Patent ID: 9356272
Filing Date: 2016-05-31
CPC Classification: D01D,D01F,D04H,H01M,Y02E,Y10T

Claim Text:
1. A polyolefin-based split-type conjugate fiber obtained by composite spinning comprising: a first component comprising a polypropylene-based resin; and a second component comprising a polyolefin-based resin, wherein the first component comprises, as a primary component, a polypropylene-based resin having a Q value of 6 or greater, where the Q value is a ratio of weight average molecular weight Mw relative to number average molecular weight Mn, and a melt flow rate MFR of 8 g/10 min or greater and less than 16 g/10 min according to JIS K 7210, where the MFR is measured at a temperature of 230° C. under a load of 2.16 kgf, which is equivalent to 21.18 N, wherein the polypropylene-based resin contained as the primary component in the first component has a tensile modulus measured according to the JIS K 7161 in a range from 2000 MPa to 2700 MPa, the polypropylene-based resin as the primary component in the first component has a z average molecular weight Mz of 800,000 or greater and less than 4,000,000 and a Weight average molecular weight Mw of 800,000 or less, the polyolefin-based resin contained in the second component is a polymethyl pentene-based resin, and an amount of the polymethyl pentene-based resin in the second component is 80 mass % or greater, and in a cross section of the polyolefin-based split-type conjugate fiber, the first component and the second component are adjacent to each other.