Composite fiber, method for producing polyurethane elastomer fabric, and polyurethane elastomer fabric

Abstract

Provided is a composite fiber capable of forming a fabric giving a good wearing feeling to a human body. This composite fiber is composed of a polyurethane elastomer having a glass transition temperature of 15 to 50° C. as a component A, and a readily soluble thermoplastic polymer as a component B. In a cross section of the fiber, the component A constitutes a core, and the component B covers 70% or longer of the circumference of the component A. The component B may be, for example, a readily soluble polyester or thermoplastic polyvinyl alcohol-based polymer. The composite ratio (mass ratio) of the component A to the component B may be 90:10 to 40:60.

Dependencies are inferred from the claim text.