Radiation grafting of acrylic acid was carried out on polyvinyl chloride)fiber to improve the softening temperature without serious damage to its flame-retardance. Grafting of acrylic acid proceeded smoothly when ethylene dichloride and water were mixed with the monomer. A small amount of Mohr's salt was added to the mixture to suppress the formation of acrylic acid homopolymer outside of the fiber. Grafting was performed either by the immersion method using T-rays from aCobalt-60 sources or by

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... the impregnation method using electron beams from a Van de Graaffaccelerator. In the case of the impregnation grafting,3G%grafting was easily obtained by irradiating 2 seconds at adose rate of O.1Mrad/sec. Grafted fibers showed higher heat-shrinkage temperatures especially when acrylic acid was converted to the calcium salt+Damage to the flame-retardance was no1 seriou, as fibers of 100%graft kept the self-extinguishing property of the original specimen. The hydrophilic property was also improved, and the sodium salt of i 5-20%graf showed the same level of moisture regain as cotton.