Method for forming holographic foil
First Claim
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.
1 Assignment
0 Petitions
Accused Products
Abstract
A foil/composite sheet having a holographic image or diffraction grating image and a method for forming permits the party producing the final document to hot stamp a chip containing the holographic image directly on a substrate forming the major portion of the final document. The foil/composite sheet includes successively a plastic carrier film, a release coating, a hard lacquer coating, a soft lacquer coating, a layer of metal and an embossment receiving coating, the latter three of which become embossed with the holographic image when a heated embossing shim is pressed under pressure against the embossment receiving layer. A heat activatable adhesive is thereafter applied to the embossment receiving coating.
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Citations
11 Claims
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1. A method for forming a composite sheet to receive a diffraction grating image comprising the steps of:
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(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. - View Dependent Claims (2, 3)
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4. A method for forming a composite sheet with a diffraction grating image comprising the steps of:
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(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 a 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; and (g) embossing a diffraction grating image into said embossment receiving coating, said metal layer and said second lacquer coating. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11)
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Specification