Coated aluminum substrates

• US 3,975,197 A
• Filed: 01/06/1975
• Issued: 08/17/1976
• Est. Priority Date: 02/12/1973
• Status: Expired due to Term

• Current Assignee: 3M Company
• Original Assignee: 3M Company
• Inventors: Mikelsons, Valdis
• Primary Examiner(s): Kendall, Ralph S.
• Application Number:
  US05/538,928
• Time in Patent Office: 589 Days
• Field of Search: 96/86 R, 96/86 P, 96/1.5, 96/1, 96/67, 148/6.27, 148/6.3, 148/6.2
• US Class Current: 430/525
• CPC Class Codes: B41N 3/03 Chemical or electrical pretreatment
• CPC Class Codes: G03C 1/705 Compositions containing chalcogenides, metals or alloys thereof, as photosensitive substances, e.g. photodope systems used as photoresist G03F7/004
• CPC Class Codes: G03G 5/085 and being incorporated in an inorganic bonding material, e.g. glass-like layers
• CPC Class Codes: G11B 5/73913 Composites or coated substrates
• CPC Class Codes: G11B 5/73919 Aluminium or titanium elemental or alloy substrates
• CPC Class Codes: Y10T 428/12097 Nonparticulate component encloses particles
• CPC Class Codes: Y10T 428/25 Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
• CPC Class Codes: Y10T 428/253 Cellulosic [e.g., wood, paper, cork, rayon, etc.]
• CPC Class Codes: Y10T 428/256 Heavy metal or aluminum or compound thereof
• CPC Class Codes: Y10T 428/257 Iron oxide or aluminum oxide
• CPC Class Codes: Y10T 428/258 Alkali metal or alkaline earth metal or compound thereof
• CPC Class Codes: Y10T 428/259 Silicic material

Abstract

Aluminum substrates are provided having a coating of particulate material bound thereto by means of an in situ formed binder of aluminum hydroxyoxide. The coated aluminum constructions have utility in imaging and reproduction processes (e.g., as printing plates, as electrographic elements, etc.), as magnetic recording surfaces, controlled roughness surfaces, decorative panels, protective surfaces, etc.

Claims

1. An article suitable for providing a lithographic plate comprising an aluminum substrate, a hydrophilic coating overlying said aluminum substrate, said coating being provided by a hydrophilic particulate material bound to said aluminum substrate by an in situ formed aluminum hydroxyoxide, and an oleophilic layer overlying said hydrophilic coating, wherein said particulate material has an average particle size of about 0.05 to 3000 microns, a melting point above about 150°

C., and a water solubility of less than about 0.1 part per 100 parts of water at 100°

C.

2. The article of claim 1 wherein said oleophilic layer is provided by a polymeric material.

3. The article of claim 1 wherein a photosensitive layer is disposed between said hydrophilic layer and said oleophilic layer, said photosensitive layer having one solubility in relation to a developing medium before exposure to actinic radiation and another solubility in relation to said developing medium after exposure to actinic radiation, whereby said oleophilic layer can be selectively removed by said developing medium to provide an exposed pattern of oleophilic layer and hydrophilic layer conforming to the pattern to be reproduced.