Foam security substrate
Assignee3M Innovative Properties Company
InventorsChristopher K. Haas, Robert D. Taylor, William B. Black, James M. Jonza, Jay M. Jennen, David L. Vall, Roger J. Stumo
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Abstract
The present invention is directed an oriented, foamed article having an integral security element, and a method of making the article. The oriented foam article is particularly useful in the preparation of printed security documents such as currency, stock and bond certificates, birth and death certificates, land titles and abstracts and the like.
Claims22
A security substrate comprising at least one oriented, high melt-strength polypropylene foam layer comprising homo- and copolymers containing 50 weight percent or more propylene monomer units, and having a melt strength in the range of 25 to 60 cN at 190° C. and at least one security element which provides visual, tactile or electronic authentification of the security substrate or a security document derived therefrom, said foam layer having two substantially smooth major surfaces wherein the foam layer has an RA value of <10 according to ANSI B46.
Dependencies are inferred from the claim text.