Porous acrylonitrile polymer fiber

摘要

This invention offers the porous fiber in which the porous form of the fiber is with an excellent durability to heat and accordingly can afford the fiber products with a shape-retaining ability. Porous acrylonitrile fiber comprising the polymers containing not less than 95% by weight of acrylonitrile in a bonded form whereby the pores in the fiber constituting the porous structure are connected each other and are communicated with the fiber surface and, in addition, having a specific decreasing rate in the average pore diameter due to an introduction of a crosslinking structure thereinto. It is possible to offer a porous acrylonitrile fiber which has a porous structure wherein the micropores in the fiber are connected each other and are communicated with the fiber surface and also exhibits an excellent retaining ability of the shape of the fiber.