Photosensitive elements based on polymeric matrices of diacetyle

Details Photosensitive elements based on polymeric matrices of diacetyle Photosensitive elements based on polymeric matrices of diacetyle

1989-09-22

1992-03-24

Hamilton, Cynthia

Radiation imagery chemistry: process, composition, or product th

Imaged product

Antifraud or antitampering

430339, 430345, 522 14, 522 16, 522 25, 522181, G03C 300

Patent

active

050988069

ABSTRACT:
Rapid changes in absorption are made within the volume of a photosensitive transparent member that absorbs incident radiation to prevent the photocopy of a document, the original transparency being restored after discontinuance of the incident radiation.

REFERENCES:
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patent: 4905202 (1990-02-01), Robillard
C. Smets et al., "Photochromic Polymers and Their Solution Behavior", Polymer Preprints (American Chemical Society, Div. Polym. Chem.) 9 (1968) pp. 211-217.
Hay et al., "Photosensitization of Polyacetylenes", J. of Polymer Science: Part A-1, vol. 8 (1970) pp. 1022-1023.

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