US4467339A
Expired / Lapsed
US
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Thermosensitive recording material
Assignee: Ricoh Co Ltd
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Filing: 1982-06-04
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Granted: 1984-08-21
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Expires: 2002-06-04
Abstract
Abstract An improved thermosensitive recording material comprising a support material is disclosed and a thermosensitive coloring layer formed on the support material, the thermosensitive coloring layer comprising (a) a colorless or light-colored coloring material and (b) a developing material capable of coloring the coloring material upon application of heat thereto, said developing material comprising a p-hydroxybenzoic acid ester of the formula (I) and a bisphenol derivative of the formula (II), with a melting point ranging from 80° C. to 130° C., the formulas (I) and (II) being: ##STR1## wherein R represents alkyl having 1 to 4 carbon atoms, or benzyl, ##STR2## wherein R 1 represents hydrogen or methyl; R 2 represents hydrogen or alkyl having 1 to 5 carbon atoms; R 3 represents hydrogen or methyl; and R 4 represents hydrogen or alkyl having 1 to 4 carbon atoms.
Inventors
- 👤 Shinichi Asami
- 👤 Hiroshi Sakamoto
- 👤 Norihiko Inaba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:43
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/323; B41M5/327; B41M5/333; B41M5/3333; B41M5/3335; B41M5/3275
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
96 words
A thermosensitive recording material comprising a support and a thermosensitive coloring layer formed on said support, said thermosensitive coloring layer comprising a colorless or light-colored coloring material and a developing material capable of developing the color of said coloring material upon application of heat to said thermosensitive coloring layer, wherein the improvement comprises: said developing material consists essentially of (i) at least one p-hydroxybenzoic acid ester of the formula: ##STR15## wherein R represents alkyl having 1 to 4 carbon atoms or benzyl, and (ii) at least one bisphenol derivative selected from the group consisting of: ##STR16##
Claim 2
Dependent Claim
96 words
A thermosensitive recording material comprising a support and a thermosensitive coloring layer formed on said support, said thermosensitive coloring layer comprising a colorless or light-colored coloring material and a developing material capable of developing the color of said coloring material upon application of heat to said thermosensitive coloring layer, wherein the improvement comprises: said developing material consists essentially of (i) at least one p-hydroxybenzoic acid ester of the formula: ##STR15## wherein R represents alkyl having 1 to 4 carbon atoms or benzyl, and (ii) at least one bisphenol derivative selected from the group consisting of: ##STR16##
Claim 3
Dependent Claim
36 words
A thermosensitive recording material as claimed in claim 1 wherein the amount of said developing material is in the range of 1 to 10 parts by weight to 1 part by weight of said coloring material.
Claim 4
Dependent Claim
30 words
A thermosensitive recording material as claimed in claim 2, wherein the weight ratio of said p-hydroxybenzoic acid ester to said bisphenol derivative is in the range of 0.1 to 5.
Claim 5
Dependent Claim
39 words
A thermosensitive recording material as claimed in claim 1, wherein said coloring material is a leuco compound selected from the group consisting of triphenylmethane-type leuco compounds, fluoran-type leuco compounds, phenothiazine-type leuco compounds, auramine-type leuco compounds and spiropyran-type leuco compounds.
Claim 6
Dependent Claim
34 words
A thermosensitive recording material as claimed in claim 1, wherein said p-hydroxybenzoic acid ester is selected from the group consisting of methyl p-hydroxybenzoate, ethyl p-hydroxybenzoate, n-propyl p-hydroxybenzoate, iso-propyl p-hydroxybenzoate, iso-butyl p-hydroxybenzoate, and benzyl p-hydroxybenzoate.
Claim 7
Dependent Claim
20 words
A thermosensitive recording material as claimed in claim 1, wherein said p-hydroxybenzoic acid ester is ethyl p-hydroxybenzoate or benzyl p-hydroxybenzoate.
