Liquid purification or separation – Filter – Material
Reexamination Certificate
2005-12-15
2008-10-28
Menon, Krishnan S (Department: 1797)
Liquid purification or separation
Filter
Material
C210S500100, C210S500210, C096S004000, C427S245000
Reexamination Certificate
active
07441667
ABSTRACT:
An improved casting substrate is provided for use in a composite membrane for use as a fluid filtration medium. The composite membrane has good adhesion between the casting substrate and the microporous membrane while maintaining high permeability. The casting substrate comprises a single spunbond layer or a multiple spunbond layers formed of thermoplastic fibers, optionally comprising at least one meltblown layer. The casting substrate allows the membrane casting solution to penetrate the casting substrate uniformly to a controlled depth without penetrating through the entire thickness of the substrate. The casting substrate has good uniformity of mean pore size, basis weight, thickness and surface roughness.
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Richard Baker, “Solution Coated Composite Membrane”, Membrane Technology & Applications, 2nd Edition, 2004, pp. 119-122.
Galvin Jennifer Marie
Gommeren Henricus Jacobus Cornelis
Montejo Rachel Elizabeth
Waller Tina Amick
E.I. du Pont de Nemours and Company
Menon Krishnan S
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