US4566952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-stage process for the production of anodically oxidized aluminum planar materials and use of these materials in manufacturing offset-printing plates
Assignee: Hoechst AG
•
Filing: 1984-03-30
•
Granted: 1986-01-28
•
Expires: 2004-03-30
Abstract
Abstract Disclosed is a process for the production of a material in the form of a plate, a foil or a strip, from aluminum or an alloy thereof, which has been chemically, mechanically and/or electrochemically roughened. The process comprises a two-stage oxidation involving a first stage (a) which is performed in an aqueous electrolyte having from about 60 to 180 g/l of phosphoric acid, at a temperature of the electrolyte bath of about 47° to 70° C. and at a voltage of about 36 to 80 V and a second stage (b) which is performed in an aqueous electrolyte having from about 60 to 300 g/l of sulfuric acid, at a temperature of the electrolyte bath of about 30° to 65° C. and at a voltage of about 15 to 35 V. Also disclosed is an offset-printing plate, having a radiation-sensitive coating and a support material produced by the process described above.
Inventors
- 👤 Gerhard Sprintschnik
- 👤 Walter Niderstatter
- 👤 Joachim Stroszynski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:15
CPC Classifications
B; B41; B41N; B41N3/00; B41N3/03; B41N3/034; C; C25; C25D; C25D11/00; C25D11/02; C25D11/04; C25D11/12; Y; Y10; Y10S; Y10S205/00; Y10S205/921
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
118 words
A process for producing an aluminum or aluminum alloy material in the form of a plate, foil or strip, comprising the step of anodically oxidizing a support material in a two-stage oxidation process comprising the steps of: (a) first treating said support material in an aqueous electrolyte comprising from about 60 to 180 g/l of phosphoric acid, at a temperature of from about 47° to 70° C. and a voltage of from about 36 to 80 V, and (b) subsequently treating said support material in an aqueous electrolyte comprising from about 60 to 300 g/l of sulfuric acid, at a temperature of from about 30° to 65° C. and a voltage of from about 15 to 35 V.
Claim 2
Dependent Claim
118 words
A process for producing an aluminum or aluminum alloy material in the form of a plate, foil or strip, comprising the step of anodically oxidizing a support material in a two-stage oxidation process comprising the steps of: (a) first treating said support material in an aqueous electrolyte comprising from about 60 to 180 g/l of phosphoric acid, at a temperature of from about 47° to 70° C. and a voltage of from about 36 to 80 V, and (b) subsequently treating said support material in an aqueous electrolyte comprising from about 60 to 300 g/l of sulfuric acid, at a temperature of from about 30° to 65° C. and a voltage of from about 15 to 35 V.
Claim 3
Dependent Claim
51 words
A process as claimed in claim 1, wherein said first treating step comprises treating said support material in an aqueous electrolyte comprising from about 80 to 150 g/l of phosphoric acid, at a temperature of from about 50° to 65° C. and a voltage of from about 40 to 70 V.
Claim 4
Dependent Claim
51 words
A process as claimed in claim 1, wherein said second treating step comprises treating said support material in an aqueous electrolyte comprising from about 80 to 250 g/l of sulfuric acid, at a temperature of from about 40° to 60° C. and a voltage of from about 20 to 30 V.
Claim 5
Dependent Claim
27 words
A process as claimed in claim 1, wherein said aqueous electrolyte of said first treating step comprises ≦30 g/l of a component differing from said phosphoric acid.
Claim 6
Dependent Claim
27 words
A process as claimed in claim 1, wherein said aqueous electrolyte of said second treating step comprises ≦50 g/l of a component differing from said sulfuric acid.
Claim 7
Dependent Claim
17 words
A process as claimed in claim 1, comprising the further step of post-treating said anodized support material.
Claim 8
Dependent Claim
13 words
A process as claimed in claim 6, wherein said post-treating step comprises hydrophilizing.
Claim 9
Dependent Claim
22 words
A process as claimed in claim 1, comprising the further step of abrading said support material prior to said first treating step.
Claim 10
Dependent Claim
26 words
A process as claimed in claim 1, comprising the further step of chemically, electrochemically and/or mechanically roughening said support material prior to said first treating step.
Claim 11
Dependent Claim
16 words
A process as claimed in claim 9, wherein said roughening step comprises electrochemically roughening said support.
Claim 12
Dependent Claim
19 words
A process as claimed in claim 9, wherein said roughening step comprises a combination of mechanical and electrochemical roughening.
Claim 13
Dependent Claim
19 words
A process as claimed in claim 1, wherein said anodic oxidation step comprises continuously anodically oxidizing said support material.
Claim 14
Dependent Claim
19 words
A process as claimed in claim 1, wherein said anodic oxidation step comprises discontinuously anodically oxidizing said support material.
Claim 15
Dependent Claim
59 words
A process as claimed in claim 1, wherein said aqueous electrolyte of said first treating step comprises about 100 g/l of phosphoric acid at 55° C. and at a voltage of 60 V and said aqueous electrolyte of said second treating step comprises about 250 g/l of sulfuric acid at 45° C. and at a voltage of 30 V.
Claim 16
Dependent Claim
83 words
A process as claimed in claim 1, wherein said aqueous electrolyte of said first treating step comprises from about 80 to 120 g/l of phosphoric acid, at a temperature of from about 55° to 60° C. and a voltage of from about 50-60 V, and said aqueous electrolyte of said second treating step comprises from about 130 to 250 g/l of sulfuric acid, at a temperature of from about 40° to 46° C. and a voltage of from about 27 to 30 V.
Claim 17
Dependent Claim
24 words
An offset-printing plate, comprising: an anodically oxidized support material produced by the process of claim 1; and a radiation-sensitive coating on said support material.
Claim 18
Dependent Claim
28 words
A printing plate as claimed in claim 16 wherein said support material comprises an aluminum oxide layer having a weight between about 0.5 and 10 g/m 2 .
References Cited (Backward Citations)
US3511661A
Cited
US3594289A
Cited
GB1410768A
Cited
GB1401067A
Cited
GB1495861A
Cited
US3940321A
Cited
US4211619A
Cited
EP0007234A2
Cited
EP0007233A1
Cited
US4229266A
Cited
GB2088901A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-01-27 | 1989-07-29 | 1990-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-27 | 1993-07-29 | 1994-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-27 | 1997-07-29 | 1998-01-28 | $7700.00 | Window Closed / Lapsed |