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Method for forming holographic foil

  • US 5,810,957 A
  • Filed: 03/26/1997
  • Issued: 09/22/1998
  • Est. Priority Date: 04/04/1994
  • Status: Expired due to Fees
First Claim
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1. A method for forming a composite sheet to receive a diffraction grating image comprising the steps of:

  • (a) providing a film of plastic material;

    (b) applying a release coating onto said film, said release coating having a thickness in the range of 0.025 microns to 5 microns;

    (c) applying a first lacquer coating onto said release coating, said first lacquer having a thickness in the range of 0.5 microns to 5 microns and a softening point as measured by a glass transition temperature of at least 80°

    C.;

    (d) applying a second lacquer coating onto said first lacquer coating, said second lacquer coating having a thickness in the range of 0.5 microns to 5 microns and having softening point as measured by a glass transition temperature no higher than 70°

    C.;

    (e) depositing on said second lacquer coating a layer of metal having a thickness in the range of 20 millimicrons to 100 millimicrons; and

    (f) applying to said metal layer an embossment receiving coating having a thickness in the range of 0.025 microns to 1 micron, said embossment receiving coating being an esterfied montan wax.

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