US4097288A
Expired / Lapsed
US
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Heat sensitive recording composition containing a complexed phenolics and a spiropyran or leuco lactone
Assignee: Individual
•
Filing: 1977-02-25
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Granted: 1978-06-27
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Expires: 1997-02-25
Abstract
Abstract A heat-sensitive recording composition containing normally colorless lactones or spiropyran compounds in combination with hydrogen bonded molecular complexes of phenolic compounds having a dissociation temperature ranging from 50° to 220° C. The composition of the invention is less sensitive to pressure and less susceptible to background staining, image flooding, moisture sensitivity, odor, railroading and burnout problems as compared with compositions in which phenolic compounds are not complexed.
Inventors
- 👤 William R. Lawton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:21
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/50; B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/323; B41M5/333; B41M5/3333; B41M5/3335; Y; Y10; Y10S; Y10S428/00; Y10S428/913
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
114 words
A heat sensitive recording composition comprising a binder, a chromogenic compound reactive with a phenol at elevated temperatures to develop a color contrasting visibly with the normal color of said compound, said chromogenic compound being selected from the group consisting of lactone type leuco dyes and spiropyran type leuco dyes, and a hydrogen-bonded molecular complex of a phenol selected from Table III of the specification and a complexing agent selected from the group consisting of amines and amides, said complex being in stable, unreactive form below 50° C and dissociable into a phenol and an amine or amide by heating above a dissociation temperature in the range of from about 50° to 220° C.
Claim 2
Dependent Claim
114 words
A heat sensitive recording composition comprising a binder, a chromogenic compound reactive with a phenol at elevated temperatures to develop a color contrasting visibly with the normal color of said compound, said chromogenic compound being selected from the group consisting of lactone type leuco dyes and spiropyran type leuco dyes, and a hydrogen-bonded molecular complex of a phenol selected from Table III of the specification and a complexing agent selected from the group consisting of amines and amides, said complex being in stable, unreactive form below 50° C and dissociable into a phenol and an amine or amide by heating above a dissociation temperature in the range of from about 50° to 220° C.
Claim 3
Dependent Claim
16 words
The recording composition of claim 1, wherein said chromogenic compound comprises a lactone type leuco dye.
Claim 4
Dependent Claim
22 words
The recording composition of claim 2, wherein said lactone type leuco dye is a compound selected from Table I of the specification.
Claim 5
Dependent Claim
16 words
The recording composition of claim 1, wherein said chromogenic compound comprises a spiropyran type leuco dye.
Claim 6
Dependent Claim
22 words
The recording composition of claim 4, wherein said spiropyran type leuco dye is a compound selected from Table II of the specification.
Claim 7
Dependent Claim
24 words
The recording composition of claim 1, wherein said complexing agent is a compound selected from the amines listed in Table IV of the specification.
Claim 8
Dependent Claim
32 words
The recording composition of claim 1, wherein said chromogenic compound is a leuco dye selected from Table VI of the specification, and said complex comprises a combination of 2,2'-methylenebis (3,4,6-trichlorophenol) with cyclohexylamine.
Claim 9
Dependent Claim
44 words
The recording composition of claim 1, and further comprising an activator adapted to lower the temperature at which color is developed, said activator being a compound selected from the group consisting of ureas, thioureas, carbanilide, thiocarbanilide, zinc acetoacetonate, and fatty acid salts of zinc.
Claim 10
Independent Claim
174 words
A method for producing a recording composition sensitive to heat and insensitive to pressure, comprising the steps of combining a phenol selected from Table III of the specification with a complexing agent selected from the group comprising amines and amides to form a hydrogen - bonded molecular complex, combining in a mixture a chromogenic compound reactive with a phenol at elevated temperatures to develop a color contrasting with the normal color of said compound, said chromogenic compound being selected from the group consisting of lactone type leuco dyes and spiropyran type leuco dyes, and a hydrogen-bonded molecular complex of a phenol selected from Table III of the specification and a complexing agent selected from the group consisting of amines and amides, dissolving a binder in a solvent in which said complex is insoluble to form a binder-solvent solution, dispersing said mixture in the binder-solvent solution to form a dispersion, applying said dispersion to a substrate, and evaporating solvent from said dispersion to form a thermosensitive coating adapted to develop a color at elevated temperatures.
Claim 11
Independent Claim
174 words
A method for producing a recording composition sensitive to heat and insensitive to pressure, comprising the steps of combining a phenol selected from Table III of the specification with a complexing agent selected from the group comprising amines and amides to form a hydrogen - bonded molecular complex, combining in a mixture a chromogenic compound reactive with a phenol at elevated temperatures to develop a color contrasting with the normal color of said compound, said chromogenic compound being selected from the group consisting of lactone type leuco dyes and spiropyran type leuco dyes, and a hydrogen-bonded molecular complex of a phenol selected from Table III of the specification and a complexing agent selected from the group consisting of amines and amides, dissolving a binder in a solvent in which said complex is insoluble to form a binder-solvent solution, dispersing said mixture in the binder-solvent solution to form a dispersion, applying said dispersion to a substrate, and evaporating solvent from said dispersion to form a thermosensitive coating adapted to develop a color at elevated temperatures.
Claim 12
Dependent Claim
33 words
The method of claim 8, and further comprising the step of comminuting particles of the mixture to a diameter of less than 10 microns prior to dispersing said mixture in the binder-solvent solution.
Claim 13
Dependent Claim
114 words
A heat sensitive recording composition comprising a binder, a chromogenic compound reactive with a phenol at elevated temperatures to develop a color contrasting visibly with the normal color of said compound, said chromogenic compound being selected from the group consisting of lactone type leuco dyes and spiropyran type leuco dyes, and a hydrogen-bonded molecular complex of a phenol selected from Table IV of the specification and a complexing agent selected from the group consisting of amines and amides, said complex being in stable, unreactive form below 50° C and dissociable into a phenol and an amine or amide by heating above a dissociation temperature in the range of from about 50° to 220° C.
Claim 14
Dependent Claim
114 words
A heat sensitive recording composition comprising a binder, a chromogenic compound reactive with a phenol at elevated temperatures to develop a color contrasting visibly with the normal color of said compound, said chromogenic compound being selected from the group consisting of lactone type leuco dyes and spiropyran type leuco dyes, and a hydrogen-bonded molecular complex of a phenol selected from Table IV of the specification and a complexing agent selected from the group consisting of amines and amides, said complex being in stable, unreactive form below 50° C and dissociable into a phenol and an amine or amide by heating above a dissociation temperature in the range of from about 50° to 220° C.
Claim 15
Dependent Claim
24 words
The recording composition of claim 11, wherein said complexing agent is a compound selected from the amines listed in Table IV of the specification.
Claim 16
Dependent Claim
32 words
The recording composition of claim 1, wherein said chromogenic compound is Crystal Violet Lactone and said complex is selected from the group consisting of complexes listed in Table V of the specification.
References Cited (Backward Citations)
US2663654A
Cited
US3076707A
Cited
US3149991A
Cited
US3149992A
Cited
US3445261A
Cited
US3825432A
Cited
US3674535A
Cited
US3895173A
Cited
US3964911A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-26 | 1981-12-26 | 1982-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-26 | 1985-12-26 | 1986-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-26 | 1989-12-26 | 1990-06-27 | $7700.00 | Window Closed / Lapsed |