Polyolefin-based split-type conjugate fiber, fiber assembly and battery separator using the same and method for producing the same
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United States of America Patent
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May 31, 2016
Grant Date -
Jan 17, 2013
app pub date -
Mar 30, 2011
filing date -
Mar 30, 2010
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Abstract
A polyolefin-based split-type conjugate fiber according to the present invention is a polyolefin-based split-type conjugate fiber obtained by composite spinning including a first component containing a polypropylene-based resin and a second component containing a polyolefin-based resin, wherein the first component contains, as a primary component, a polypropylene resin having a Q value (the ratio between the weight average molecular weight Mw and the number average molecular weight Mn) of 6 or greater and a melt flow rate according to JIS K 7210 (MFR at a measurement temperature of 230° C. under a load of 2.16 kgf (21.18 N)) of 5 g/10 min or greater and less than 23 g/10 min, and the first component and the second component are adjacent to each other in a cross section of the polyolefin-based split-type conjugate fiber. Also, the polyolefin-based split-type conjugate fiber of the present invention can be obtained by melt spinning the first component and the second component by using a split type conjugate nozzle and drawing the resulting fiber.
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