Temperature-sensitive color-changeable composite fiber.

摘要

A temperature-sensitive color-changeable composite fiber wherein (A) a thermally color-changeable polymer phase (phase A) composed essentially of a thermally color-changeable material and a thermoplastic polymer having a melting point or a softening point of 230 DEG C or lower, the content of the thermally color-changeable material being 0.5 to 90 % by weight and (B) a protective polymer phase (phase B) composed essentially of a fiber-forming thermoplastic polymer are brought into contact with each other, (i) the protective polymer phase (phase B) occupying at least 60 % of the fiber surface area, and (ii) the protective polymer phase (phase B) occupying 20 to 95 % by weight relative to the overall fiber. The composite fiber of this invention has reversibly thermally color-changeable performance of excellent temperature-sensitive color-changeability, color vividness, washing durability and light resistance.