Lightweight nonwoven material and method of producing
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
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N/A
Issued Date -
Oct 21, 2004
app pub date -
May 10, 2004
filing date -
Apr 1, 2002
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A lightweight nonwoven material is described. The nonwoven material includes at least three layers wherein a first layer is spunlaid, a second layer is meltblown, and a third layer is spunlaid, the first and third layers being external layers. The basis weight of the nonwoven material is 15.0 gsm or less and the weight of the second meltblown layer is about 5% or less of the total basis weight. The preferred polymer for the nonwoven material is polypropylene, in particular for the meltblown fibers is a resin having a molecular weight distribution Mw/Mn in a range of about 1.8-3.2. Hydrophilicity can be imparted to the nonwoven material by inclusion of a surfactant additive in an extrusion melt during formation of fibers, or by topical treatment following formation of the layers of the nonwoven material. The method of making the nonwoven material involves formation of the layers thereof as continuous fibers and forming the layers in a continuous sequential manner, i.e., a subsequent layer being formed on top of a preceding layer or layers.
First Claim
Other Claims data not available