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PRODUCTION OF STRONGLY ACIDIC CATION EXCHANGE FIBER
PRODUCTION OF STRONGLY ACIDIC CATION EXCHANGE FIBER
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机译：生产强酸阳离子交换纤维
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摘要
PURPOSE:To obtain easily and economically the title fiber which is suitable for use in air and liquid filters, has excellent strength, ion exchange rate (adsorptivity) and heat resistance and is of high quality, by treating a specified fibrous molding with gaseous sulfuric anhydride. CONSTITUTION:A fibrous molding (A) having a fineness of 0.1-500de (e.g., multi-core sea-island type), mainly composed of a major proportion of a poly (arom. monovinyl compd.) composed of a (co)polymer of (alpha-methyl)styrene, vinyltoluene, vinylnaphthalene, p-chlorostyrene, etc., a graft copolymer thereof or a blend thereof and a minor proportion of a reinforcing polymer (e.g., a polyester, a polyamide, a poly-alpha-olefin) is sulfonated and simultaneously crosslinked in an atmosphere contg. 0.1-90% gaseous sulfuric anhydride (B) to obtain the title fiber having an introduced sulfo group content of 0.1-10meq/g of dry molding and a degree of hydration of 0.1-10 which is a measure of a degree of crosslinking.
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