Packaging film with a transparent barrier coating

Details Packaging film with a transparent barrier coating Packaging film with a transparent barrier coating

1990-06-28

1991-12-10

Herbert, Thomas J.

Stock material or miscellaneous articles

Composite

Of metal

156150, 428 43, B32B 1508

Patent

active

050717103

ABSTRACT:
A process for coating a packaging film with a transparent barrier coating. The process starts with a metal substrate made of, or having a surface coating of, a valve metal or valve metal alloy. The metal substrate is anodized to form an anodic film of the valve metal on the metal substrate. The anodic film is made readily detachable from the metal by carrying out the anodization step in the presence of an adhesion-reducing agent, e.g. a fluoride. The packaging film is then attached to the anodic film and the anodic film is detached from the metal. The transferred anodic film forms a thin dense oxide coating on the packaging film that acts as a barrier against oxygen and moisture transparent. The invention can be used for making packaging films suitable for packaging foodstuffs, and the like.

REFERENCES:
patent: 4190315 (1980-02-01), Brettle et al.
patent: 4702963 (1987-10-01), Phillips et al.
patent: 4837061 (1989-06-01), Smits et al.

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