Production of wetlaid-spunbond laminate membrane support
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United States of America Patent
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Dec 30, 2008
Grant Date -
Jul 13, 2006
app pub date -
Mar 7, 2006
filing date -
Jul 7, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Nonwoven fabric laminates suitable for use as semipermeable membrane supports are produced by forming a spunbond nonwoven fabric first layer of continuous thermoplastic polymer filaments; forming a wet-laid nonwoven fabric second layer of discrete length thermoplastic polymer fibers; and bonding the first and second layers in opposing face-to-face relationship to form a composite support, where the first and second layers define first and second outer surfaces of the composite support. The resulting semipermeable membrane supports provide an advantageous balance of properties, including smoothness, porosity, interlaminar adhesion, and flux properties.
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