Interlaminar sandwich with diffraction structure

Details Interlaminar sandwich with diffraction structure Interlaminar sandwich with diffraction structure

1990-11-27

1992-04-14

Ryan, Patrick J.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

428198, 428209, 428336, 4284231, 428480, 428447, 428915, 428916, 283 85, 283 86, 283 87, 283 91, 283904, B32B 900, B44C 1165

Patent

active

051044714

ABSTRACT:
An interlaminar sandwich comprises first and second lacquer layers, a diffraction structure embedded between the first and second lacquer layers, a heat activated adhesive layer disposed one one of the lacquer layers, and a transparent stabilization layer disposed over the other lacquer layer, the stabilization layer distributing heat evenly through the interlaminar sandwich so that when heat is applied to the stabilization layer, the adhesive layer will bond the interlaminar sandwich to a substrate. Preferably, the interlaminar sandwich also contains an intermediary layer between the stabilization layer and the first lacquer layer which bonds these layers together. At temperatures below 170.degree. C., the adhesive layer is bonded so intimately to the substrate that the interlaminar sandwich cannot be removed from the substrate without tearing it. At temperatures above 150.degree. C., the lacquer layers soften, thus destroying the diffraction structure. After being built up on a film, the interlaminar sandwich can be punched out in the form of a tag and attached to an identification document thereby protecting the document against attempts to remove the tag.

REFERENCES:
patent: 4057919 (1977-11-01), Gauch et al.
patent: 4184700 (1980-01-01), Greenaway
patent: 4250217 (1981-02-01), Greenaway
patent: 4304809 (1981-12-01), Moraw et al.
patent: 4556378 (1985-12-01), Nyfeler et al.
patent: 4629647 (1986-12-01), Sander
patent: 4717615 (1988-01-01), Reinhart
patent: 4728377 (1988-03-01), Gallagher

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