POLYOLEFIN-BASED SPLIT-TYPE CONJUGATE FIBRE, FIBROUS MASS AND CELL SEPARATOR USING SAME, AND PRODUCTION METHOD FOR SAME

摘要

The disclosed polyolefin-based split-type conjugate fibre is a compositely spun polyolefin-based split-type conjugate fibre which contains a first component that includes a polypropylene-based resin, and a second component that includes a polyolefin-based resin. The first component includes, as the main component thereof, a polypropylene resin wherein the Q-value (weight-average molecular weight (Mw) to number-average molecular weight (Mn) ratio) is not less than 6, and the melt flow rate (MFR; measured temperature 230°C, load 2.16kgf (21.18N)) equivalent to JIS K 7210 is at least 5g/10 minutes but less than 23g/10 minutes; and the first component and the second component are adjacent to one-another in the cross section of the polyolefin-based split-type conjugate fibre. Furthermore, the disclosed polyolefin-based split-type conjugate fibre can be obtained by using a split-type composite nozzle to melt spin the first component and the second component, and then stretching the resulting fibre.