Patent US4181771A successfully refreshed from Google Patents.
US4181771A
Expired / Lapsed
US
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Thermally responsive record material
Assignee: WTA Inc
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Filing: 1977-11-04
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Granted: 1980-01-01
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Expires: 1997-11-04
Abstract
Abstract A thermally sensitive record material having a very low abrasive surface comprising a substrate coated with a colorless chromogenic material and a phenolic co-reactant in a binder and including a cross-linked urea-formaldehyde resin pigment as a component thereof. The use of the urea-formaldehyde (UF) resin pigment provides a thermal record material with superior bleed resistance, extremely low abrasivity, thereby reducing wear on imaging tools such as print heads, and improved release properties. The UF pigment also improves the image to background contrast and the efficiency of the action of the co-reactants in the record material.
Inventors
- 👤 Duane E. Hanson
- 👤 Philip R. Bartels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:03
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/337; B41M5/3372; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/26; Y10T428/27; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31942; Y10T428/31949; Y10T428/31964; Y10T428/31971; Y10T428/31975; Y10T428/31978; Y10T428/31982
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
62 words
A thermally responsive record material comprising a substrate coated with a substantially colorless chromogeneous compound, a phenolic compound which is capable of liquefying and/or vaporizing at normal thermographic temperatures and thereby to react with said substantially colorless chromogeneous compound to form a colored mark, a substantially water-insoluble, cross-linked urea-formaldehyde agglomerated resin pigment in highly dispersed particulate form, and a suitable binder therefor.
Claim 2
Dependent Claim
62 words
A thermally responsive record material comprising a substrate coated with a substantially colorless chromogeneous compound, a phenolic compound which is capable of liquefying and/or vaporizing at normal thermographic temperatures and thereby to react with said substantially colorless chromogeneous compound to form a colored mark, a substantially water-insoluble, cross-linked urea-formaldehyde agglomerated resin pigment in highly dispersed particulate form, and a suitable binder therefor.
Claim 3
Dependent Claim
28 words
A thermally responsive record material in accordance with claim 1, wherein said urea-formaldehyde resin pigment has a mean agglomerate size of from about 2 to about 10 microns.
Claim 4
Dependent Claim
31 words
A thermally responsive record material in accordance with claim 1, wherein the BET specific surface area of said urea-formaldehyde resin pigment is about 40 to about 75 square meters per gram.
Claim 5
Dependent Claim
30 words
A thermally responsive record material in accordance with claim 1, wherein the molar ratio of urea to formaldehyde in said urea-formaldehyde resin pigment is from about 1:1.3 to about 1:1.8.
Claim 6
Dependent Claim
20 words
A thermally responsive record material in accordance with claim 1, wherein at least a portion of the binder is water-soluble.
Claim 7
Dependent Claim
30 words
A thermally responsive record material in accordance with claim 5, wherein the binder is selected from the group consisting of polyvinyl alcohol, starch, hydroxyethylcellulose, methylcellulose, hydroxypropyl methylcellulose and mixtures thereof.
Claim 8
Dependent Claim
16 words
A thermally responsive record material in accordance with claim 6, wherein the binder is polyvinyl alcohol.
Claim 9
Dependent Claim
15 words
A thermally responsive record material in accordance with claim 6, wherein the binder is starch.
Claim 10
Dependent Claim
15 words
A thermally responsive record material in accordance with claim 6, wherein the binder is hydroxyethylcellulose.
Claim 11
Dependent Claim
15 words
A thermally responsive record material in accordance with claim 6, wherein the binder is methylcellulose.
Claim 12
Dependent Claim
16 words
A thermally responsive record material in accordance with claim 6, wherein the binder is hydroxypropyl methylcellulose.
Claim 13
Dependent Claim
18 words
A thermally responsive record material in accordance with claim 1, which further comprises a lubricant or release agent.
Claim 14
Dependent Claim
16 words
A thermally responsive record material in accordance with claim 12, wherein the lubricant is zinc stearate.
Claim 15
Dependent Claim
16 words
A thermally responsive record material in accordance with claim 12, wherein the lubricant is lithium stearate.
Claim 16
Dependent Claim
19 words
A thermally responsive record material in accordance with claim 12, wherein the release agent is a fatty diamide wax.
Claim 17
Dependent Claim
25 words
A thermally responsive record material in accordance with claim 15, wherein said fatty diamide wax is a reaction product of hydrogenated castor oil and ethanolamine.
