Photochromic materials
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United States of America Patent
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May 4, 1993
Grant Date -
N/A
app pub date -
Feb 10, 1992
filing date -
Jun 18, 1990
priority date (Note) -
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Abstract
The photochromic material of the invention is such that a composition having an organic photochromic compound dissolved or dispersed in a hindered amine-type compound is microencapsulated. The photochromic material of the invention is not deteriorated in photochromic properties and can be used for a wide range of applications even when coloring or decolorizing repeatedly occurs on intermittent irradiation in air or when it is continuously irradiated with light for a long term.
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