Islands-in-sea type composite fiber and process for...

Details Islands-in-sea type composite fiber and process for... Islands-in-sea type composite fiber and process for...

2011-03-22

2011-03-22

Edwards, N. (Department: 1798)

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

C428S373000, C428S374000

Reexamination Certificate

active

07910207

ABSTRACT:
The islands-in-sea type composite fiber of the present invention comprises a sea part containing an easily soluble polymer and 100 or more island parts containing a hardly soluble polymer, per fiber. In a cross-sectional profile of the composite fiber, each of the island parts has a thickness in the range of from 10 to 1,000 nm and the intervals between the island parts adjacent to each other are 500 nm or less. The islands-in-sea type composite fiber is produced by melt spinning the sea part polymer and the island part polymer mentioned above through a spinneret for an islands-in-sea type composite fiber and taking up the spun fiber at a speed of 400 to 6,000 m/min. Dissolution and removal of the sea part polymer from the composite fiber gives a group of fine fibers having a thickness of 10 to 1,000 rim and useful for clothing, industrial materials and other applications.

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European Paten Communication; Reference P04427OEP; Application No. 05728636.1-2109 PCT/JP2005006734; Date Jun. 10, 2008; 3 pages.
Japanese Office Action; 2006-511882; Dec. 9, 2008; 3 pages.

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