PURPOSE: The titled composite fibers, consisting of a core component consisting of polyethylene terephthalate and a sheath component consisting of polycarbonate and polyethylene terephthalate in a specific proportion, having low dyeability, and capable of giving improved multicolor effect.
CONSTITUTION: Composite fibers obtained by spinning polyethylene terephthalate, prepared by polycondensing 90mol% or more ethylene glycol with terephthalic acid, and having preferably 15,000W24,000 molecular weight as a core component and polyethylene naphthalate prepared by polycondensing bisphenol type polycarbonate having ≥10 polymerization degree of polyethylene naphthalate prepared by polycondensing 90mol% or more ethylene glycol with naphthalene-4,4'-dicarboxylic acid or a mixture thereof as a sheath component at 10W40wt% ratio of the sheath component.
IOHARA KOUICHI
YOSHIMOTO MASATO
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