Melt spun polyester nonwoven sheet
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United States of America Patent
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Apr 15, 2003
Grant Date -
N/A
app pub date -
Dec 20, 1999
filing date -
Dec 20, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This invention provides a process for making a nonwoven sheet of substantially continuous melt spun fibers by extruding melt spinnable polymer containing at least 30% by weight low IV poly(ethylene terephthalate), drawing the extruded fiber filaments at a rate of at least 6000 m/min, laying the fiber filaments down on a collection surface, and bonding the fiber filaments together to form a nonwoven sheet. The invention further provides a nonwoven sheet comprised of at least 30% by weight poly(ethylene terephthalate) having an intrinsic viscosity of less than 0.62 dl/g, where the sheet has a basis weight of less than 125 g/m.sup.2, and a grab tensile strength of at least 0.7 N/(g/m.sup.2).
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