| 摘要 |
PROBLEM TO BE SOLVED: To obtain the subject flame-retardant yarn having high strength, no melt drip, excellent durability of washing resistance, useful as protection clothing, etc., by spinning a spinning dope comprising a vinyl alcohol-based polymer, a halogen-containing polymer, etc., under specific conditions. SOLUTION: A spinning dope having a phase structure in which islands of a particle base having 2-10μm particle diameters composed of a halogen- containing vinyl polymer 2 such as a vinyl chloride-based polymer, etc., exists in a solution of a vinyl alcohol-based polymer 1 is subjected to a wet or a dry and wet spinning in a solidifying bath obtained by mixing a solidifying solvent having solidifying ability of the component 1 with a dope solvent, drawn in a wet state at 1.5-3.0 times wet draw ratio, extracted, dried and further drawn in dry heat to give the objective polyvinyl alcohol-based flame-retardant yarn. Preferably, the spinning dope is mixed with 0.1-10 wt.% based on the total weight of the polymers of one or more compounds selected from the group consisting of a tin compound such as tin oxide and an antimony compound such as antimony pentoxide.
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