IT1062992B - High oxygen transmission contact lens - comprising crosslinked ionic polymer hydrogel obtd. from vinyl(idene) monomer, unsatd. acid or anhydride
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High oxygen transmission contact lens - comprising crosslinked ionic polymer hydrogel obtd. from vinyl(idene) monomer, unsatd. acid or anhydride
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IT1062992B
IT1062992BIT2184476AIT2184476AIT1062992BIT 1062992 BIT1062992 BIT 1062992BIT 2184476 AIT2184476 AIT 2184476AIT 2184476 AIT2184476 AIT 2184476AIT 1062992 BIT1062992 BIT 1062992B
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Application filed by Global Vision Uk LimitedfiledCriticalGlobal Vision Uk Limited
Priority to IT2184476ApriorityCriticalpatent/IT1062992B/en
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A contact lens with an oxygen transmission corresp. at least to an atmos. oxygen equiv. of 5% comprises a polymeric hydrogel contg. >=30 wt. %, pref. 50-85 wt. % water, based on total wt. of hydrogen, the molecular structure of the hydrogel contg. ionic gps. and the hydrogel being the hydrated polymer obtd. from a monomer mixt. contg. a large amt. of a vinyl(idene) monomer, and smaller amts. of an unsatd. anhydride or acid and a crosslinking agent. The lens is soft, hydrophilic, can be worn for long periods without causing anoxy of the underlying correa, undergoes minimum displacement during blinking, has high oxygen permeability and can be sterilised in boiling water without causing deterioration of the polymer.
HYDROPHILIC, CLEAR MATERIAL WITH HIGH OXYGEN PERMEABILITY BASED ON INTERPENETRATING POLYMER NETWORKS, METHOD FOR MAKING AND PRODUCING SOFT HIGH OXYGEN PERMEABLE CONTACT LENSES