Fast curing polymeric compositions for ophthalmic lenses and apparatus for preparing lenses
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United States of America Patent
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Mar 9, 1999
Issued Date -
N/A
app pub date -
Jan 11, 1995
filing date -
May 1, 1989
priority date (Note) -
Expired
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Abstract
A polymerizable composition for the production of high quality ophthalmic lenses is disclosed that includes: a) between 20 and 90 weight percent, and preferably, at least 50 weight percent, of urethane, epoxy, or polyester oligomers end terminated with acrylate or methacrylate (or mixtures of acrylate and methacrylate); b) between 5 and 50 to 80 percent, preferably between 10 and 40 percent, by weight of an optional diluent, such as a hydrocarbon diol end terminated with acrylate or methacrylate, or mixtures thereof, or a crosslinkable tri-, tetra-, or poly-acrylate or methacrylate, or mixtures thereof; and c) conventional optional additives, including but not limited to free radical initiators, UV absorbers, mold release agents, stabilizers, dyes, antioxidants, and wetting agents. The invention also includes ophthalmic lenses prepared from this composition and an apparatus for the production of lenses using sequential polymerization.
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