Claim 18
Dependent Claim
16 words
A thermally responsive record material in accordance with claim 12, wherein the release agent is stearamide.
Claim 19
Dependent Claim
17 words
A thermally responsive record material in accordance with claim 12, wherein the release agent is behenyl alcohol.
Claim 20
Dependent Claim
16 words
A thermally responsive record material in accordance with claim 12, wherein the release agent is stearone.
Claim 21
Dependent Claim
15 words
A thermally responsive record material in accordance with claim 1, wherein the substrate is paper.
Claim 22
Dependent Claim
21 words
A thermally responsive record material in accordance with claim 1, wherein the substantially chromogeneous compound is a phthalide or fluoran compound.
Claim 23
Dependent Claim
20 words
A thermally responsive record material in accordance with claim 21, wherein said substantially colorless chromogeneous compound is Crystal Violet Lactone.
Claim 24
Dependent Claim
19 words
A thermally responsive record material in accordance with claim 21, wherein said substantially colorless chromogeneous compound is 2'-anilino-3'-methyl-6'-diethylamino fluoran.
Claim 25
Dependent Claim
17 words
A thermally responsive record material in accordance with claim 1, wherein said phenolic compound is bisphenol A.
Claim 26
Dependent Claim
96 words
A process for the preparation of thermally responsive record material which comprises (A) preparing separate aqueous dispersions comprising (1) substantially colorless chromogenic material and a binder, (2) a phenolic compound which is capable of liquefying and/or vaporizing at normal thermographic temperatures and thereby to react with said substantially colorless chromogeneous compound to form a colored mark, a binder and a lubricant or wax, and (3) a substantially water-insoluble, cross-linked urea-formaldehyde agglomerated resin pigment in highly dispersed particulate form, (B) blending said dispersions to provide a coating formulation, and (C) coating said formulation on a substrate sheet.
Claim 27
Dependent Claim
96 words
A process for the preparation of thermally responsive record material which comprises (A) preparing separate aqueous dispersions comprising (1) substantially colorless chromogenic material and a binder, (2) a phenolic compound which is capable of liquefying and/or vaporizing at normal thermographic temperatures and thereby to react with said substantially colorless chromogeneous compound to form a colored mark, a binder and a lubricant or wax, and (3) a substantially water-insoluble, cross-linked urea-formaldehyde agglomerated resin pigment in highly dispersed particulate form, (B) blending said dispersions to provide a coating formulation, and (C) coating said formulation on a substrate sheet.
Claim 28
Dependent Claim
22 words
A process in accordance with claim 25, wherein the dispersions comprising the substantially colorless chromogenic material includes a wetting agent and defoamer.
Claim 29
Dependent Claim
20 words
A process in accordance with claim 25, wherein the dispersion comprising the phenolic compound includes a wetting agent and defoamer.
Claim 30
Dependent Claim
25 words
A process in accordance with claim 25, wherein the dispersion comprising the substantially colorless chromogenic material contains about 15 to 40 percent solids in water.
Claim 31
Dependent Claim
23 words
A process in accordance with claim 25, wherein the dispersion comprising the phenolic compound contains about 15 to 40 percent solids in water.
Claim 32
Dependent Claim
25 words
A process in accordance with claim 25, wherein the dispersion containing the urea-formaldehyde resin pigment contains about 5 to 50% dry weight of said pigment.
Claim 33
Dependent Claim
57 words
A process in accordance with claim 25, wherein the coating formulation comprises about 1 to 10% by weight of said substantially colorless chromogenic material, about 5 to 50% by weight of said phenolic compound, about 10 to 60% by weight of a binder and greater than 0% to about 50% by weight of said urea-formaldehyde resin pigment.
Claim 34
Dependent Claim
32 words
A process in accordance with claim 31, wherein the coating formulation further includes about 1 to 10% by weight of a lubricant and about 1 to 25% by weight of a wax.
Claim 35
Dependent Claim
25 words
A process in accordance with claim 32, wherein the coating formulation further includes less than about 1% by weight of a wetting agent and defoamer.
Claim 36
Dependent Claim
23 words
A process in accordance with claim 32, wherein the coating formulation contains up to about 30% by weight of said urea-formaldehyde resin pigment.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-12-31 | 1983-07-02 | 1984-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-31 | 1987-07-02 | 1988-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-31 | 1991-07-02 | 1992-01-01 | $7700.00 | Window Closed / Lapsed |