US4626877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-sensitive recording material
Assignee: New Oji Paper Co Ltd
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Filing: 1985-10-24
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Granted: 1986-12-02
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Expires: 2005-10-24
Abstract
Abstract This invention provides a heat-sensitive recording material comprising a base sheet and a heat-sensitive record layer formed over the base sheet and containing a color forming material and a color developing material which undergoes a color forming reaction on contact with the color forming material, the heat-sensitive recording material being characterized in that a resin layer containing a cationic-modified starch is formed over the heat-sensitive record layer. The resin-coated heat-sensitive recording material of the invention is free of sticking, and resistant to diazo developer and suppresses the powder-coated phenomenon due to the bleeding of crystallized color forming material, color developing material and the like.
Inventors
- 👤 Naoto Arai
- 👤 Tohru Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:59
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/40; B41M5/42; B41M5/44; B41M5/426
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
64 words
A heat-sensitive recording material comprising a base sheet and a heat-sensitive record layer formed over the base sheet and containing a color forming material and a color developing material which undergoes a color forming reaction on contact with the color forming material, the heat-sensitive recording material being characterized in that a resin layer containing a cationic-modified starch is formed over the heat-sensitive record layer.
Claim 2
Dependent Claim
64 words
A heat-sensitive recording material comprising a base sheet and a heat-sensitive record layer formed over the base sheet and containing a color forming material and a color developing material which undergoes a color forming reaction on contact with the color forming material, the heat-sensitive recording material being characterized in that a resin layer containing a cationic-modified starch is formed over the heat-sensitive record layer.
Claim 3
Dependent Claim
58 words
A heat-sensitive recording material as defined in claim 1 wherein the cationic-modified starch is one which is prepared by modifying starch with a primary, secondary or tertiary amine, or quaternary ammonium, and which is capable of producing a uniform and smooth layer when applied to the heat-sensitive record layer in the form of an aqueous solution and dried.
Claim 4
Dependent Claim
102 words
A heat-sensitive recording material as defined in claim 1 wherein the cationic-modified starch is one prepared by modifying starch with ethylene imine, halogenated alkylamine represented by the formula ##STR5## wherein R 1 and R 2 are each hydrogen atom or alkyl having 1 to 5 carbon atoms, X is halogen atom and n is an integer of 1 to 3, or epoxyalkyltrialkyl ammonium salt represented by the formula ##STR6## wherein R 3 , R 4 and R 5 are each alkyl having 1 to 5 carbon atoms or benzyl, X is halogen atom, and m is an integer of 1 or 2.
Claim 5
Dependent Claim
24 words
A heat-sensitive recording material as defined in claim 1 wherein the cationic-modified starch has a degree of substitution of about 0.005 to about 0.10.
Claim 6
Dependent Claim
55 words
A heat-sensitive recording material as defined in claim 1 wherein the cationic-modified starch is one prepared by modifying starch with halogenated alkylamine represented by the formula ##STR7## wherein R 1a and R 2a are each alkyl having 1 to 5 carbon atoms, X is halogen atom, and n is an integer of 1 to 3.
Claim 7
Dependent Claim
58 words
A heat-sensitive recording material as defined in claim 1 wherein the cationic-modified starch is one prepared by modifying starch with epoxyalkyltrialkylammonium salt represented by the formula ##STR8## wherein R 3a , R 4a and R 5a are each alkyl having 1 to 5 carbon atoms, X is halogen atom, and m is an integer of 1 or 2.
Claim 8
Dependent Claim
17 words
A heat-sensitive recording material as defined in claim 1 wherein the resin layer further contains a pigment.
Claim 9
Dependent Claim
19 words
A heat-sensitive recording material as defined in claim 1 wherein the resin layer further contains a cross linking agent.
References Cited (Backward Citations)
US4420538A
Cited
US4370370A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-12-01 | 1990-06-02 | 1990-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-01 | 1994-06-02 | 1994-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-01 | 1998-06-02 | 1998-12-02 | $7700.00 | Window Closed / Lapsed |