Corrosion resistant silver and copper surfaces

• US 4,873,139 A
• Filed: 03/29/1988
• Issued: 10/10/1989
• Est. Priority Date: 03/29/1988
• Status: Expired due to Fees

• Current Assignee: Minnesota Mining and Manufacturing Co (3M Company)
• Original Assignee: Minnesota Mining and Manufacturing Co (3M Company)
• Inventors: Kinosky, David S.
• Primary Examiner(s): Andrews, Melvyn J.
• Assistant Examiner(s): Wyszomierski, George
• Application Number:
  US07/174,837
• Time in Patent Office: 560 Days
• Field of Search: 428/379, 428/403, 428/413, 428/419, 428/461, 428/341, 428/626
• US Class Current: 428/341
• CPC Class Codes: B05D 5/067 Metallic effect
• CPC Class Codes: C08K 5/378 containing heterocyclic rings
• CPC Class Codes: C09D 5/086 Organic or non-macromolecular compounds
• CPC Class Codes: C09D 7/48 Stabilisers against degradation by oxygen, light or heat
• CPC Class Codes: C23F 11/161 Mercaptans
• CPC Class Codes: Y10T 428/273 of coating
• CPC Class Codes: Y10T 428/31511 Of epoxy ether
• CPC Class Codes: Y10T 428/31533 Of polythioether
• CPC Class Codes: Y10T 428/31692 Next to addition polymer from unsaturated monomers

Abstract

Techniques are described for rendering silver and copper surfaces of various articles resistant to corrosion. The surfaces are contacted with compounds selected from the group consisting of 2-mercaptobenzoxazole and 1-phenyl-1H-tetrazole-5-thiol. Abrasion-resistant coatings are preferably applied to the silver and copper surfaces. The corrosion inhibiting compound may be included in the abrasion-resistant coating.

Claims

1. An article comprising a plastic film having a layer of silver supported thereon, wherein said silver layer has been contacted with a compound selected from the group consisting of 2-mercaptobenzoxazole and 1-phenyl-1H-tetrazole-5-thiol;

wherein said compound is present on said silver layer in an amount of at least about 0.001 gram per square meter; and

further comprising a film-forming coating on said silver layer.

2. An article in accordance with claim 1, wherein said coating comprises a cured resin.

3. An article having a metallic surface layer selected from the group consisting of silver and copper, said surface bearing a corrosion inhibiting layer comprising a compound selected from the group consisting of 2-mercaptobenzoxazole and 1-phenyl-1H-tetrazole-5-thiol;

and further comprising a film-forming hardenable resin layer over said corrosion inhibiting layer.

4. An article in accordance with claim 3, wherein said corrosion inhibiting layer is continuous.

5. An article in accordance with claim 3, wherein said resin is radiation-curable.

6. An article having a metallic surface comprising silver or copper, wherein said surface has been contacted with a compound consisting essentially of 2-mercaptobenzoxazole;

wherein said compound is present on said surface in an amount of at least about 0.001 gram per square meter; and

further comprising a film-forming hardenable resin layer over said surface.