Sea-island composite fiber, ultrafine fiber, and composite spinneret
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United States of America Patent
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Mar 3, 2015
Grant Date -
Nov 15, 2012
app pub date -
Jan 26, 2011
filing date -
Jan 29, 2010
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Abstract
A sea-island composite fiber has an island component which is ultrafine fibers having a noncircular cross-section, the ultrafine fibers being uniform in the degree of non-circularity and in the diameter of the circumscribed circle. The sea-island composite fiber includes an easily soluble polymer as the sea component and a sparingly soluble polymer as the island component, and the island component has a circumscribed-circle diameter of 10-1,000 nm, a dispersion in circumscribed-circle diameter of 1-20%, a degree of non-circularity of 1.2-5.0, and a dispersion in the degree of non-circularity of 1-10%.
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