Color binding mechanism for contact lenses

  • US 5,272,010 A
  • Filed: 10/01/1991
  • Issued: 12/21/1993
  • Est. Priority Date: 04/14/1989
  • Status: Expired due to Term
First Claim
Patent Images

1. A method for making a colored contact lens comprising the steps of:

  • a) providing a contact lens constructed of (1) non-hydrophilic polymers having functional groups selected from at least one of --COOH, --OH, and --NH--R, wherein R is hydrogen or C1 to C8 alkyl or (2) hydrophilic polymers;

    b) coating at least a portion of a surface of the lens with a color coat comprising at least one pigment, binding amount of binding polymer having functional groups selected from at least one of --COOH, --OH, and --NH--R, wherein R is hydrogen or C1 to C8 alkyl, and an adhesive amount of adhesion promotor having at least two functional groups per molecule of the formula --CH2 --O--R1 wherein R1 is hydrogen or C1 to C16 alkyl, and said --CH2 --O--R1 groups are attached to a carbon atom that is part of an aromatic ring, or attached to a nitrogen or oxygen atom; and

    c) subjecting the coated lens to temperature, time and atmospheric conditions which cause the color coat to adhere to the lens.

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