US4352860A
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Thermosensitive recording material
Assignee: Ricoh Co Ltd
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Filing: 1981-05-07
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Granted: 1982-10-05
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Expires: 2001-05-07
Abstract
Abstract A thermosensitive recording material comprising a support member and a thermosensitive layer formed on the support member, which thermosensitive layer contains a colorless or light-colored leuco dye and acidic material, capable of forming a color upon application of heat to the thermosensitive layer, and at least one amide compound selected from the group consisting of amide compounds represented by the formulas ##STR1## wherein R 1 represents an alkyl group with 1 to 30 carbon atoms, a phenyl group or a substituted phenyl group; R 2 represents hydrogen or an alkyl group with 1 to 4 carbon atoms; R 3 represents an alkyl group with 1 to 30 carbon atoms; R 4 and R 5 individually represent hydrogen, a halogen atom, an alkyl group with 1 to 4 carbon atoms or an alkoxy group with 1 to 4 carbon atoms; and n is an integer, 0 or 1, whereby image formation is improved with respect to the image density, the quantity of energy required for image formation, and thermal head operation on the thermosensitive recording material, and a compound represented by the formula ##STR2## wherein R 6 and R 7 individually represent an alkyl group with 10 to 30 carbon atoms, whereby prevention of discoloration of the recording material by pressure or friction is achieved.
Inventors
- 👤 Keishi Kubo
- 👤 Eiichi Kawamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:54
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: 27
Claim 1
Independent Claim
204 words
A thermosensitive recording material comprising a support member and a thermosensitive layer formed on said support member, said thermosensitive layer comprising a leuco dye and an acidic material capable of forming a color upon application of heat thereto, and at least one amide compound selected from the group consisting of an amide compound (1) represented by the formula (1) ##STR35## wherein R 1 represents an alkyl group with 1 to 30 carbon atoms, a phenyl group or a substituted phenyl group; and R 2 represents hydrogen or an alkyl group with 1 to 4 carbon atoms; an amide compound (2) represented by the formula (2) ##STR36## wherein R 1 represents an alkyl group with 1 to 30 carbon atoms, a phenyl group or a substituted phenyl group, and R 2 represents hydrogen or an alkyl group with 1 to 4 carbon atoms; and an amide compound (3) represented by the formula (3) ##STR37## wherein R 3 represents an alkyl group with 1 to 30 carbon atoms; R 4 and R 5 individually represent hydrogen, a halogen atom, an alkyl group with 1 to 4 carbon atoms or an alkoxy group with 1 to 4 carbon atoms; and n is an integer, 0 or 1.
Claim 2
Dependent Claim
204 words
A thermosensitive recording material comprising a support member and a thermosensitive layer formed on said support member, said thermosensitive layer comprising a leuco dye and an acidic material capable of forming a color upon application of heat thereto, and at least one amide compound selected from the group consisting of an amide compound (1) represented by the formula (1) ##STR35## wherein R 1 represents an alkyl group with 1 to 30 carbon atoms, a phenyl group or a substituted phenyl group; and R 2 represents hydrogen or an alkyl group with 1 to 4 carbon atoms; an amide compound (2) represented by the formula (2) ##STR36## wherein R 1 represents an alkyl group with 1 to 30 carbon atoms, a phenyl group or a substituted phenyl group, and R 2 represents hydrogen or an alkyl group with 1 to 4 carbon atoms; and an amide compound (3) represented by the formula (3) ##STR37## wherein R 3 represents an alkyl group with 1 to 30 carbon atoms; R 4 and R 5 individually represent hydrogen, a halogen atom, an alkyl group with 1 to 4 carbon atoms or an alkoxy group with 1 to 4 carbon atoms; and n is an integer, 0 or 1.
Claim 3
Dependent Claim
44 words
A thermosensitive recording material as claimed in claim 1, wherein the total amount of said amide compounds contained in said thermosensitive layer is in the range of 0.05 to 4.0 parts by weight with respect to one part by weight of said leuco dye.
