| 摘要 |
The present invention relates to a high shrinkage side-by-side type composite filament, wherein two kinds of thermoplastic polymers are arranged side by side type and a boiling water shrinkage (Sr<SUB>2</SUB>) measured by the method (initial load=notified denierx1/10 g, static load=notified denierx20/10 g) of clause 5.10 of JIS L 1090 is 20 to 75% of a boiling water shrinkage (Sr<SUB>1</SUB>) measured by the method (initial load=notified denierx1/30 g, static load=notified denierx40/30 g) of clause 7.15 of JIS L 1013. The side-by-side type composite filament is made of two kinds of thermoplastic polymers having a number average molecular weight difference (ïMn) of 5,000 to 15,000 upon spinning and the composite filament is drawn and heat-treated so as to satisfy the following physical properties: Temperature area exhibiting 95% of maximum thermal stress (Tmax, 95%): 120 to 230° C. Range of maximum thermal stress per denier: 0.1 to 0.4 g/denier
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