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Optically variable multilayer structure on flexible web

  • US 5,281,480 A
  • Filed: 06/22/1992
  • Issued: 01/25/1994
  • Est. Priority Date: 12/28/1979
  • Status: Expired due to Term
First Claim
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1. In a product for producing a collection of optically variable thin film flakes adapted to be added to a liquid medium for producing a predetermined optical response to radiation incident on a surface of a solidifed version of said medium, a flexible web of material having a surface, a release coat disposed on said surface and an optically variable multilayer structure disposed on said release coat on said web and comprising at least two metal layers with at least one being opaque and at least one being semi-transparent and at least one dielectric layer with an index of refraction of 1.65 or less to provide a color shift between two distinct colors at first and second angles of incident light.

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