Patent US4542089A successfully refreshed from Google Patents.
US4542089A
Expired / Lapsed
US
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Lithographic substrate and its process of manufacture
Assignee: 3M Co
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Filing: 1984-04-09
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Granted: 1985-09-17
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Expires: 2004-04-09
Abstract
Abstract Lithographic printing substrates ordinarily require a mechanical or chemical graining of aluminum surfaces. Such substrates are difficult and expensive to make. It has been found that lithographically suitable substrates can be prepared by the firing of monobasic phosphate solutions with dispersed particles therein. The presence of reactive metallic oxides enhances the properties of the surface.
Inventors
- 👤 Donald E. Cadwell
- 👤 Larry A. Brey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:24
CPC Classifications
B; B41; B41N; B41N3/00; B41N3/03; B41N1/00; B41N1/006
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
105 words
A process for preparing a photosensitive substrate comprising the steps of A. Providing a hydrophilic ceramic on an aluminum substrate or aluminized surface of a substrate which comprises applying a slurry of at least one monobasic phosphate and inorganic non-metallic particles on at least one surface of the aluminum or aluminized substrate and firing the slurry at a temperature of at least 230° C. for a time sufficiently long to insure substantially complete dehydration of the ceramic layer to form a hydrophilic ceramic coating on said aluminum substrate or aluminized surface of a substrate; B. Coating on said ceramic layer an organic photosensitive lithographic layer.
Claim 2
Dependent Claim
105 words
A process for preparing a photosensitive substrate comprising the steps of A. Providing a hydrophilic ceramic on an aluminum substrate or aluminized surface of a substrate which comprises applying a slurry of at least one monobasic phosphate and inorganic non-metallic particles on at least one surface of the aluminum or aluminized substrate and firing the slurry at a temperature of at least 230° C. for a time sufficiently long to insure substantially complete dehydration of the ceramic layer to form a hydrophilic ceramic coating on said aluminum substrate or aluminized surface of a substrate; B. Coating on said ceramic layer an organic photosensitive lithographic layer.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein a calcium-containing compound is included in the slurry.
Claim 4
Dependent Claim
21 words
The process of claim 2 wherein said calcium-containing compound is calcium hydroxide, calcium carbonate, calcium oxide, calcium phosphate, or mixtures thereof.
Claim 5
Dependent Claim
22 words
The process of claim 1 wherein said particles comprise metal oxide particles having average sizes of from 1×10 -3 to 45 micrometers.
Claim 6
Dependent Claim
25 words
The process of claim 4 wherein said monobasic phosphate is formed in situ during firing by the reaction of phosphoric acid with a tribasic phosphate.
Claim 7
Dependent Claim
26 words
The process of claim 4 wherein said monobasic phosphate is formed in situ during firing by the reaction of phosphoric acid with alumina and/or aluminum hydroxide.
Claim 8
Dependent Claim
30 words
The process of claim 4 wherein said monobasic phosphate is formed in situ during firing by the reaction of alumina with a monobasic phosphate not consisting essentially of monoaluminum phosphate.
Claim 9
Dependent Claim
16 words
The process of claim 4 wherein only a portion of the metal oxide particles comprise magnesia.
Claim 10
Dependent Claim
13 words
The process of claim 4 wherein said metal oxide comprises reactive alumina particles.
Claim 11
Dependent Claim
16 words
The process of claim 9 wherein said metal oxide particles further additionally comprise alpha alumina particles.
Claim 12
Dependent Claim
18 words
The process of claim 10 wherein said ceramic coating has a thickness of between 0.2 and 15 micrometers.
Claim 13
Dependent Claim
35 words
The process of claim 4 wherein said metal oxide particles comprise a reactive alumina and a metal oxide, the orthophosphate of which oxide is insoluble in an aqueous solution having a pH of from 6-12.
Claim 14
Dependent Claim
28 words
The process of claim 12 wherein said ceramic coating comprises alumina particles bound into an amorphous phase by one or more of the polymorphic forms of aluminum orthophosphate.
Claim 15
Dependent Claim
18 words
The process of claim 12 wherein said ceramic coating has a thickness of between 0.2 and 15 micrometers.
Claim 16
Dependent Claim
23 words
The process of claim 4 wherein firing is at a temperature of at least 260° C. to form a dehydrated grained ceramic coating.
Claim 17
Dependent Claim
48 words
The process of claim 15 wherein the slurry comprises about 5 to about 15 percent by volume of materials that are not volatile upon firing, at least 35 percent by volume of said nonvolatile materials being a matrix comprising phosphates and reactive metal oxides and/or reactive metal hydroxides.
Claim 18
Dependent Claim
18 words
The process of claim 16 wherein said ceramic coating has a thickness of between 0.5 and 5 micrometers.
Claim 19
Dependent Claim
29 words
The process of claim 16 wherein said slurry contains a metal oxide, the orthophosphate of which oxide is insoluble in an aqueous solution having a pH of from 6-12.
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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) | 1988-09-16 | 1989-03-18 | 1989-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-16 | 1993-03-18 | 1993-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-16 | 1997-03-18 | 1997-09-17 | $7700.00 | Window Closed / Lapsed |