Claim 8
Dependent Claim
60 words
A thermosensitive recording material as claimed in claim 1, wherein said thermosensitive layer further contains an effective amount of at least one additive selected from the group consisting of (1) a binder, (2) a pigment selected from the group consisting of calcium carbonate, calcium stearate, clay, talc, zinc oxide, polystyrene and urea-formaldehyde resin, (3) a wax, and (4) mixtures thereof.
Claim 9
Dependent Claim
31 words
A thermosensitive recording material as claimed in claim 7, wherein said additive consists of a mixture of polyvinyl alcohol, as said binder, and calcium carbonate and calcium stearate, as said pigment.
Claim 10
Dependent Claim
152 words
A thermosensitive recording material comprising a support and a thermosensitive coloring layer formed on said support, said thermosensitive coloring layer consisting essentially of (1) a colorless or light-colored coloring material, (2) 1 to 10 parts by weight, per 1 part by weight of said coloring material, of a developing material capable of developing the color of said coloring material upon application of heat to said thermosensitive coloring layer, said developing material consisting essentially of (i) at least one p-hydroxybenzoic acid ester of the formula: ##STR17## wherein R represents alkyl having 1 to 4 carbon atoms or benzyl, and (ii) at least one bisphenol derivative selected from the group consisting of: ##STR18## wherein the weight ratio of (i) to (ii) is in the range of 0.1 to 5, (3) a pigment selected from the group consisting of calcium carbonate, calcium stearate, clay, talc, zinc oxide, polystyrene and urea-formaldehyde resin, and (4) a binder.
Claim 11
Dependent Claim
152 words
A thermosensitive recording material comprising a support and a thermosensitive coloring layer formed on said support, said thermosensitive coloring layer consisting essentially of (1) a colorless or light-colored coloring material, (2) 1 to 10 parts by weight, per 1 part by weight of said coloring material, of a developing material capable of developing the color of said coloring material upon application of heat to said thermosensitive coloring layer, said developing material consisting essentially of (i) at least one p-hydroxybenzoic acid ester of the formula: ##STR17## wherein R represents alkyl having 1 to 4 carbon atoms or benzyl, and (ii) at least one bisphenol derivative selected from the group consisting of: ##STR18## wherein the weight ratio of (i) to (ii) is in the range of 0.1 to 5, (3) a pigment selected from the group consisting of calcium carbonate, calcium stearate, clay, talc, zinc oxide, polystyrene and urea-formaldehyde resin, and (4) a binder.
Claim 12
Dependent Claim
168 words
A thermosensitive recording material as claimed in claim 9, wherein said coloring material is selected from the group consisting of triphenylmethane-type leuco compounds of the general formula: ##STR19## wherein Rx, Ry and Rz each represent hydrogen, hydroxyl, halogen, alkyl, nitro, amino, dialkylamino, monoalkylamino or aryl, and lactone compounds of the general formula: ##STR20## wherein R 1 and R 2 each represent hydrogen, lower alkyl, substituted or unsubstituted aralkyl, substituted or unsubstituted phenyl, cyanoethyl, or β-halogenated ethyl, or R 1 and R 2 in combination represent --CH 2 -- 4 , --CH 2 -- 5 , or --CH 2 -- 2 O--CH 2 -- 2 , R 3 and R 4 each represent hydrogen, lower alkyl, amino or phenyl, and one of R 3 or R 4 is hydrogen, X 1 , X 2 and X 3 each represent hydrogen, lower alkyl, lower alkoxy, halogen, halogenated methyl, nitro, or substituted or unsubstituted amino, X 4 represents hydrogen, halogen or lower alkyl, and n is an integer 0 to 4.
Claim 13
Dependent Claim
45 words
A thermosensitive recording material as claimed in claim 9, wherein said coloring material is selected from the group consisting of fluoran-type leuco compounds of the general formula ##STR21## wherein Rx, Ry and Rz are each hydrogen, hydroxyl, halogen, alkyl, nitro, amino, dialkylamino, monoalkylamino or aryl.
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) | 1987-08-21 | 1988-02-20 | 1988-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-21 | 1992-02-20 | 1992-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-21 | 1996-02-20 | 1996-08-21 | $7700.00 | Window Closed / Lapsed |