초록

Novel water-swellable fibers having a multiple layer structure consisting of an hydrogel outer layer and an inner layer of an acrylonitrile polymer and/or another polymer, which combine a high degree of water-swellability with excellent physical properties, and a process for producing the same.

대표청구항 ▼

Water-swellable fibers with a high degree of swellability composed of an outer layer of a hydrophilic crosslinked polymer and an inner layer of an acrylonitrile polymer, such fiber being produced by contacting acrylonitrile fibers with an aqueous solution of an alkali-metal hydroxide of a high conce

Water-swellable fibers with a high degree of swellability composed of an outer layer of a hydrophilic crosslinked polymer and an inner layer of an acrylonitrile polymer, such fiber being produced by contacting acrylonitrile fibers with an aqueous solution of an alkali-metal hydroxide of a high concentration not less than 6.0 mol/1000 g, or an aqueous solution of an alkali-metal hydroxide of a low concentration coexisting with an electrolytic salt of a concentration not less than 0.5 mol/1000 g for a sufficient time to cross-link and render the outer layer of the fibers hydrophilic, thereby producing fibers having said hydrophilic cross-linked outer layer and a non-cross-linked, non-hydrophilic acrylonitrile inner layer.