Photochromic naphthopyran compounds: compositions and articles containing those naphthopyran compounds
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United States of America Patent
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Mar 7, 2006
Grant Date -
Aug 7, 2003
app pub date -
Nov 20, 2001
filing date -
Nov 20, 2001
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Abstract
A photochromic naphthopyran displays good color distribution when the naphthopyran has a central nucleus of the formula: ##STR1## wherein F is a 5-member, 6-member, or 7-member heterocyclic ring group having only one heteroatom, the heteroatom selected from the group consisting of oxygen, sulfur, and nitrogen, the 2,3 or 3,2 positions of the heterocyclic ring fused to the g, h, or i side; R1 and R2 are the atoms or groups providing photochromic properties to the naphthopyran.
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