Surface modification of contact lenses
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United States of America Patent
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Apr 24, 2012
Grant Date -
Aug 19, 2010
app pub date -
Feb 18, 2010
filing date -
Feb 18, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
A method of increasing the hydrophilicity of a polymer surface, such as a contact lens surface, includes exposing the polymer substrate to a first plasma under conditions selected to generate free radicals on the surface of the polymer substrate. The method also includes reacting an organic compound with the free radicals on the surface of the polymer substrate to thereby form an organic coating. The method further includes exposing the organic coating to a second plasma under conditions selected to oxidize the organic coating to thereby form a hydrophilic layer at the substrate surface. The hydrophilic layer can have a contact angle with respect to water that is less than about 50°.
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