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Porous polypropylene membrane and method for production thereof

  • US 5,354,470 A
  • Filed: 01/14/1992
  • Issued: 10/11/1994
  • Est. Priority Date: 01/20/1987
  • Status: Expired due to Term
First Claim
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1. A porous polypropylene hollow fiber membrane constructed and arranged for artificial lung use having an oxygen gas flux in the range of 100 to 1,500 liters/mm.m2.atom comprising a solid phase in an inner surface region thereof formed with particles of polypropylene closely fused and joined to give rise to a continuous phase while partially exposed through the surface thereof, a solid phase in an interior and an outer surface region thereof formed with particles of polypropylene interconnected in the direction of axis of fiber to give rise to a multiplicity of lumps of polypropylene, and an interstice between said solid phases having continuous pores interconnected in the form of a three-dimensional network, wherein pores on the outer surface of said membrane consist essentially of pores having a pore diameter of 1 μ

  • m or less.

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