POLYAMIDE RESIN COMPOSITION FOR FIBER AND ITS PRODUCTION

摘要

PROBLEM TO BE SOLVED: To obtain a composition which can be desirably used as a material capable of forming fibers without encountering frequent yarn break and increased filter pressure by mixing a polyamide as a base with titanium oxide particles classified so that the content of particles having a specified or smaller particle diameter may have a specified or larger value. SOLUTION: A polyamide resin as a base is mixed with titanium oxide particles classified so that the content of particles with a particle diameter of 1μm or below may be 96 wt.% or above. The method for mixing is desirably one comprising adding a water slurry containing 5-50 wt.% classified titanium oxide particles to the polymerization system during the production of the polyamide or one comprising melt-kneading a classified powdery titanium oxide and a polyamide with a twin-screw extruder. Desirably, the classification of titanium oxide particles is performed by converting titanium oxide as a raw material into a water slurry and subjecting the slurry to gravitational classification (e.g. water elutriation). The titanium oxide used is desirably anatase titanium oxide. The amount of the titanium oxide used is desirably 0.01-60 wt.% based on the polyamide.