US3908547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrophilizing solution for electrophotographic images
Assignee: Hoechst AG
•
Filing: 1972-03-16
•
Granted: 1975-09-30
•
Expires: 1992-03-16
Abstract
Abstract This invention relates to a process for hydrophilizing the nonimage areas of an electrophotographically-produced printing master which comprises treating the master with a hydrophilizing solution which comprises water, at least one bivalent metal salt, at least one easily hydrolyzable metal salt, and a water-soluble urea-formaldehyde resin curable by a bivalent metal salt.
Inventors
- 👤 Jurgen Rochlitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:39
CPC Classifications
B; B41; B41N; B41N3/00; B41N3/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
197 words
A PROCESS FOR HYDROPHIIZING THE NON-IMAGE AREAS OF AN ELECTROPHOTOGRAPHICALLY-PRODUCED PRINTING MASTER WHICH COMPRISES TREATING THE MASTER WITH A HYDROPHILIZING SOLUTION WHICH COMPRISES A. WATER, B. AT LEAST ONE BIVALENT METAL SAT SELECTED FROM THE GROUP CONSISTING OF WATER-SOLUBLE ACETATES, NITRATES, CHLORIDES, AND FORMATES OF COPPER, COBALT, NICKEL, MANGANESE AND IRON, SAID BIVALENT METAL SALT BEING USED IN A CONCENTRATION IN THE RANGE OF ABOUT 1 TO 10 PER CENT BY WEIGHT, CALCULATED ON THE WEIGHT OF TOTAL AQUEOUS SOLUTION, C. AT LEAST ONE EASILY HYDROLYZABLE METAL SALT SELECTED FROM THE GROUP CONSISTING OF IRON (111) CHLORIDE, ALUMINUM CHLORIDE (CRYST.), CERIUM (111) AMMONIUM NITRATE, CERIUM (1V) AMMONIUM SULFATE, CERIUM (111) NITRATE, ALUMINUM POTASSIUM SULFATE, CHROMIUM (111) NITRATE, IRON (111) NITRATE, BISMUTH NITRATE AND COBALT (111) CHLORIDE, SAID EASILY HYDROLYZABLE METAL SALT BENG USED IN A QUANTITY IN THE RANGE OF ABOUT 10 TO 150 PER CENT BY WEIGHT, CALCULATED ON THE WEIGHT OF THE BIVALENT METAL SALT, AND D. A WATER-SOLUBLE UREA-FORMALDEHYDE RESIN CURABLE BY A BIVALENT METAL SALT, SAID RESIN BEING PRESENT IN A QUANTITY IN THE RANGE OF ABOUT 5 TO 25 PER CENT BY WEIGHT, CALCULATED ON THE WEIGHT OF THE TOTAL AQUEOUS SOLUTION.
Claim 2
Dependent Claim
197 words
A PROCESS FOR HYDROPHIIZING THE NON-IMAGE AREAS OF AN ELECTROPHOTOGRAPHICALLY-PRODUCED PRINTING MASTER WHICH COMPRISES TREATING THE MASTER WITH A HYDROPHILIZING SOLUTION WHICH COMPRISES A. WATER, B. AT LEAST ONE BIVALENT METAL SAT SELECTED FROM THE GROUP CONSISTING OF WATER-SOLUBLE ACETATES, NITRATES, CHLORIDES, AND FORMATES OF COPPER, COBALT, NICKEL, MANGANESE AND IRON, SAID BIVALENT METAL SALT BEING USED IN A CONCENTRATION IN THE RANGE OF ABOUT 1 TO 10 PER CENT BY WEIGHT, CALCULATED ON THE WEIGHT OF TOTAL AQUEOUS SOLUTION, C. AT LEAST ONE EASILY HYDROLYZABLE METAL SALT SELECTED FROM THE GROUP CONSISTING OF IRON (111) CHLORIDE, ALUMINUM CHLORIDE (CRYST.), CERIUM (111) AMMONIUM NITRATE, CERIUM (1V) AMMONIUM SULFATE, CERIUM (111) NITRATE, ALUMINUM POTASSIUM SULFATE, CHROMIUM (111) NITRATE, IRON (111) NITRATE, BISMUTH NITRATE AND COBALT (111) CHLORIDE, SAID EASILY HYDROLYZABLE METAL SALT BENG USED IN A QUANTITY IN THE RANGE OF ABOUT 10 TO 150 PER CENT BY WEIGHT, CALCULATED ON THE WEIGHT OF THE BIVALENT METAL SALT, AND D. A WATER-SOLUBLE UREA-FORMALDEHYDE RESIN CURABLE BY A BIVALENT METAL SALT, SAID RESIN BEING PRESENT IN A QUANTITY IN THE RANGE OF ABOUT 5 TO 25 PER CENT BY WEIGHT, CALCULATED ON THE WEIGHT OF THE TOTAL AQUEOUS SOLUTION.
Claim 3
Dependent Claim
17 words
A process according to claim 1 in which the solution includes a plurality of bivalent metal salts.
Claim 4
Dependent Claim
14 words
A process according to claim 1 in which the solution contains a water-soluble solvent.
Claim 5
Dependent Claim
19 words
A process according To claim 1 in which the solution constitutes at least a part of a fountain solution.
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) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |