US4770904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of a pressure-sensitive recording material
Assignee: Novartis Corp
•
Filing: 1987-01-16
•
Granted: 1988-09-13
•
Expires: 2007-01-16
Abstract
Abstract There is disclosed a process for the preparation of a pressure-sensitive recording material which contains in its color forming system a color former and a developer therefor, which process comprises using said color former in the amorphous state. When the color former is in this state, it dissolves more readily and the pressure-sensitive recording material so obtained has good color forming properties and enhanced color strength.
Inventors
- 👤 Rudolf Zink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:07
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/132
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
79 words
A process for the preparation of a color former sheet for a pressure sensitive recording material containing a pair of sheets, one coated with a composition containing the color former and the second containing an electron acceptor or developer, said process comprising: (a) dissolving in a non-volatile organic solvent an amorphous color former capable of reacting with a color developer material; (b) encapsulating the color former solution; and (c) coating the resulting microcapsules onto a sheet of support material.
Claim 2
Dependent Claim
79 words
A process for the preparation of a color former sheet for a pressure sensitive recording material containing a pair of sheets, one coated with a composition containing the color former and the second containing an electron acceptor or developer, said process comprising: (a) dissolving in a non-volatile organic solvent an amorphous color former capable of reacting with a color developer material; (b) encapsulating the color former solution; and (c) coating the resulting microcapsules onto a sheet of support material.
Claim 3
Dependent Claim
36 words
A process according to claim 1, which comprises using an amorphous color former that has been obtained by heating a color former in crystalline form to a melt, cooling said melt, and pulverising the resultant solid.
Claim 4
Dependent Claim
26 words
A process according to claim 1, which comprises using an amorphous color former that has a softening point in the range from 30° to 130° C.
Claim 5
Dependent Claim
12 words
A process according to claim 1, wherein the color former is 3,3-bis(4'dimethylaminophenyl)-6-dimethylaminophthalide.
Claim 6
Dependent Claim
12 words
A process according to claim 1, wherein the color former is 2-phenylamino-3-methyl-6-diethylaminofluorane.
Claim 7
Dependent Claim
17 words
A process according to claim 1, wherein the color former is a mixture of 2-dibenzylamino-3-methyl-6-pyrrolidinofluorane and 2-dibenzylamino-6-pyrrolidinofluorane.
References Cited (Backward Citations)
US4376150A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-13 | 1992-03-14 | 1992-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-13 | 1996-03-14 | 1996-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-13 | 2000-03-14 | 2000-09-13 | $7700.00 | Window Closed / Lapsed |