US4640714A
Expired / Lapsed
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Alcohol-based flexographic ink for use in backcarbon papers
Assignee: Mitsubishi Paper Mills Ltd
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Filing: 1984-08-22
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Granted: 1987-02-03
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Expires: 2004-08-22
Abstract
Abstract When a transferred image is formed on a plain paper by the use of a colorless backcarbon paper coated with an alcohol-based flexographic ink composed essentially of (A) microcapsules whose core substance is an oil droplet containing an electron-donating organic color former, (B) microcapsules whose core substance is an oil droplet containing an electron-accepting organic color developer, (C) a binder resin and (D) a solvent composed mainly of a lower alcohol of 1 to 3 carbon atoms, the density of the transferred image is improved by adding an appropriate amount of a wax to the core substance(s) of either or both of the above microcapsules (A) and (B).
Inventors
- 👤 Nobuhiro Kagota
- 👤 Hideaki Senoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:37
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/165
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
84 words
An alcohol-based flexographic ink for use in colorless backcarbon papers which is composed essentially of (A) microcapsules whose core substance is an oil droplet containing an electron-donating organic color former, (B) microcapsules whose core substance is an oil droplet containing an electron-accepting organic color developer, (C) a binder resin and (D) a solvent composed mainly of a lower alcohol of 1 to 3 carbon atoms, characterized in that either or both of the core substances of the microcapsules (A) and (B) contain a wax.
Claim 2
Dependent Claim
84 words
An alcohol-based flexographic ink for use in colorless backcarbon papers which is composed essentially of (A) microcapsules whose core substance is an oil droplet containing an electron-donating organic color former, (B) microcapsules whose core substance is an oil droplet containing an electron-accepting organic color developer, (C) a binder resin and (D) a solvent composed mainly of a lower alcohol of 1 to 3 carbon atoms, characterized in that either or both of the core substances of the microcapsules (A) and (B) contain a wax.
Claim 3
Dependent Claim
37 words
An alcohol-based flexographic ink for use in colorless backcarbon papers according to claim 1, wherein the amount of a wax is 50% by weight or less by weight based on the total amount of the core substance.
Claim 4
Dependent Claim
51 words
An alcohol-based flexographic ink for use in colorless backcarbon papers according to claim 1, wherein there is further added, as an improver for transferred image density, a mono-, di- or tri-ester between an aliphatic alcohol whose alkyl group has 6 to 18 carbon atoms and phosphoric acid, or a salt thereof.
Claim 5
Dependent Claim
33 words
An alcohol-based flexographic ink for use in colorless backcarbon papers according to claim 1, wherein the main film material of the microcapsules (A) and (B) is a melamine-formaldehyde resin or an urea-formaldehyde resin.
Claim 6
Dependent Claim
30 words
An alcohol-based flexographic ink for use in colorless backcarbon papers according to claim 1, wherein the microcapsules (A) and (B) have an average particle diameter of 3 to 15 μm.
Claim 7
Dependent Claim
22 words
An alcohol-based flexographic ink according to claim 5 wherein the microcapsules (A) and (B) have an average particle diameter of 6-10 μm.
Claim 8
Dependent Claim
25 words
An alcohol-based flexographic ink according to claim 1 wherein the solvent consists essentially of methyl alcohol, ethyl alcohol, isopropyl alcohol, n-propyl alcohol or mixtures thereof.
Claim 9
Dependent Claim
19 words
An alcohol-based flexographic ink according to claim 7 wherein the solvent consists essentially of methyl alcohol or ethyl alcohol.
Claim 10
Dependent Claim
37 words
An alcohol-based flexographic ink according to claim 7 wherein there is present in addition to the alcohol as a main component a small amount of water, methyl acetate, ethyl acetate, butyl acetate, methyl cellosolve or ethyl cellosolve.
Claim 11
Dependent Claim
28 words
An alcohol-based flexographic ink according to claim 2 wherein the amount of wax is 2 to 7% by weight based on the total amount of the core substance.
Claim 12
Dependent Claim
18 words
An alcohol-based flexographic ink according to claim 1 wherein the wax is a paraffin wax or rice wax.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-02 | 1990-08-04 | 1991-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-02 | 1994-08-04 | 1995-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-02 | 1998-08-04 | 1999-02-03 | $7700.00 | Window Closed / Lapsed |