US4020232A
Expired / Lapsed
US
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Heat-sensitive recording sheets
Assignee: Mitsubishi Paper Mills Ltd
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Filing: 1975-05-14
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Granted: 1977-04-26
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Expires: 1995-05-14
Abstract
Abstract This invention discloses a heat-sensitive recording sheet which comprises a support and, coated thereon, a heat-sensitive composition containing an organic base and at least one acylated lactone or sultone type acidic leuco dye capable of forming a color by reaction with said organic base at an elevated temperature. The invention further discloses as one embodiment a multicolor heat-sensitive recording sheet prepared by adding to the above-mentioned chromogenic system a chromogenic system comprising a normally solid phenolic substance and at least one basic chromogenic substance capable of forming a color by reaction with said phenolic substance at an elevated temperature. Preferable examples of the above-mentioned leuco dye are acrylated xanthene lactone type leuco dyes.
Inventors
- 👤 Isao Kohmura
- 👤 Kiyoshi Futaki
- 👤 Kozo Haino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:05
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/34; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S428/914
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
49 words
A heat sensitive recording sheet which comprises a support and a heat sensitive composition coated thereon which comprises a solid amine derivative and at least one acylated lactone or sultone type acidic leuco dye capable of reacting with said amine derivative at an elevated temperature to form a color.
Claim 2
Dependent Claim
49 words
A heat sensitive recording sheet which comprises a support and a heat sensitive composition coated thereon which comprises a solid amine derivative and at least one acylated lactone or sultone type acidic leuco dye capable of reacting with said amine derivative at an elevated temperature to form a color.
Claim 3
Dependent Claim
78 words
A heat sensitive recording sheet according to claim 1, wherein the heat sensitive composition additionally contains a phenolic substance which is solid at normal temperature and different from said acidic leuco dye and at least one basic chromogenic substance different from said amine derivative and capable of reacting with said phenolic substance at an elevated temperature to form a color, said amine derivative melting at a temperature higher or having a melting speed lower than said phenolic substance.
Claim 4
Dependent Claim
26 words
A heat sensitive recording sheet according to claim 1, wherein the acylated dye is an acylated xanthene or triphenylmethane lactone or sultone type acidic leuco dye.
Claim 5
Dependent Claim
22 words
A heat sensitive recording sheet according to claim 3, wherein the acylated dye is an acylated xanthene lactone type acidic leuco dye.
Claim 6
Dependent Claim
21 words
A heat sensitive recording sheet according to claim 2, wherein the heat sensitive composition is coated in at least one layer.
Claim 7
Dependent Claim
30 words
A heat sensitive recording sheet according to claim 2, wherein the basic chromogenic substance is selected from the group consisting of lactone, sultone, lactam and spiropyran type basic chromogenic substance.
Claim 8
Dependent Claim
17 words
A heat sensitive recording sheet according to claim 1, wherein the amine derivative is a guanidine derivative.
Claim 9
Dependent Claim
17 words
A heat sensitive recording sheet according to claim 4, wherein the xanthene dye is difficultly water soluble.
Claim 10
Dependent Claim
21 words
A heat sensitive recording sheet according to claim 2, wherein amount of the amine derivative is 10-900% of the phenolic substance.
Claim 11
Dependent Claim
30 words
A heat sensitive recording sheet according to claim 1, wherein the mixing ratio of the amine derivative to the acylated leuco dye is 1 : 1 - 1 : 50.
Claim 12
Dependent Claim
30 words
A heat sensitive recording sheet according to claim 2, wherein the mixing ratio of the phenolic substance to the basic chromogenic substance is 1 : 1 - 1 : 20.
Claim 13
Dependent Claim
20 words
A heat sensitive recording sheet according to claim 1, wherein the amine derivative has a melting point above 60° C.
Claim 14
Dependent Claim
156 words
A heat sensitive recording sheet according to claim 12, wherein the amine derivative has one of the formulae: ##STR94## wherein: R 1 , R 2 , R 3 , R 4 and R 5 individually are hydrogen, alkyl having not over 18 carbon atoms, cycloalkyl, aryl, aralkyl, amino, alkylamino, acylamino, carbamoylamino, amidino, cyano or a heterocyclic, R 6 is lower alkylene, phenylene, naphthylene or ##STR95## where X is lower alkylene, SO 2 , S 2 , S, O, --NH-- or a single bond and where the aryl can be substituted by lower alkyl, alkoxy, nitro, acylamino, alkylamino or halogen and R 7 , r 8 and R 9 individually are hydrogen, alkyl of not over 18 carbon atoms, aminoalkyl, cycloalkyl, aralkyl or heterocyclic or at least two of R 7 , R 8 and R 9 bond to each other at a position other than N in the formula to form a ring together with N.
Claim 15
Dependent Claim
46 words
A heat sensitive recording sheet according to claim 13, wherein the phenolic substance is 4,4'-isopropylidene diphenol, 4,4'-isopropylidene bis(2-chlorophenol), 4,4'-isopropylidene bis(2-tert-butylphenol), 4,4'-sec-butylidenediphenol, 4,4'-(1-methyl-n-hexylidene)diphenol, 4-phenylphenol, 4-hydroxydiphenoxide, methyl-4-hydroxybenzoate, phenyl-4-hydroxybenzoate, 4-hydroxyacetophenol, salicylanilide, 4,4'-cyclohexylidenediphenol, 4,4'-cyclohexylidene bis(2-methylphenol), 4,4'-benzylidenediphenol, 4,4'-thio bis(6-tert-butyl-3-methylphenol), novalak type phenol resin, halogenated novolak type phenol resin, α-naphthol or β-naphthol.
Claim 16
Dependent Claim
37 words
A heat sensitive recording sheet according to claim 1 also comprising a phenolic substance solid at room temperature and different from said acidic leuco dye said amine derivative and said phenolic substance being in separate coating layers.
Claim 17
Dependent Claim
19 words
A heat sensitive recording sheet according to claim 15 wherein said separate coating layers are adjacent to each other.
Claim 18
Dependent Claim
74 words
A heat sensitive recording sheet according to claim 13 wherein the amine derivative has the formula ##STR96## wherein R 7 , R 8 and R 9 individually are hydrogen, alkyl of not over 18 carbon atoms, aminoalkyl, cycloalkyl, aralkyl or heterocyclic or at least two of R 7 , R 8 and R 9 bond to each other at a position other than N in the formula to form a ring together. with N.
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) | 1980-04-25 | 1980-10-25 | 1981-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-25 | 1984-10-25 | 1985-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-25 | 1988-10-25 | 1989-04-26 | $7700.00 | Window Closed / Lapsed |