Birefringent azo dye polymer erasable optical storage medium
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United States of America Patent
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Jan 24, 1995
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app pub date -
Apr 21, 1993
filing date -
Dec 12, 1990
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Abstract
An optical storage medium including a transparent polymer and an isomerizable AZO dye, the optical storage medium being coated as a water miscible solution on a substrate so as to form a film having a thickness of from .mu.m to 100 .mu.m storing information through birefringence and having a diffraction efficiency greater than 40% at a 1 millisecond response time. The isomerizable AZO dye remains in the film and is present in a concentration of from 4.5% to 25% based on the weight of the film.
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