Patent US4630080A successfully refreshed from Google Patents.
US4630080A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-sensitive recording sheet
Assignee: Nippon Paper Industries Co Ltd
•
Filing: 1985-11-06
•
Granted: 1986-12-16
•
Expires: 2005-11-06
Abstract
Abstract A heat-sensitive recording sheet comprising both calcium monobenzyl phthalate as stabilizer and 4-isopropoxy-4'-hydroxy diphenylsulfone and/or 4-methyl-4'-hydroxy diphenylsulfone as organic developer in heat-sensitive layer which comprises a basic colorless dyestuff and an organic developer. This heat-sensitive recording sheet provides the improved stability of developed color image against sticking of hair tonics and oils, etc.
Inventors
- 👤 Toshimi Satake
- 👤 Yoshihide Kimura
- 👤 Toshiaki Minami
- 👤 Fumio Fujimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:56
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/333; B41M5/3333; B41M5/3335; B41M5/3336; B41M5/337; B41M5/3377
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
91 words
A heat-sensitive recording sheet which comprises a support and a heat sensitive color-developing layer on at least one surface of said support, said heat-sensitive color layer containing a basic color-less dye and an organic developer as main components, characterized by comprising both calcium monobenzyl phthalate of the following general formula (III) as stabilizer and at least a compound selected from the group consisting of 4-isopropoxy-4'-hydroxy diphenylsulfone of the following general formula (I) and 4-methyl-4'-hydroxy diphenylsulfone of the following general formula (II) as said organic developer in said heat-sensitive coloring layer: ##STR4##
Claim 2
Dependent Claim
91 words
A heat-sensitive recording sheet which comprises a support and a heat sensitive color-developing layer on at least one surface of said support, said heat-sensitive color layer containing a basic color-less dye and an organic developer as main components, characterized by comprising both calcium monobenzyl phthalate of the following general formula (III) as stabilizer and at least a compound selected from the group consisting of 4-isopropoxy-4'-hydroxy diphenylsulfone of the following general formula (I) and 4-methyl-4'-hydroxy diphenylsulfone of the following general formula (II) as said organic developer in said heat-sensitive coloring layer: ##STR4##
Claim 3
Dependent Claim
31 words
A heat-sensitive recording sheet according to claim 1, wherein said calcium monobenzyl phthalate is added in an amount ranging from 10 to 60 wt % with respect to said organic developer.
Claim 4
Dependent Claim
34 words
A heat-sensitive recording sheet according to claim 1, wherein said basic colorless dye is at least a member selected from the group consisting of triphenylmethane leuco dye, fluoran leuco dyes and azaphthalide leuco dye.
Claim 5
Dependent Claim
31 words
A heat-sensitive recording sheet according to claim 1 or 3, wherein said basic colorless dye is at least a compound selected from the group consisting of 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-methylindole-3-yl)-4-azaphthalide.
Claim 6
Dependent Claim
49 words
A heat-sensitive recording sheet according to claim 1, wherein said color-developing layer comprises 3-12 parts of 4-isopropoxy-4'-hydroxy diphenylsulfone, 1-4 parts of calcium monobenzyl phthalate and 1-20 parts of the filler per one part of said colorless basic dye, and 10-25 parts of the binder for the total solid content.
Claim 7
Dependent Claim
49 words
A heat-sensitive recording sheet according to claim 1, wherein said color-developing layer comprises 3-12 parts of 4-methyl-4'-hydroxy diphenylsulfone, 3-12 parts of calcium monobenzyl phthalate and 1-20 parts of the filler per one part of said colorless basic dye, and 10-25 parts of the binder for the total solid content.
Claim 8
Dependent Claim
17 words
A heat-sensitive recording sheet according to claim 1, wherein said color-developing layer further comprises an additional sensitizer.
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) | 1989-12-15 | 1990-06-16 | 1990-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-15 | 1994-06-16 | 1994-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-15 | 1998-06-16 | 1998-12-16 | $7700.00 | Window Closed / Lapsed |