Composite fiber, composite mixed-filament fiber including same, woven/knitted fabric, and garment

Abstract

A composite fiber that satisfies properties of both stretchability and wear resistance, and that exhibits a delicate worsted-wool feeling closer to wool, a deep natural appearance, and a satisfactory feeling is described, and a woven/knitted fabric and a garment including the composite fiber, where the composite fiber includes a polyester-based thermoplastic resin A and a polyester-based thermoplastic resin B, and satisfies requirements (1) to (4): (1) a difference (MA−MB) between a weight average molecular weight MA of the polyester-based thermoplastic resin A and a weight average molecular weight MB of the polyester-based thermoplastic resin B is 2,000 to 15,000; (2) in the composite fiber, an apparent thick/thin ratio (Dthick/Dthin) of the composite fiber is 1.05 to 3.00; (3) in a cross-section of the composite fiber, the polyester-based thermoplastic resin B covers the thermoplastic resin A, and a ratio (tmin/D) of a minimum value tmin of a thickness t of the thermoplastic resin B to a fiber diameter D of the composite fiber is 0.01 to 0.10; and (4) in the cross-section of the composite fiber, a circumferential length Ct of a portion where the thickness t satisfies 1.00tmin≤t≤1.05tmin is Ct≥0.33 C with respect to an entire circumferential length C of the composite fiber.

Dependencies are inferred from the claim text.