Lens or semi-finished blank comprising photochromic resin compositions
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United States of America Patent
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Jun 22, 1999
Grant Date -
N/A
app pub date -
Dec 5, 1996
filing date -
Dec 5, 1996
priority date (Note) -
Expired
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Abstract
A resin is provided comprising a mixture of at least two polymerizable components, at least one photochromic additive, at least one additive and at least one polymerization initiator. The mixture of at least two polymerizable components is preferably selected from monofunctional, difunctional and multifunctional acrylates and methacrylates. The photochromic additive is preferably selected from spirooxazine additives and spiropyran additives. And the additive is preferably selected from antioxidants, radical scavengers and ultraviolet absorbers.
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