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Polymerized hydrogel comprising low amounts of residual monomers and by-products

  • US 20040068093A1
  • Filed: 06/25/2003
  • Published: 04/08/2004
  • Est. Priority Date: 07/01/2002
  • Status: Abandoned Application
First Claim
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1. A process for making a hydrogel comprising from about 10 to 90 wt % water, from about 10 to 60 wt % of cross-linked hydrophilic polymer made from at least one starting monomer type, and from about 10 to 80 wt % of at least one polyol, said process comprising the steps of:

  • 1) polymerizing said starting monomer(s) from within a reaction medium comprising from about 10 to 90 wt % of water, from about 10 to 60 wt % of said starting monomer(s) and from about 10 to 80 wt % of said polyol(s), to thereby form a hydrogel;



    and thereafter 2) chemically treating said hydrogel with a compound which reacts with residual starting monomer(s), impurity(s) and/or any by-products produced by said polymerization reaction, to thereby reduce the concentration of said residual starting monomer(s), impurity(s) and/or by-products within said hydrogel.

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