| 摘要 |
PURPOSE: A method of making polyester fiber dyeable with a disperse dye and a basic dye even under ordinary pressure by a high-speed spinning method is provided. CONSTITUTION: Molten substances of polyester copolymers are spun at a rate of 6,000m/m or higher through a spinneret, heated with a heating hood having a length of 50 to 100mm placed directly under the spinneret and then subjected to a cooling, oiling-agent providing, air texturing and taking-up process to produce polyester fiber having dyeability properties. The molten substances of polyester copolymers contain 1.0 to 1.5% by mole of an isophthalic acid compound of the formula(I), based on the acidic component of the polyester. In formula, R is an alkyl group, M is an alkali metal. The polyester fiber has an amorphous orientation degree(Δna) of 0.3 to 0.9, a boiling water shrinkage value(100deg.Cx30min) of 12 to 20% and a strength of 4.0g/d or higher.
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