Oxygen permeable hard and semi-hard contact lens compositions, processes for their preparation, contact lenses and their manufacture from such compositions.

摘要

The invention relates to novel monomers of polysiloxanyl alkyl esters of acrylic and methacrylic acids and its copalymerization with alkyl esters of acrylic, methacrylic acids and/or itaconate esters to produce highly oxygen permeable contact lens material. The copolymer preferably includes a cross-linking agent and hydrophilic monomer. Contact lenses manufactured from the material are easily machined and polished into hard or semi-hard contact lenses having excellent dimensional stability.