| abstract |
A non-hydrophilic polymer article having a hydrophilic layer, comprises (a) a core of hydrophobic polymer of a nitrile of acrylic or methacrylic acid, an ester of acrylic acid, or an ester of methacrylic acids, (b) a relatively, thin surface layer on said article comprised of a water-swellable, water-insoluble, inert, biocompatible hydrophilic polymer characterised by a recurring unit <IMAGE> wherein R is hydrogen or methyl, and wherein A is hydrogen, alkali metal or a monovalent polyhydric group characterised by two or more primary and/or secondary hydroxyl groups and (c) said hydrophilic layer and said hydrophobic cor being chemically and integrally united. The article may be an intraocular lens or a contact lens having good optical geometry and mechanical properties. |