US4769305A
Expired / Lapsed
US
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Pressure-sensitive recording material
Assignee: Fujifilm Holdings Corp
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Filing: 1987-01-08
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Granted: 1988-09-06
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Expires: 2007-01-08
Abstract
Abstract A pressure-sensitive recording material is described, comprising an electron-donating color former and an electron-accepting color developer wherein said color developer comprises a mixture of (a) an aromatic carboxylic acid metal salt and (b) a hindered phenol as a combined electron-accepting color developer. The aromatic carboxylic acids should desirably have a hydroxyl group in the ortho or para position to the carboxyl group and preferably is a salicylic acid derivative. The hindered phenols preferably have an alkyl substituent in at least one of the 2 and 6 positions. This pressure-sensitive recording material can provide color images having an excellent fastness to light and solvents.
Inventors
- 👤 Shojiro Sano
- 👤 Keiso Saeki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:11
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/132
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
175 words
A pressure-sensitive recording material capable of forming an image upon color development due to the reaction of an electron-donating color former and an electron-accepting color developer, wherein the color developer comprises a mixture of (a) a metal salt of an aromatic carboxylic acid and (b) a hindered phenol which is a phenol having an alkyl substitutent in at least one of the positions 2 and 6 or is a derivative thereof and which contains a plurality of phenolic hydroxyl groups wherein the proportion of the hindered phenol compound in the color developer comprising a mixture of the aromatic carboxylic acid metal salt and the hindered phenol compound is in the range of 5 to 60% by weight, wherein the aromatic carboxylic acid used is represented by the following formula (I): ##STR3## wherein R 1 and R 2 , which may be the same or different, each represents an alkyl group having 3 to 10 carbon atoms, an aryl group having 6 to 12 carbon atoms or an aralkyl group having 7 to 15 carbon atoms.
Claim 2
Dependent Claim
175 words
A pressure-sensitive recording material capable of forming an image upon color development due to the reaction of an electron-donating color former and an electron-accepting color developer, wherein the color developer comprises a mixture of (a) a metal salt of an aromatic carboxylic acid and (b) a hindered phenol which is a phenol having an alkyl substitutent in at least one of the positions 2 and 6 or is a derivative thereof and which contains a plurality of phenolic hydroxyl groups wherein the proportion of the hindered phenol compound in the color developer comprising a mixture of the aromatic carboxylic acid metal salt and the hindered phenol compound is in the range of 5 to 60% by weight, wherein the aromatic carboxylic acid used is represented by the following formula (I): ##STR3## wherein R 1 and R 2 , which may be the same or different, each represents an alkyl group having 3 to 10 carbon atoms, an aryl group having 6 to 12 carbon atoms or an aralkyl group having 7 to 15 carbon atoms.
Claim 3
Dependent Claim
28 words
The pressure-sensitive recording material as claimed in claim 1, wherein said aromatic carboxylic acid has a hydroxyl group in the ortho or para position to the carboxyl group.
Claim 4
Dependent Claim
65 words
The pressure-sensitive recording material as claimed in claim 2, wherein said aromatic carboxylic acid is a salicylic acid derivative having at least one substituent selected from the group consisting of an alkyl group, an aryl group or an aralkyl group, in the ortho and/or para position to the hydroxyl group, with the sum of the carbon atoms in the substituents being not less than 8.
Claim 5
Dependent Claim
48 words
The pressure-sensitive recording material as claimed in claim 1, wherein the metal constituting said metal salt is selected from the group consisting of magnesium, aluminum, calcium, scandium, titanium, vanadium, chromium, maganese, iron, cobalt, nickel, copper, zinc, potassium, germanium, strontium, yttrium, zirconium, molybdenum, cadmium, indium, antimony, barium and tin.
Claim 6
Dependent Claim
32 words
The pressure-sensitive recording material as claimed in claim 1, wherein said hindered phenol has a tert-butyl group in at least one of the positions 2 and 6 or is a derivative thereof.
Claim 7
Dependent Claim
36 words
The pressure-sensitive recording material as claimed in claim 1, wherein the proportion of the hindered phenol in the aromatic carboxylic metal acid salt-hindered phenol mixture is in the range of from 10 to 40% by weight.
