Preparation of cross-linked hydrogel copolymers for contact lenses
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United States of America Patent
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Dec 6, 1983
Issued Date -
N/A
app pub date -
Mar 16, 1982
filing date -
Nov 30, 1978
priority date (Note) -
Expired
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Abstract
The invention relates to soft contact lenses having a water content of at least about 45% and comprising a hydrated copolymer of a major proportion of an hydroxyalkyl acrylate or methacrylate, up to 12% by weight of an ethylenically unsaturated acid or anhydride, a minor proportion of a cross-linking monomer and a minor proportion of styrene or a substituted styrene, the free acid or anhydride groups being in salt form.
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