Claim 4
Dependent Claim
16 words
A thermosensitive recording material as claimed in claim 1, wherein said amide compound (1) is N-stearylhexahydrobenzamide.
Claim 5
Dependent Claim
35 words
A thermosensitive recording material as claimed in claim 1, wherein said amide compound (2) is a compound selected from the group consisting of: N-cyclohexylacetamide N-cyclohexylpropionamide N-cyclohexylstearamide N-cyclohexylbenzamide N-cyclohexyl-2-methylbenzamide N-cyclohexyl-2-chlorobenzamide N-cyclohexyl-2,4-dimethylbenzamide N-cyclohexylpalmitamide N-(2-chlorocyclohexyl) palmitamide N-(2-methylcyclohexyl) stearamide
Claim 6
Dependent Claim
33 words
A thermosensitive recording material as claimed in claim 1, wherein said amide compound (3) is a compound selected from the group consisting of: N-stearylbenzamide N-palmityl-2-chlorobenzamide N-stearyl-2-methoxybenzamide N-stearyl-2-methylbenzamide N-stearyl-4-methylbenzamide N-palmityl-2,4-dimethylbenzamide N-behenylbenzamide N-behenyl-2-methylbenzamide N-stearylphenylacetamide N-behenylphenylacetamide
Claim 7
Dependent Claim
29 words
A thermosensitive recording material as claimed in claim 1, wherein said leuco dye is a colorless or light-colored dye compound selected from triphenylmethane dyes, fluoran dyes and lactone compounds.
Claim 8
Dependent Claim
54 words
A thermosensitive recording material as claimed in claim 1, wherein said acidic material is an organic acid which is selected from the group consisting of boric acid, oxalic acid, maleic acid, tartaric acid, citric acid, succinic acid, benzoic acid, steric acid, gallic acid, salicylic acid, 1-hydroxy-2-naphthoic acid, o-hydroxybenzoic acid, m-hydroxybenzoic acid and 2-hydroxy-p-toluic acid.
Claim 9
Dependent Claim
51 words
A thermosensitive recording material as claimed in claim 1, wherein said acidic material is a phenolic material which is selected from the group consisting of 3,5-xylenol, thymol, p-tert-butylphenyl, 4-hydroxyphenoxide, methyl-4-hydroxybenzoate, 4-hydroxyacetophenone, α-naphthol, β-naphthol, catechol, resorcin, hydroquinone, 4-tert-octylcatechol, 4,4'-sec-butylidenephenol, 2,2'-dihydroxydiphenyl, 2,2'-methylenebis(4-methyl-6-tert-butylphenol), 2,2'-bis(4'-hydroxyphenyl)propane (or bisphenol A), 4,4'-isopropylidenebis(2-tert-butylphenol), 4,4'-sec-butylidenediphenol, phyrogallol, phloroglucine and phlorogluocinocarboxylic acid.
Claim 10
Dependent Claim
41 words
A thermosensitive recording material as claimed in claim 1, wherein said thermosensitive layer further comprises a binder agent selected from the group consisting of water-soluble organic polymers and water emulsions of polystyrene, copolymer of vinyl chloride and vinyl acetate, or polybutylmethacrylate.
Claim 11
Dependent Claim
42 words
A thermosensitive recording material as claimed in claim 1, wherein said thermosensitive layer further comprises an additive for improvement of image quality, which additive is selected from the group consisting of calcium carbonate, silica, alumina, magnesia, talc, barium sulfate, and aluminum stearate.
Claim 12
Dependent Claim
37 words
A thermosensitive recording material as claimed in claim 1, wherein said thermosensitive layer further comprises a lubricating additive which is selected from the group consisting of linseed oil, tung oil, wax, paraffin, polyethylene wax, and chlorinated paraffin.
