US4324841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lithographic substrates
Assignee: Kodak Graphics Holding Inc
•
Filing: 1980-08-15
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Granted: 1982-04-13
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Expires: 2000-08-15
Abstract
Abstract A method for the production of aluminum substrates useful in the production of lithographic printing plates which comprises mechanically graining the surface of an aluminum sheet, subsequently finely graining the mechanically grained sheet in a saturated solution of an aluminum salt of a mineral acid to which up to 10% of a mineral acid has been added, with discretional electrolysis, and then optionally anodizing the sheet.
Inventors
- 👤 Jen-Chi Huang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:17
CPC Classifications
B; B41; B41N; B41N3/00; B41N3/03; B41N3/034; Y; Y10; Y10S; Y10S428/00; Y10S428/908; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
65 words
An aluminum sheet provided with at least one surface suitable for lithography by a method which comprises the steps of: a. mechanically graining said surface; and, b. immersing said aluminum sheet in a saturated aqueous solution of an aluminum salt of a mineral acid for a period of time from about 5 seconds to about 5 minutes at about 25° C. to about 110° C.
Claim 2
Dependent Claim
65 words
An aluminum sheet provided with at least one surface suitable for lithography by a method which comprises the steps of: a. mechanically graining said surface; and, b. immersing said aluminum sheet in a saturated aqueous solution of an aluminum salt of a mineral acid for a period of time from about 5 seconds to about 5 minutes at about 25° C. to about 110° C.
Claim 3
Dependent Claim
13 words
The sheet of claim 1 wherein said aluminum is electrolyzed in said solution.
Claim 4
Dependent Claim
20 words
The sheet of claim 1 wherein said solution further comprises up to about 10% by weight of a mineral acid.
Claim 5
Dependent Claim
28 words
The sheet of claim 3 wherein said acid is selected from the group consisting of hydrochloric acid, sulfuric acid, phosphoric acid, boric acid, nitric acid and acetic acid.
Claim 6
Dependent Claim
18 words
The sheet of claim 3 wherein said acid is hydrochloric acid and said aluminum salt is aluminum chloride.
Claim 7
Dependent Claim
26 words
The sheet of claim 3 wherein the time of immersion ranges from about 5 to about 120 seconds at from about 50° C. to 80° C.
Claim 8
Dependent Claim
13 words
The sheet of claim 4 wherein the aluminum is electrolyzed in said solution.
Claim 9
Dependent Claim
30 words
The sheet of claim 1 or 3 wherein said aluminum salt is selected from the group consisting of one or more of aluminum chloride, sulfate, phosphate, borate, acetate and nitrate.
Claim 10
Dependent Claim
26 words
The sheet of claim 1 or 3 wherein said mechanical graining step comprises abrading the aluminum surface with a wire brush or an aqueous pumice slurry.
Claim 11
Dependent Claim
18 words
A lithographic printing plate which comprises a photosensitive coating applied to the sheet of claim 1 or 3.
Claim 12
Dependent Claim
20 words
The sheet prepared by the method of claim 1 or 3 further comprising the subsequent step of anodizing said sheet.
Claim 13
Dependent Claim
18 words
The sheet of claim 10 wherein said anodizing is conducted in an electrolyte comprising sulfuric or phosphoric acid.
Claim 14
Dependent Claim
29 words
The sheet of claim 3 wherein the time of immersion is 20 seconds at 70° C., and the solution is a saturated aluminum chloride solution containing 5% hydrochloric acid.
Claim 15
Dependent Claim
19 words
The sheet of claim 13 wherein the mechanical graining step comprises abrading the aluminum surface with a wire brush.
Claim 16
Dependent Claim
20 words
The sheet of claim 13 wherein the mechanical graining step comprises abrading the aluminum surface with an aqueous pumice slurry.
Claim 17
Dependent Claim
89 words
An aluminum sheet provided with at least one surface suitable for lithography by a method which comprises the steps of, a. mechanically graining said surface by abrading with a wire brush or aqueous pumice slurry; b. immersing said aluminum sheet in a saturated aqueous solution of aluminum chloride, sulfate, phosphate, borate, acetate or nitrate for a period of time from about 5 seconds to about 5 minutes at from about 25° C. to about 110° C.; and, c. anodizing said sheet in an electrolyte comprising sulfuric or phosphoric acid.
Claim 18
Dependent Claim
89 words
An aluminum sheet provided with at least one surface suitable for lithography by a method which comprises the steps of, a. mechanically graining said surface by abrading with a wire brush or aqueous pumice slurry; b. immersing said aluminum sheet in a saturated aqueous solution of aluminum chloride, sulfate, phosphate, borate, acetate or nitrate for a period of time from about 5 seconds to about 5 minutes at from about 25° C. to about 110° C.; and, c. anodizing said sheet in an electrolyte comprising sulfuric or phosphoric acid.
Claim 19
Dependent Claim
21 words
The aluminum sheet of claim 16 wherein the immersion solution further comprises up to 10% by weight of a mineral acid.
Claim 20
Dependent Claim
57 words
The aluminum sheet of claim 17 wherein step (a) is conducted with an aqueous pumice slurry or a wire brush and, step (b) is conducted in a saturated aluminum chloride solution containing up to 10% by weight of hydrochloric acid at a temperature of about 25° C. to 110° C. for about 5 seconds to 5 minutes.
Claim 21
Dependent Claim
32 words
The aluminum sheet of claim 18 wherein the concentration of hydrochloric acid is 2 to 5% wt., and the immersion time is 5 to 20 seconds at 50° C. to 80° C.
Claim 22
Dependent Claim
25 words
The aluminum sheet of claim 19 wherein the concentration of hydrochloric acid is 5% wt. and the immersion time is 20 seconds at 70° C.
Claim 23
Dependent Claim
59 words
The sheet produced according to the method of any one of claims 1, 16 or 17 further comprising the subsequent steps of, d. applying to said surface an interlayer composition comprising alkali metal silicate, silicic acid, Group IV-B metal fluorides, polyacrylic acid, the alkali zirconium fluorides or hydrofluozirconic acid; and, e. applying a photosensitive composition to said interlayer composition.
Claim 24
Dependent Claim
23 words
A lithographic printing plate which comprises a photosensitive composition applied to the sheet of any one of claims 16 and 17 to 21.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-04-12 | 1985-10-12 | 1986-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-12 | 1989-10-12 | 1990-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-12 | 1993-10-12 | 1994-04-13 | $7700.00 | Window Closed / Lapsed |