Photochromic compounds
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United States of America Patent
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Sep 2, 1980
Issued Date -
N/A
app pub date -
Oct 27, 1977
filing date -
Jul 22, 1977
priority date (Note) -
Expired
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Abstract
Photochromic compounds are disclosed which are 3-furyl or 3-thienyl alkylidene succinic anhydrides or the corresponding succinimides. The compounds undergo reversible photocyclization on exposure to U.V. light in high yield and their cyclic forms are deeply colored making them suitable for a wide range of recording and display devices.
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