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Process for hydrophilicization of hydrophobic polymers

  • US 5,849,368 A
  • Filed: 05/05/1997
  • Issued: 12/15/1998
  • Est. Priority Date: 02/01/1995
  • Status: Expired due to Term
First Claim
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1. A process for treating a material, the process comprising steps of:

  • (a) providing the material having an outer surface, the material comprising a polymer selected from the group consisting of polyethylene terephthalate, block copolymers comprising aliphatic polyethers and aromatic polyesters, block copolymers comprising aliphatic polyethers and polyamides, polyamides, polyimides, polyurethanes, polyethylenes, polypropylenes, natural rubbers, and synthetic rubbers;

    (b) exposing the material to a first plasma stream containing O2 gas and optionally NH3 gas and/or Ar gas;

    (c) exposing the material to a second plasma stream containing NH3 gas and/or an amine having the structure R1 NH2, R1 NHR2, or H2 N--R3 --NH2, wherein R1 and R2 are hydrocarbons having from 1-8 carbon atoms and R3 is a hydrocarbon having from 2-8 carbon atoms; and

    (d) after the steps (a), (b) and (c), applying a hydrophilic prepolymer containing terminal isocyanate groups to at least part of the outer surface.

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