US5376617A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystal modification of 2-(3-methylanilion)-3-methyl-6-diethylamino-fluoran, process for the preparation thereof, and recording materials containing said crystal modification
Assignee: Yamamoto Chemicals Inc
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Filing: 1994-05-02
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Granted: 1994-12-27
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Expires: 2014-05-02
Abstract
Abstract The improved β-type crystal modification of 2-(3-methylanilino)-3-methyl-6-diethylaminofluoran has high solubility in inner-phase solvents. The compound is very useful as a color former for pressure-sensitive recording materials and thermal recording materials. Recording materials that use this compound as color former exhibit good performance in various characteristics such as whiteness of the background, its storage stability, color rendition, sensitivity for color formation and color fastness of image.
Inventors
- 👤 Yojiro Kumagae
- 👤 Shigeo Fujita
- 👤 Mansuke Matsumoto
- 👤 Sayuri Wada
- 👤 Shuuichi Hashimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:15
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0025; B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/136; B41M5/145; B41M5/1455; B41M5/26; B41M5/30; B41M5/323; B41M5/327; B41M5/3275; C07; C07D; C07D493/00; C07D493/02; C07D493/10; C09B11/00; C09B11/04; C09B11/10; C09B11/24
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
76 words
In a recording material that utilizes the color reaction between an electron donating color former and an electron accepting color developer, the improvement wherein there is contained as the electron donating color former a β-type crystal modification of 2-(3-methylanilino)-3-methyl-6-diethylaminofluoran that is characterized by characteristic peaks at diffraction angles at 2θ°±0.2° of 7.6°, 12.2°, 14.9°, 15.9°, 17.6° and 22.8° on X-ray diffractiometry using Cu-Kα rays and which has a melting point in the range of 186°-191° C.
Claim 2
Dependent Claim
76 words
In a recording material that utilizes the color reaction between an electron donating color former and an electron accepting color developer, the improvement wherein there is contained as the electron donating color former a β-type crystal modification of 2-(3-methylanilino)-3-methyl-6-diethylaminofluoran that is characterized by characteristic peaks at diffraction angles at 2θ°±0.2° of 7.6°, 12.2°, 14.9°, 15.9°, 17.6° and 22.8° on X-ray diffractiometry using Cu-Kα rays and which has a melting point in the range of 186°-191° C.
Claim 3
Dependent Claim
13 words
A recording material according to claim 1 which is a pressure-sensitive recording material.
Claim 4
Dependent Claim
13 words
A recording material according to claim 1 which is a thermal recording material.
Claim 5
Dependent Claim
35 words
A thermal recording material according to claim 3 which uses bisphenol A as the electron accepting color developer and which uses at least one sensitizer selected from among p-benzylbiphenyl, m-terphenyl, 2-benzyloxynaphthalene, di-(p-methylbenzyl) oxalate and 1,2-di-m-toluoxyethane.
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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) | 1997-12-26 | 1998-06-27 | 1998-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-12-26 | 2002-06-27 | 2002-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-12-26 | 2006-06-27 | 2006-12-27 | $7700.00 | Window Closed / Lapsed |