US4159203A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aqueous black ink and process for the production thereof
Assignee: Olympia Werke AG
•
Filing: 1978-09-01
•
Granted: 1979-06-26
•
Expires: 1998-09-01
Abstract
Abstract An aqueous black ink for a writing process in which ink is transferred in droplets onto a print carrier. The ink comprises 25-42 g./l. of the direct Diamine Blue 6B, extra high concentration; 14-22 g./l. of the direct dye Diamine Scarlet 4BS, extra concentration; 290-430 ml./l. of formamide; 32-48 ml./l. of 90% diethanolamine, 24-60 g./l. of citric acid, a water-soluble and organic soluble disinfectant, and balance essentially water. A process for producing such an ink comprises the steps of mixing both dyes together; introducing the mixture at room temperature in incremental portions into the formamide and stirring until the dyes are substantially completely dissolved. Undissolved salts are removed from the mixture. Diethanolamine and distilled water are introduced under agitation into the mixture. The pH is adjusted to about 6 to 8 with citric acid and disinfectant is added. The mixture is filtered under vacuum and then gases are withdrawn by treating the mixture under a vacuum.
Inventors
- 👤 Ehrenfried Loock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:50
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/16; C09D11/17; C09D11/30; C09D11/32; C09D11/328
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
64 words
Aqueous black ink for a writing process wherein ink is transferred in droplets onto a print carrier comprising: 25-42 g./l. of the direct dye Diamine Blue 6B, extra high concentration; 14-22 g./l. of the direct dye Diamine Scarlet 4BS, extra concentration; 290-430 ml./l. of formamide; 32-48 ml./l. of 90% diethanolamine, 24-60 g./l. of citric acid; a water-soluble and organic-soluble disinfectant; and balance essentially water.
Claim 2
Dependent Claim
64 words
Aqueous black ink for a writing process wherein ink is transferred in droplets onto a print carrier comprising: 25-42 g./l. of the direct dye Diamine Blue 6B, extra high concentration; 14-22 g./l. of the direct dye Diamine Scarlet 4BS, extra concentration; 290-430 ml./l. of formamide; 32-48 ml./l. of 90% diethanolamine, 24-60 g./l. of citric acid; a water-soluble and organic-soluble disinfectant; and balance essentially water.
Claim 3
Dependent Claim
19 words
The aqueous ink as defined in claim 1, wherein the pH of the ink is about 6 to 8.
Claim 4
Dependent Claim
15 words
The aqueous ink as defined in claim 1, wherein the ink contains a corrosion inhibitor.
Claim 5
Dependent Claim
14 words
The aqueous ink as defined in claim 1, wherein the water is distilled water.
Claim 6
Dependent Claim
106 words
Process for producing the ink according to claim 1, comprising the sequential steps of: mixing both dyes together; introducing the mixture at room temperature in incremental portions into the formamide, which is agitated by constant stirring; constantly further stirring the thus-obtained mixture until the dyes are substantially completely dissolved; removing undissolved salts from the mixture; introducing diethanolamine and distilled water under agitation into the mixture; adjusting the pH to about 6 to 8 with citric acid; thereafter adding disinfectant under agitation to the mixture; filtering the mixture under vacuum through a fine filter; and withdrawing gases from the mixture by treating the mixture under a vacuum.
Claim 7
Dependent Claim
13 words
Process according to claim 5, wherein the pH is adjusted to about 6.
Claim 8
Dependent Claim
56 words
Process according to claim 5, wherein the pH is adjusted to about 8 with the citric acid, and after addition of the disinfectant and before the filtering under vacuum, adding a water-miscible, non-crystallizable corrosion inhibitor, consisting essentially of an alkanolamine salt of a nitrogen-containing condensation product, in an amount of 0.2-2.0% by weight of the ink.
Claim 9
Dependent Claim
15 words
Process according to claim 5, wherein the constant further stirring is for about 15 minutes.
Claim 10
Dependent Claim
17 words
Process according to claim 5, wherein the removing of undissolved salts is achieved by filtering the mixture.
Claim 11
Dependent Claim
17 words
Process according to claim 5, wherein the withdrawing of gases under vacuum is for about 20 minutes.
Claim 12
Dependent Claim
14 words
Process according to claim 5, wherein the fine filter is a 0.6μ membrane filter.
Claim 13
Dependent Claim
16 words
Process according to claim 9, wherein a coarse filter is used to remove the undissolved salts.
References Cited (Backward Citations)
US1787233A
Cited
US3519443A
Cited
DE2132324A1
Cited
US3705045A
Cited
DE2160475C3
Cited
DE2164614C3
Cited
DE2210512C3
Cited
DE2511902C2
Cited
US4101329A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-06-25 | 1982-12-25 | 1983-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-25 | 1986-12-25 | 1987-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-25 | 1990-12-25 | 1991-06-26 | $7700.00 | Window Closed / Lapsed |