Rigid contact lenses with improved oxygen permeability

Details Rigid contact lenses with improved oxygen permeability Rigid contact lenses with improved oxygen permeability

C - Chemistry, Metallurgy

08

G

C08G 77/20 (2006.01) B29D 11/00 (2006.01) C08F 290/06 (2006.01) C08F 290/14 (2006.01) G02B 1/04 (2006.01) G02C 7/04 (2006.01)

Patent

CA 2058896

Hard polymers with extremely high oxygen permeability are described, which consist of the copolymerization product of 1-15 % by weight of a poly-(dimethylsiloxane) bearing multiple polymerizable vinyl groups and having a number-average molecular weight M n of 1000-8000, 20-50 % of an oligosiloxanylalkyl (meth)acrylate, 25-50 % of an at least three fluorine atoms containing vinyl-monomer, 0-30 % of copolymerizable monomers which by themselves as homo- or copolymers have a Shore-D hardness of at least 85, 1-25 % of polyvinyl-crosslinking monomer of 100-1000 molecular weight, and 0- 15 % of a watersoluble, copolymerizable monomer. The novel polymers combine a Shore-D hardness of 70-85 with an oxygen permeability of 40-90 barrers, making them outstanding materials for the manufacture and use as rigid, gas-permeable contact lenses.

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