| 摘要 |
Cross-linked copolymers which are obtainable by polymerizing a neutral diluent monomer or monomers, a monomer or monomers bearing a center of permanent positive charge, and a bifunctional and/or trifunctional cross-linking agent, are suitable for use in contact lenses. Process for producing them by copolymerization, contact lens material comprising them, contact lenses made of them and processes for producing contact lenses from them.
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