High index curable photochromic composition and its process
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United States of America Patent
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Aug 23, 2005
Grant Date -
Aug 21, 2003
app pub date -
Oct 11, 2002
filing date -
Oct 12, 2001
priority date (Note) -
Expired
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Abstract
A high refractive index, curable, synthetic resin composition comprising a core resin composition composed of a mixture of ethylenically unsaturated compounds, and an initiation system containing both photo and thermal initiators, particularly a photochromic resin composition which further includes at least one photochromic dye. Also a curing process, which includes a combination of multi-step radiation curing and thermal annealing. Articles produced of cured composition exhibit superior physical and, in appropriate cases, photochromic properties and can be easily mass produced on a commercial scale due to short processing time and use of readily available chemicals.
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