Photochromic compound and articles containing the same
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United States of America Patent
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Dec 20, 1988
Issued Date -
N/A
app pub date -
May 14, 1987
filing date -
Nov 28, 1986
priority date (Note) -
Expired
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Abstract
Described are photochromic spiro (oxazolidine) substituted benzoxazine photochromic compounds and their use in plastic hosts to impart a photochromic response thereto. More particularly, there are described spiro (oxazolidine) pyrido benzoxazine and spiro (oxazolidine) naphthoxazine compounds and their use in substrates such as polymerizates of allyl digylcol carbonate.
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