Method of making a contact lens material with increased oxygen permeability

CAFC
  • US 4,306,042 A
  • Filed: 09/08/1980
  • Issued: 12/15/1981
  • Est. Priority Date: 09/02/1980
  • Status: Expired due to Term
First Claim
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1. A method of making an oxygen permeable material for the manufacture of contact lens by the synthesization of the monomer 1,1,1-tris(methylsiloxy)methacryloxypropylsilane (a siloxanyl alkyl ester) by the following procedures:

  • (a) a mixture is prepared having the relationship of one mole of methacryloxypropyltrimethoxysilane with three to forty moles of trimethylchlorosilane;

    (b) the mixture is then added to water whose volume is from 3 to 10 times that of the mixture;

    (c) agitation is maintained for 30 minutes to 48 hours;

    (d) then allow the mixture to separate into layers, remove and filter the upper organic layer;

    (e) the unwanted by-product (hexamethyldisilane) is then removed by vacuum distillation;

    (f) forming an oxygen permeable contact lens material by copolymerizing from 5% to 90% by weight of the 1,1,1-tris(trimethylsiloxy)methacryloxypropylsilane prepared above;

    3% to 90% by weight of an ester of acrylic or methacrylic acid;

    from 0.05% to 90% by weight of a surface wetting agent, from 0.01% to 90% by weight of an oxygen permeable crosslinking agent selected from the class of multifunctional siloxanyl alkyl esters in the presence of a free radical or a photo initiator.

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