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Polymeric materials for making contact lenses

  • US 6,815,074 B2
  • Filed: 05/22/2002
  • Issued: 11/09/2004
  • Est. Priority Date: 05/30/2001
  • Status: Expired due to Term
First Claim
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1. An ophthalmic lens, comprising a core polymeric material and an ophthalmically compatible surface which is more hydrophilic than said core polymeric material, wherein the ophthalmic lens has a high oxygen permeability characterized by a Dk greater than 56 barrers and a high ion permeability characterized by an ionoflux diffusion coefficient of great than 4.0×

  • 10

    4
    mm 2/min and comprises a water content of at least 25 weight percent when fully hydrated, wherein said ophthalmically compatible surface is an LbL coating comprisisg a plurality of bilayers and a capping layer of polyvinylpyrrolidone, wherein each bilayer comprises one layer of a first polyionic material and one layer of a second polyionic material having charges opposite of the charges of the first polyionic materials, wherein said core polymeric material is prepared by curing in a mold in an oxygen-containing or oxygen-free atmosphere a polymer composition including;

    (i) about 5 to about 40 weight percent of a macromer, wherein said macromer is selected from the group consisting of Macromer A, Macromer B, Macromer C, and Macromer D;

    (ii) about 10 to about 30 weight percent of a siloxane-containing monomer; and

    (iii) about 30 to about 50 weight percent of a hydrophilic monomer, wherein said weight percentages are based upon the dry weight of the polymer components, wherein Macromer A is a polysiloxane macromer having a number-average molecular weight of 2000 to 10,000 and the the segment of the formula;

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