Photochromic 3-pyrryl fulgides and fulgimides
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United States of America Patent
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Apr 12, 1988
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N/A
app pub date -
Jan 24, 1986
filing date -
Jan 24, 1985
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Abstract
A series of novel 3-pyrryl fulgides and fulgimides are disclosed which are photochromic. The photochromic compounds are coloured by subjecting them to irradiation in the near ultraviolet and will revert to the colourless form on exposure to visible light, especially light having a wavelength in 600 to 650 nm band.
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