Photochromic compositions and articles comprising siloxane, alkylene or substituted alkylene oligomers
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United States of America Patent
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Issued Date -
Aug 16, 2007
app pub date -
Apr 29, 2005
filing date -
Apr 30, 2004
priority date (Note) -
Abandoned
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Abstract
This invention relations to a polymerizable composition for forming a photochromic article of glass transition temperature of at least 50 .degree. C. on curing, the composition comprising: (a) a polymerizable composition comprising a monomer component or resin formed therefrom; and (b) a photochromic dye monomer comprising a photochromic moiety and at least one oligomeric group having at least one group reactive with the monomer component during or following curing wherein the oligomer group comprises a multiplicity of monomer units selected from siloxane, alkylene and substituted alkylene.
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