Claim 13
Dependent Claim
227 words
A thermosensitive recording material comprising a support member and a thermosensitive layer formed on said support member, said thermosensitive layer comprising a leuco dye and an acidic material, capable of forming a color upon application of heat thereto, a dicarboxylate compound represented by the formula ##STR38## wherein R 6 and R 7 individually represent an alkyl group with 10 to 30 carbon atoms, and at least one amide selected from the group consisting of: an amide compound (1) represented by the formula (1) ##STR39## wherein R 1 represents an alkyl group with 1 to 30 carbon atoms, a phenyl group or a substituted phenyl group; and R 2 represents hydrogen or an alkyl group with 1 to 4 carbon atoms; an amide compound (2) represented by the formula (2) ##STR40## wherein R 1 represents an alkyl group with 1 to 30 carbon atoms, a phenyl group or substituted phenyl group; and R 2 represents hydrogen or an alkyl group with 1 to 4 carbon atoms; and an amide compound (3) represented by the formula (3) ##STR41## wherein R 3 represents an alkyl group with 1 to 30 carbon atoms; R 4 and R 5 individually represent hydrogen, a halogen atom, an alkyl group with 1 to 4 carbon atoms or an alkoxy group with 1 to 4 carbon atoms; and n is an integer, 0 to 1.
Claim 14
Dependent Claim
227 words
A thermosensitive recording material comprising a support member and a thermosensitive layer formed on said support member, said thermosensitive layer comprising a leuco dye and an acidic material, capable of forming a color upon application of heat thereto, a dicarboxylate compound represented by the formula ##STR38## wherein R 6 and R 7 individually represent an alkyl group with 10 to 30 carbon atoms, and at least one amide selected from the group consisting of: an amide compound (1) represented by the formula (1) ##STR39## wherein R 1 represents an alkyl group with 1 to 30 carbon atoms, a phenyl group or a substituted phenyl group; and R 2 represents hydrogen or an alkyl group with 1 to 4 carbon atoms; an amide compound (2) represented by the formula (2) ##STR40## wherein R 1 represents an alkyl group with 1 to 30 carbon atoms, a phenyl group or substituted phenyl group; and R 2 represents hydrogen or an alkyl group with 1 to 4 carbon atoms; and an amide compound (3) represented by the formula (3) ##STR41## wherein R 3 represents an alkyl group with 1 to 30 carbon atoms; R 4 and R 5 individually represent hydrogen, a halogen atom, an alkyl group with 1 to 4 carbon atoms or an alkoxy group with 1 to 4 carbon atoms; and n is an integer, 0 to 1.
Claim 15
Dependent Claim
78 words
A thermosensitive recording material as claimed in claim 12, wherein the total amount of said amide compounds contained in said thermosensitive layer is in the range of 0.5 to 5 parts by weight with respect to one part by weight of said leuco dye, and the total amount of said dicarboxylate compound is in the range of 0.2 to 3 parts by weight with respect to one part by weight of the total amount of said amide compounds.
Claim 16
Dependent Claim
25 words
A thermosensitive recording material as claimed in claim 12, wherein said dicarboxylate compound is a compound selected from the group consisting of distearyl-4,5-epoxycyclohexene-1,2-dicarboxylate, and dibehenyl-4,5-epoxycyclohexene-1,2-dicarboxylate.
Claim 17
Dependent Claim
16 words
A thermosensitive recording material as claimed in claim 12, wherein said amide compound (1) is N-stearylhexahydrobenzamide.
