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Cationically charged coating on hydrophobic polymer fibers with poly (vinyl alcohol) assist

  • US 6,537,614 B1
  • Filed: 12/18/1998
  • Issued: 03/25/2003
  • Est. Priority Date: 12/18/1998
  • Status: Expired due to Term
First Claim
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1. A method of preparing a fibrous filter, the method comprising:

  • providing a fibrous filter comprised of hydrophobic polymer fibers;

    treating the fibrous filter with an aqueous solution of a functionalized cationic polymer crosslinkable by heat under conditions sufficient to substantially coat the fibers with the functionalized cationic polymer, wherein the solution comprises the functionalized cationic polymer, a poly(vinyl alcohol), a polar solvent for the poly(vinyl alcohol), and water; and

    treating the resulting coated fibrous filter with heat at a temperature and for a time sufficient to crosslink the functionalized cationic polymer present on the hydrophobic polymer fibers.

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