MULTILAYER FILTER MEDIUM FOR USE IN FILTER, AND FILTER
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United States of America Patent
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Issued Date -
Aug 8, 2013
app pub date -
Oct 27, 2011
filing date -
Oct 28, 2010
priority date (Note) -
Abandoned
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Abstract
A multilayer filter medium, which is used as a constituent member of a filter and has a multilayer structure, includes a wet type nonwoven fabric layer A containing 0.5 to 20% by weight, based on layer weight, of short-cut nanofibers which are composed of a fiber-forming thermoplastic polymer, have a single fiber diameter (D) of 100 to 1,000 nm and are cut so that the ratio (L/D) of the length (L) to the single fiber diameter (D) is within the range of 100 to 2,500 and core-sheath conjugate type binder fibers having a single fiber diameter of 5 μm or more, and a nonwoven fabric layer B having a lower density than that of the wet type nonwoven fabric layer A. A filter uses the multilayer filter medium and has the nonwoven fabric layer B arranged on a fluid inlet side.
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