PURPOSE: To obtain an ion exchange fiber and a gas absorbing material by irradiating an ionizing radiation to a fiber having a specific core-sheath structure and grafting the fiber with a polymerizable monomer.
CONSTITUTION: An olefinic polymer such as a polyethylene capable of producing a radical by irradiating ionizing radioaction rays such as γ-rays or electron beam is arranged in the sheath part of a fiber and a polyethylene terephthalate hardly causing degradation due to irradiation is arranged in the core part to afford a core-sheath type fiber concentrically or eccentrically formed in a shear-core weight ratio of 0.1-10 and the ionizing radioactive rays are irradiated to the core-sheath type fiber or fabric or nonwoven fabric made therefrom in which sheath parts of adjacent fibers are fused or its processed product, and then, the fiber is grafted with a polymerizable monomer such as glycidyl methacrylate to form the objective separation functional fiber. The core-sheath structure fiber or the separation functional fiber is subjected to radiation graft polymerization with a monomer other than styrene to provide the objective ion exchange fiber, and the objective gas adsorbing material is obtained by using the separation functional fiber.
YAMADA TOSHIHIKO
SHIMA HIROYUKI
FUJIWARA KUNIO
EBARA CORP
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