US4833119A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color-developing sheet for pressure-sensitive recording sheets
Assignee: Nippon Paper Industries Co Ltd
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Filing: 1987-12-29
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Granted: 1989-05-23
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Expires: 2007-12-29
Abstract
Abstract The color-developing sheet for pressure-sensitive recording sheets contains a color-developing agent comprising a polyvalent metal salt of aromatic carboxylic acid in combination with a polyvalent metal salt of carboxylated terpenephenol resin and/or a reaction product of carboxylated terpenephenol resin, aromatic carboxylic acid and polyvalent metal compound. This color-developing sheet provides a higher color-developing rate and a superior color-developing intensity.
Inventors
- 👤 Hiroaki Umeda
- 👤 Mamoru Suzuki
- 👤 Akira Hasegawa
- 👤 Kunio Hata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:28
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/155; Y; Y10; Y10S; Y10S428/00; Y10S428/914; Y10T; Y10T428/00; Y10T428/27; Y10T428/273; Y10T428/277
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
82 words
A color-developing sheet for pressure sensitive recording sheet comprising a polyvalent metal salt of aromatic carboxylic acid as a color-developing agent and an electron donating colorless dyestuff as a color-forming agent, said color-developing sheet having on a substrate a polyvalent metal salt of aromatic carboxylic acid in combination with at least one substance selected from the group consisting of a polyvalent metal salt of carboxylated terpenephenol resin and a reaction product of carboxylated terpenephenol resin, aromatic carboxylic acid and polyvalent metal compound.
Claim 2
Dependent Claim
82 words
A color-developing sheet for pressure sensitive recording sheet comprising a polyvalent metal salt of aromatic carboxylic acid as a color-developing agent and an electron donating colorless dyestuff as a color-forming agent, said color-developing sheet having on a substrate a polyvalent metal salt of aromatic carboxylic acid in combination with at least one substance selected from the group consisting of a polyvalent metal salt of carboxylated terpenephenol resin and a reaction product of carboxylated terpenephenol resin, aromatic carboxylic acid and polyvalent metal compound.
Claim 3
Dependent Claim
13 words
The color-developing sheet according to claim 1, wherein said polyvalent metal is zinc.
Claim 4
Dependent Claim
26 words
The color-developing sheet according to claim 1, wherein said substance is at least 1% by weight, based on said polyvalent metal salt of aromatic carboxylic acid.
Claim 5
Dependent Claim
26 words
The color-developing sheet according to claim 3, wherein said substance is at least 30% by weight, based on said polyvalent metal salt of aromatic carboxylic acid.
Claim 6
Dependent Claim
30 words
The color-developing sheet according to claim 1, wherein said color-developing agent is contained in a range of 10-70% by weight, based on the total solid content in said color-developing layer.
Claim 7
Dependent Claim
19 words
The color-developing sheet according to claim 1, wherein the weight of said color-developing layer is 1.0-10.0 g/m 2 .
Claim 8
Dependent Claim
45 words
The color-developing sheet according to claim 1, wherein said color-developing agent is used in combination with at least one dye selected from the group consisting of triphenylmethane leuco dyes, fluoran leuco dyes, spiropyran leuco dyes, phenothiazine leuco dyes, phthalide leuco dyes and indol leuco dyes.
Claim 9
Dependent Claim
16 words
The color-developing sheet according to claim 1, wherein said aromatic carboxylic acid is aromatic monocarboxylic acid.
References Cited (Backward Citations)
JPS60159540A
Cited
US4749680A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-22 | 1992-11-21 | 1993-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-22 | 1996-11-21 | 1997-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-22 | 2000-11-21 | 2001-05-23 | $7700.00 | Window Closed / Lapsed |