US4431706A
Expired / Lapsed
US
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Heat sensitive recording sheet
Assignee: Nippon Paper Industries Co Ltd
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Filing: 1982-01-26
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Granted: 1984-02-14
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Expires: 2002-01-26
Abstract
Abstract A heat sensitive recording sheet including dimethylterephthalate in its color-forming layer which contains a basic colorless or pale-colored chromogenic dyestuff and an organic color-developing agent whereby a heat sensitive recording sheet having a highly stable developed image against oily substances such as hair oil, sweat, etc. is provided without deteriorating the fundamental qualities of the heat sensitive recording sheet.
Inventors
- 👤 Masuhiko Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:13
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/337; B41M5/3375; Y; Y10; Y10S; Y10S428/00; Y10S428/913
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
33 words
Heat sensitive recording sheet with a color forming layer, characterized in that it comprises dimethyl 1,4-benzenedicarboxylate in said color-forming layer containing a basic colorless or pale-colored chromogenic dyestuff and an organic color-developing agent.
Claim 2
Dependent Claim
33 words
Heat sensitive recording sheet with a color forming layer, characterized in that it comprises dimethyl 1,4-benzenedicarboxylate in said color-forming layer containing a basic colorless or pale-colored chromogenic dyestuff and an organic color-developing agent.
Claim 3
Dependent Claim
19 words
Heat sensitive recording sheet according to claim 1, wherein said organic color-developing agent is at least one phenolic substance.
Claim 4
Dependent Claim
37 words
Heat sensitive recording sheet according to claim 2, wherein said phenolic substance is are at least one substance selected from a group consisting of bisphenol A (4,4'-isopropylidene diphenol), p,p'-(1-methylnormalhexylidene) diphenol, p-tertiary butylphenol, p-phenylphenol and Novolak phenolic resin.
Claim 5
Dependent Claim
19 words
Heat sensitive recording sheet according to claim 1, wherein said organic color-developing agent is at least one phenolic substance.
Claim 6
Dependent Claim
19 words
Heat sensitive recording sheet according to claim 4, wherein said organic acid is at least one p-Hydroxybenzoic acid ester.
Claim 7
Dependent Claim
45 words
Heat sensitive recording sheet according to claim 1, wherein said colorless or pale-colored chromogenic dyestuff is at least one substance selected from a group consisting of crystal violet lactone, 3-diethylamino-6-methyl-7-anilinofluoran, 3-(n-ethyl-p-toluidino)-6-methyl-7-anilinofluoran, 3-diethylamino-6-methyl-7-(o, p-dimethylanilino) fluoran, 3-pyrrolidino-6-methyl-7-anilino-fluoran, 3-piperidino-6-methyl-7-anilinofluoran, 3-(n-cyclohexyl-n-methylamino)-6-methyl-7-anilinofluoran, 3-diethylamino-7-(o-chloro-anilino) fluoran, 3-diethylamino-7-(m-trifluoromethylanilino) fluoran, 3-diethyl-amino-6-methylchlorofluoran, 3-diethyl-amino-6-methylfluoran and 3-cyclohexylamino-6-chlorofluoran.
Claim 8
Dependent Claim
58 words
Heat sensitive recording sheet according to claim 1, wherein said color-forming layer contains 3-10 parts by weight of said organic color-developing agent, 1-15 parts by weight of dimethyl 1,4-benzenedicarboxylate and 1-20 parts by weight of filler per 1 part by weight of a chromogenic dyestuff and 10-25 parts by weight of a binder per total solid content thereof.
Claim 9
Dependent Claim
14 words
Heat sensitive recording sheet according to claim 1, wherein said base sheet is paper.
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) | 1987-02-13 | 1987-08-15 | 1988-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-13 | 1991-08-15 | 1992-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-13 | 1995-08-15 | 1996-02-14 | $7700.00 | Window Closed / Lapsed |