Claim 18
Dependent Claim
35 words
A thermosensitive recording material as claimed in claim 12, wherein said amide compound (2) is a compound selected from the group consisting of: N-cyclohexylacetamide N-cyclohexylpropionamide N-cyclohexylstearamide N-cyclohexylbenzamide N-cyclohexyl-2-methylbenzamide N-cyclohexyl-2-chlorobenzamide N-cyclohexyl-2,4-dimethylbenzamide N-cyclohexylpalmitamide N-(2-chlorocyclohexyl) palmitamide N-(2-methylcyclohexyl) stearamide
Claim 19
Dependent Claim
33 words
A thermosensitive recording material as claimed in claim 12, wherein said amide compound (3) is a compound selected from the group consisting of N-stearylbenzamide N-palmityl-2-chlorobenzamide N-stearyl-2-methoxybenzamide N-stearyl-2-methylbenzamide N-stearyl-4-methylbenzamide N-palmityl-2,4-dimethylbenzamide N-behenylbenzamide N-behenyl-2-methylbenzamide N-stearylphenylacetamide N-behenylphenylacetamide
Claim 20
Dependent Claim
29 words
A thermosensitive recording material as claimed in claim 12, wherein said leuco dye is a colorless or light-colored dye compound selected from triphenylmethane dyes, fluoran dyes and lactone compounds.
Claim 21
Dependent Claim
54 words
A thermosensitive recording material as claimed in claim 12, wherein said acidic material is an organic acid which is selected from the group consisting of boric acid, oxalic acid, maleic acid, tartaric acid, citric acid, succinic acid, benzoic acid, steric acid, gallic acid, salicylic acid, 1-hydroxy-2-naphthoic acid, o-hydroxy-benzoic acid, m-hydroxybenzoic acid and 2-hydroxy-p-toluic acid.
Claim 22
Dependent Claim
51 words
A thermosensitive recording material as claimed in claim 12, wherein said acidic material is a phenolic material which is selected from the group consisting of 3,5-xylenol, thymol, p-tert-butylphenol, 4-hydroxyphenoxide, methyl-4-hydroxybenzonate, 4-hydroxyacetophenone, α-naphthol, β-naphthol, catechol, resorcin, hydroquinone, 4-tert-octylcatechol, 4,4'-sec-butylidenephenol, 2,2'-dihydroxydiphenyl, 2,2'-methylenebis(4-methyl-6-tert-butylphenol), 2,2'-bis(4'-hydroxyphenyl)propane (or bisphenol A), 4,4'-isopropylidenebis(2-tert-butylphenol), 4,4'-sec-butylidenediphenol, pyrogallol, phloroglucine and phlorogluocinocarboxylic acid.
Claim 23
Dependent Claim
41 words
A thermosensitive recording material as claimed in claim 12, wherein said thermosensitive layer further comprises a binder agent selected from the group consisting of water-soluble organic polymers and water emulsions of polystyrene, copolymer of vinyl chloride and vinyl acetate, or polybutylmethacrylate.
Claim 24
Dependent Claim
42 words
A thermosensitive recording material as claimed in claim 12, wherein said thermosensitive layer further comprises an additive for improvement of image quality, which additive is selected from the group consisting of calcium carbonate, silica, alumina, magnesia, talc, barium sulfate, and aluminum stearate.
Claim 25
Dependent Claim
37 words
A thermosensitive recording material as claimed in claim 12, wherein said thermosensitive layer further comprises a lubricating additive which is selected from the group consisting of linseed oil, tung oil, wax, paraffin, polyethylene wax, and chlorinated paraffin.
Claim 26
Dependent Claim
33 words
A thermosensitive recording material as claimed in claim 9, wherein the water-soluble organic polymers are selected from the group consisting of polyvinyl alcohol, methoxycellulose, hydroxyethylcellulose, carboxymethylcellulose, polyvinylpyrrolidone, polyacrylamide, polyacrylic acid, starch and gelatin.
Claim 27
Dependent Claim
33 words
A thermosensitive recording material as claimed in claim 21, wherein the water-soluble organic polymers are selected from the group consisting of polyvinyl alcohol, methoxycellulose, hydroxyethylcellulose, carboxymethylcellulose, polyvinylpyrrolidone, polyacrylamide, polyacrylic acid, starch and gelatin.
References Cited (Backward Citations)
US3859112A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-10-04 | 1986-04-05 | 1986-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-04 | 1990-04-05 | 1990-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-04 | 1994-04-05 | 1994-10-05 | $7700.00 | Window Closed / Lapsed |