Polysiloxane with polycyclic modifier composition and biomedical devices
First Claim
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1. A shaped article suitable for use in biomedical applications being a polymer formed by polymerizing (a) one or more polysiloxane monomers α
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terminally bonded through divalent hydrocarbon groups to an activated unsaturated group with (b) a polycyclic modulus modifier and (c) a tear film stabilizer to form a crosslinked three-dimensional polymeric network,said modulus modifier being selected from the group consisting of isobornyl acrylate, isobornyl methacrylate, dicyclopentandienyl acrylate, dicyclopentadienyl methacrylate, adamantanyl acrylate, adamantanyl methacrylate, isopinocamphyl acrylate and isopinocamphyl methacrylate and is present in an amount from 90 to 30 parts per 10 to 70 parts of polysiloxane monomers and the sum of parts equals 100,said stabilizer being selected from the group consisting of hydroxyethylmethacrylate, hydroxyethylacrylate, hydroxypropylmethacrylate, hydroxypropylacrylate and mixtures thereof and is present in an amount from 2 to 20 parts per 100 parts of modulus modifier and polysiloxane monomers,said polymer having a flexural modulus of at least 1,500 Kg/cm2.
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Abstract
Monomeric polysiloxanes endcapped with activated unsaturated groups are copolymerized with polycyclic modulus modifiers and tear film stabilizers to form hard, gas permeable, polysiloxane contact lenses and other biomedical devices.
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17 Claims
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1. A shaped article suitable for use in biomedical applications being a polymer formed by polymerizing (a) one or more polysiloxane monomers α
- ,ω
terminally bonded through divalent hydrocarbon groups to an activated unsaturated group with (b) a polycyclic modulus modifier and (c) a tear film stabilizer to form a crosslinked three-dimensional polymeric network,said modulus modifier being selected from the group consisting of isobornyl acrylate, isobornyl methacrylate, dicyclopentandienyl acrylate, dicyclopentadienyl methacrylate, adamantanyl acrylate, adamantanyl methacrylate, isopinocamphyl acrylate and isopinocamphyl methacrylate and is present in an amount from 90 to 30 parts per 10 to 70 parts of polysiloxane monomers and the sum of parts equals 100, said stabilizer being selected from the group consisting of hydroxyethylmethacrylate, hydroxyethylacrylate, hydroxypropylmethacrylate, hydroxypropylacrylate and mixtures thereof and is present in an amount from 2 to 20 parts per 100 parts of modulus modifier and polysiloxane monomers, said polymer having a flexural modulus of at least 1,500 Kg/cm2. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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