Internally lubricated fiber, cardable hydrophobic staple fibers therefrom, and methods of making and using the same
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United States of America Patent
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Jan 23, 2001
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N/A
app pub date -
Feb 18, 1998
filing date -
Aug 6, 1996
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Abstract
Hydrophobic polyolefin fibers are provided with an internal hydrophobic polysiloxane of the formula ##STR1## in which X, Y, R.sup.1, and R.sup.2, which may be the same or different, or substituted or unsubstituted independently of each other, are aliphatic groups having not more than about sixteen carbon atoms, R.sup.1 and R.sup.2 also being selected from among aryl groups, and z being a positive number sufficiently high that the polysiloxane is hydrophobic (z is generally a least 10). The invention also provides a novel polymer melt for spinning these hydrophobic fibers. The fibers can be cut into staple lengths and carded and bonded to form hydrophobic woven and nonwoven products suitable for use in hygiene devices such as diapers. Such devices are improved by these fibers, which, as spun, present a greater hydrophobicity than melt-spun polyolefin fibers lacking the internal siloxane lubricant, the improved hydrophobicity is evidenced by an advancing contact angle for the as-spun fibers of at least about 95.degree..
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