Polyvinylidene fluoride filaments

摘要

An improved polyvinylidene fluoride resin-made filament. It consists substantially of a blend of 99-wt. % of a first polyvinylidene fluoride resin component having an inherent viscosity higher than 1.30 dl/g on the one hand, and 1-60 wt. % of a second polyvinylidene fluoride component having an inherent viscosity lower than 1.20 dl/g on the other. The blend has a critical shearing stress lower than 2.8x10 dyne/cm2 and is subjected to melt-spinning and successively to a primary and a secondary stretching in a temperature region of 70 DEG -180 DEG C. The overall stretch factor is selected to be 4-10.