Polymer materials with latent images visible in polarized light

Details Polymer materials with latent images visible in polarized light Polymer materials with latent images visible in polarized light

1997-10-20

2000-09-26

Spyrou, Cassandra

Optical: systems and elements

Polarization without modulation

Polarization by reflection or refraction

283 90, G02B 2728, B42D 1500

Patent

active

06124970&

ABSTRACT:
An authenticatable product includes a non-opaque latent image layer of polymer material treated so as to contain at least one region having anisotropic optical properties such that, when viewed directly, the at least one region is indistinguishable from the remainder of the latent image layer and, under polarized visualization, the at least one region is distinguished readily from the remainder of the latent image layer. The latent image layer may be supplemented with visible information, a reflective layer, a quarterwave plate, a polarizer, or may be part of a more complex multi-layer structure. The product may be used in a wide range of authentification applications. Also described is a method for producing such a latent image including steps of photoactivation, selective exposure and processing/fixing of the image.

REFERENCES:
patent: 3313052 (1967-04-01), Malster
patent: 3313941 (1967-04-01), Marks
patent: 3391479 (1968-07-01), Buzzell et al.
patent: 3610120 (1971-10-01), Morse et al.
patent: 3683764 (1972-08-01), Johnson
patent: 3827726 (1974-08-01), McVoy et al.
patent: 4175775 (1979-11-01), Kruegle
patent: 4659112 (1987-04-01), Reiner et al.
patent: 4974941 (1990-12-01), Gibbons et al.
patent: 5004327 (1991-04-01), Rosen
patent: 5033829 (1991-07-01), Faroughy
patent: 5059776 (1991-10-01), Antes
patent: 5262882 (1993-11-01), Hikmet
patent: 5284364 (1994-02-01), Jain
patent: 5389698 (1995-02-01), Chigrinov et al.
patent: 5427828 (1995-06-01), Park
patent: 5434687 (1995-07-01), Kawata et al.
patent: 5602661 (1997-02-01), Schadt et al.
Vannikov et al, "New Photochromic Materials for Visible Range", SPIE, 2722: 252-254, 1996.
Leage et al, "Photoinduced Phase Transitions in Novel Liquid-crystalline Copolymers", J. Mater. Chem., 1(2): 303-304, 1991.

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