Plastically deformable nonwoven web
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United States of America Patent
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app pub date -
Apr 15, 2005
filing date -
Apr 16, 2004
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Abstract
A nonwoven web formed of substantially continuous spunmelt fibers is formed from a homopolymer of polypropylene having a skewed molecular weight distribution and a polydispersity of less than 3.5. The web, when subjected to high speed incremental deformation, is plastically deformed and characterized by, e.g., a tensile strength at 400% elongation which is at least 10% of the peak tensile strength, a tensile strength at 250% elongation which is at least 40% of the peak tensile strength, and a ratio of the viscoelastic deformation energy after the peak tensile strength to the viscoelastic deformation energy before the peak tensile strength which is greater than one.
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