Photochromic naphtho [2,1-b]pyran compounds containing bithienyl or terthienyl substituents, process for their manufacture, and photochromic materials and articles obtained
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United States of America Patent
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Nov 6, 2001
Grant Date -
N/A
app pub date -
Jul 8, 1999
filing date -
Jul 8, 1999
priority date (Note) -
Expired
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Abstract
The photochromic compounds of the invention correspond to the formula: ##STR1## in which Th.sub.2 represents a bithienyl group in one of the positions 5 to 10 of the naphthenic ring system system, R.sup.1 denotes a bithienyl or trithienyl group and R.sup.2 denotes a bithienyl, trithienyl, aryl, naphthyl, thienyl, furyl, pyrrolyl or N-alkylpyrrolyl group.
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