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US4655136A Expired / Lapsed US ⏱️ 0.0 years remaining

Sheet material of mechanically and electrochemically roughened aluminum, as a support for offset-printing plates

Assignee: Hoechst AG
•
Filing: 1984-02-06
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Granted: 1987-04-07
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Expires: 2004-02-06
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Abstract

Abstract Disclosed is a sheet, foil or strip material comprising aluminum or an alloy thereof, which is first mechanically and then electrochemically roughened on one or both surfaces to produce the following parameters: (a) from about 60 to 90% of the surface comprise a basic structure, in which the arithmetic mean of the distribution of diameters D a1 of the pits is in the range from about 1 to 5 microns, (b) from about 10 to 40% of the surface comprise a superimposed structure formed of elevations having an average base F from about 100 to 1,500 microns 2 , in which the arithmetic mean of the distribution of diameters D a2 of the pits is in the range from about 0.1 to 1.0 micron, (c) the center line average roughnesses R a of the entire surface are at least 0.6 micron, and (d) the contact area t pmi of the entire surface is not more than about 20% at a stylus working depth of 0.125 micron and not more than about 70% at a stylus working depth of 0.4 micron. Also disclosed is a process for the production of this material and offset-printing plates which comprise a layer of this material provided with a radiation-sensitive coating.

Inventors

  • 👤 Kurt Reiss
  • 👤 Walter Niederstatter
  • 👤 Joachim Stroszynski
  • 👤 Dieter Bohm
  • 👤 Gerhard Sprintschnik

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-25 02:25
CPC Classifications
B; B41; B41N; B41N3/00; B41N3/04; B41N3/03; B41N3/034; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12993

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 140 words
A support material in the form of a sheet, a foil or a strip comprising aluminum or an alloy thereof, which has been first mechanically roughened and then electrochemically roughened on one or both surfaces, said aluminum support comprising a first structure comprising about 60-90% of the support surface, which includes a plurality of pits in which the arithmetic means of the distribution of pit diameters D a1 is in the range from about 1 to 5 microns, and a second structure, raised in relation to said first structure, having an average base F from about 100 to 1500 microns 2 and comprising about 10-40% of the support surface, said second structure including a plurality of pits in which the arithmetic mean of the distribution of pit diameters D a2 is in the range from about 0.1 to 1 micron.
Claim 2
Dependent Claim 140 words
A support material in the form of a sheet, a foil or a strip comprising aluminum or an alloy thereof, which has been first mechanically roughened and then electrochemically roughened on one or both surfaces, said aluminum support comprising a first structure comprising about 60-90% of the support surface, which includes a plurality of pits in which the arithmetic means of the distribution of pit diameters D a1 is in the range from about 1 to 5 microns, and a second structure, raised in relation to said first structure, having an average base F from about 100 to 1500 microns 2 and comprising about 10-40% of the support surface, said second structure including a plurality of pits in which the arithmetic mean of the distribution of pit diameters D a2 is in the range from about 0.1 to 1 micron.
Claim 3
Dependent Claim 47 words
A support material as claimed in claim 1, wherein D a1 is in the range from about 2 to 4 microns and, D a2 is in the range from about 0.3 to 0.8 micron, at an average base F from about 200 to 1,200 microns 2 .
Claim 4
Dependent Claim 26 words
A material as claimed in claim 1, wherein the surface of the material additionally comprises an aluminum oxide layer which has been generated by anodic oxidation.
Claim 5
Dependent Claim 26 words
A material as claimed in claim 2, wherein the surface of the material additionally comprises an aluminum oxide layer which has been generated by anodic oxidation.
Claim 6
Dependent Claim 19 words
A material as claimed in claim 3, wherein the aluminum oxide layer has been post-treated to render it hydrophilic.
Claim 7
Dependent Claim 19 words
A material as claimed in claim 4, wherein the aluminum oxide layer has been post-treated to render it hydrophilic.
Claim 8
Dependent Claim 27 words
An offset printing plate comprising a support member comprised of the material as claimed in claim 1, having a radiation-sensitive coating on at least one side thereof.
Claim 9
Dependent Claim 17 words
An offset printing plate as claimed in claim 7, wherein said radiation-sensitive coating comprises a positive-working composition.

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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) 1990-04-06 1990-10-06 1991-04-07 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1994-04-06 1994-10-06 1995-04-07 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1998-04-06 1998-10-06 1999-04-07 $7700.00 Window Closed / Lapsed

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