Photochromic polymerizable compositions
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United States of America Patent
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Feb 14, 2006
Grant Date -
Jul 24, 2003
app pub date -
Oct 16, 2002
filing date -
Nov 1, 2001
priority date (Note) -
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Abstract
Described is a polymerizable composition of a photochromic amount of at least one photochromic compound, at least one material having at least one carbonate group and at least one hydroxyl group, and at least one monoisocyanate containing material having at least one unsaturated group. The polymerizable composition optionally contains copolymerizable monomers. Also described are photochromic polymerizates, e.g., photochromic optical elements such as ophthalmic lenses, prepared from the polymerizable composition of the present invention.
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