Mixtures of polyacrylate resins and siloxane-styrene copolymers
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United States of America Patent
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Oct 29, 1985
Issued Date -
N/A
app pub date -
Jan 13, 1983
filing date -
Mar 22, 1982
priority date (Note) -
Expired
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Abstract
Optically clear lenses, particularly contact lenses, may be prepared from an alloy of a polyacrylate resin and a siloxane-styrene copolymer, the alloy having an oxygen permeability greater than the polyacrylate resin. Preferably the polyacrylate is polymethylmethacrylate or methylacrylate-ethylacrylate copolymer, and the siloxane-styrene copolymer is preferably a polydimethylsiloxane-alpha-methylstyrene block copolymer. The alloy composition may be produced by melt mixing, preferably by polymerizing acrylate monomers in the presence of siloxane-styrene copolymer.
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