Claim 8
Dependent Claim
52 words
The pressure-sensitive recording material claimed in claim 1, wherein the carboxylic acid used is represented by the formula (I) and wherein R 1 and R 2 , which may be the same or different, each represents a t-butyl group, a t-amyl group, a t-hexyl group, a α,α-dimethyl-benzyl group or a α-methylbenzyl group.
Claim 9
Dependent Claim
26 words
The pressure-sensitive recording materials claimed in claim 4, wherein the metal constituting said metal salt is selected form the group consisting of zinc, aluminum and calcium.
Claim 10
Dependent Claim
17 words
The pressure-sensitive recording material claimed in claim 8, wherein the metal constituting said metal salt is zinc.
Claim 11
Dependent Claim
61 words
The pressure-sensitive recording material claimed in claim 1, wherein the hindered phenol is represented by the formulae (II) or (III): ##STR4## wherein R 3 represents a t-butyl group, a methyl group, an ethyl group or a hydrogen atom; R 4 represents a hydrogen atom, a methyl group or an ethyl group, and X represents a sulfur atom or a alkylene group.
Claim 12
Dependent Claim
38 words
The pressure-sensitive recording material claimed in claim 1, wherein the color former is selected from the group consisting essentially of triarylmethane type compounds, diphenylmethane type compounds, xanthene type compounds, thiazine type compounds, spiro type compounds, and mixtures thereof.
Claim 13
Dependent Claim
25 words
The pressure-sensitive recording material claimed in claim 1, wherein the color former is coated in an amount of about 0.01 to 0.2 g/m 2 .
Claim 14
Dependent Claim
24 words
The pressure-sensitive recording material claimed in claim 12, wherein the color former is coated in an amount of 0.03 to 0.1 g/m 2 .
Claim 15
Dependent Claim
47 words
The pressure-sensitive recording material claimed in claim 10, wherein the metal constituting said metal salt is selected from the group consisting of magnesium, aluminum, calcium, scandium, titanium, vanadium, chromium, maganese, iron, cobalt, nickel, copper, zinc, potassium, germanium, strontium, yttrium, zirconium, molybdemum, cadmium, indium, tin, antimony, and barium.
Claim 16
Dependent Claim
25 words
The pressure-sensitive recording material claimed in claim 14, wherein the color former is coated in an amount of about 0.01 to 0.2 g/m 2 .
Claim 17
Dependent Claim
53 words
The pressure-sensitive recording material claimed in claim 15, wherein the carboxylic acid used is represented by the formula (I) and wherein R 1 and R 2 , which may be the same or different, each represents a t-butyl group, a t-amyl group, a t-hexyl group, an α-dimethylbenzyl group or an α-methyl benzyl group.
Claim 18
Dependent Claim
45 words
The pressure-sensitive recording material claimed in claim 15, wherein the aromatic carboxylic acid of the metal salt of an aromatic carboxylic acid is selected from the group consisting of 3,5-di-tert-butylsalicylic acid, 3,5-di-tert amylsalicylic acid, 3,5-bis(α,α-dimethylbenzyl)salicylic acid, 3,5-bis(α-methylbenzyl)salicylic acid, 3-(α-methylbenzyl)-5-(α,α-dimethylbenzyl)salicylic acid, 3,5-di-tert-octylsalicylic acid and 3-cyclohexyl-5-(α,α-dimethylbenzyl)salicylic acid.
Claim 19
Dependent Claim
19 words
The pressure-sensitive recording material claimed in claim 17, wherein the hindered phenol has two or three phenolic hydroxyl groups.
Claim 20
Dependent Claim
26 words
The pressure-sensitive recording material claimed in claim 18, wherein said hindered phenol has a tert-butyl group in at least one of the two or six positions.
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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) | 1991-09-06 | 1992-03-07 | 1992-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-06 | 1996-03-07 | 1996-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-06 | 2000-03-07 | 2000-09-06 | $7700.00 | Window Closed / Lapsed |