×

Methods of making shaped polymeric materials

  • US 8,696,975 B2
  • Filed: 12/08/2008
  • Issued: 04/15/2014
  • Est. Priority Date: 12/12/2007
  • Status: Active Grant
First Claim
Patent Images

1. A method of making a shaped polymeric material comprising:

  • providing a precursor composition comprising(a) at least 10 weight percent polar solvent based on the total weight of the precursor composition; and

    (b) no greater than 90 weight percent polymerizable material based on the total weight of the precursor composition, the polymerizable material being capable of free-radical polymerization and having an average number of ethylenically unsaturated groups per monomer molecule equal to at least 1.2, wherein the polymerizable material forms a single phase with the polar solvent and comprises a poly(alkylene oxide(meth)acrylate) having at least 2 (meth)acryloyl groups and having at least 5 alkylene oxide units, the poly(alkylene oxide(meth)acrylate) having a weight average molecular weight less than 2,000 g/mole;

    providing a mold having at least two separate wells;

    adding the precursor composition to the mold, the precursor composition being positioned in the at least two separate wells;

    exposing the precursor composition positioned in the at least two separate wells to radiation to at least partially polymerize the polymerizable material and to form a first swollen shaped polymeric material; and

    further comprising removing at least a portion of the polar solvent from the first swollen shaped polymeric material to form a dried shaped polymeric material, and contacting the dried shaped polymeric material with a sorbate for a time sufficient for the dried shaped polymeric material to sorb at least a portion of the sorbate to form a second swollen shaped polymeric material, wherein the sorbate comprises at least one active agent.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×