluoran, 3-diethylamino-7-(N-cyclohexyl-N-benzylamino)fluoran, and 3-cyclohexylamino-7-(N-methyl-N-p-methylphenylamino)-fluoran.
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) | 1995-01-06 | 1995-07-08 | 1996-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-06 | 1999-07-08 | 2000-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-06 | 2003-07-08 | 2004-01-07 | $7700.00 | Window Closed / Lapsed |