Process for a two-stage hydrophilizing post-treatment of aluminum oxide layers with aqueous solutions and use thereof in the manufacture of supports for offset printing plates
First Claim
1. A process for manufacturing a roughened and anodically oxidized aluminum or aluminum alloy substrate, comprising the steps of:
- (a) treating an aluminum oxide layer carried on a substrate comprised of aluminum or aluminum alloy in a first aqueous solution containing an alkali metal silicate; and
then(b) treating said aluminum oxide layer(b) treating said aluminum oxide layer in a second aqueous solution containing at least one organic polymer comprised of at least one from the group consisting of vinylphosphonic acid monomers and vinylmethylphosphinic acid monomers.
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Accused Products
Abstract
The process for manufacturing materials, in the form of sheets, foils or webs, comprised of chemically, mechanically and/or electrochemically roughened and anodically oxidized aluminum or an aluminum alloy, which process is performed with two hydrophilizing post-treatment steps. In post-treatment step (a) a supported aluminum oxide layer is treated with an aqueous alkali metal silicate solution which optionally contains alkaline earth metal ions, and in step (b) the aluminum oxide layer is separately treated with an aqueous solution containing at least one organic polymer comprised of vinylphosphonic acid and/or vinylmethylphosphinic acid monomers, such as polyvinylphosphonic acid. Treatment of the aluminum oxide layer is accomplished by means of immersion and/or electrochemically. Materials prepared by this process are particularly useful as supports for offset printing plates, showing an improved resistance to alkali and a reduced tendency to adsorb dyestuff.
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Citations
16 Claims
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1. A process for manufacturing a roughened and anodically oxidized aluminum or aluminum alloy substrate, comprising the steps of:
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(a) treating an aluminum oxide layer carried on a substrate comprised of aluminum or aluminum alloy in a first aqueous solution containing an alkali metal silicate; and
then(b) treating said aluminum oxide layer (b) treating said aluminum oxide layer in a second aqueous solution containing at least one organic polymer comprised of at least one from the group consisting of vinylphosphonic acid monomers and vinylmethylphosphinic acid monomers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification