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Security thread, a film and a method of manufacture of a security thread

  • US 5,631,039 A
  • Filed: 08/12/1994
  • Issued: 05/20/1997
  • Est. Priority Date: 08/04/1994
  • Status: Expired due to Fees
First Claim
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1. A method for manufacturing a security thread for use in security articles including security paper, said security thread comprising a polymeric substrate supporting a pattern of magnetic metal that provides a visually discernable security feature and a magnetically detectable security feature, said method comprising the steps of:

  • (a) providing a continuous polymeric web substrate,(b) applying a catalytic material comprising palladium on a surface of said web substrate in a manner that defines said pattern,(c) passing said web substrate with said pattern of catalytic material thereon through a solution containing magnetic metal comprising cobalt or cobalt alloy such that said magnetic metal will be electrolessly deposited on portions of the web substrate provided with said catalytic material so as to appear in said pattern,(d) applying a transparent protective layer over said pattern of magnetic metal, and(e) cutting said web substrate to provide said security thread.

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