POLYESTER FIBER PRODUCT AND ITS PRODUCTION

摘要

PROBLEM TO BE SOLVED: To obtain a polyester fiber product which is dyeable with an acidic dye, facilitates dyeing with it dispersion dye and shows excellent color development and brightness by applying a poly(vinylamine) polymer to a polyester fiber product containing sulfonic acid group as an acid component. SOLUTION: A polyester fiber product prepared from a polyester comprising the acid components containing an isophthalic acid substituted with sulfonic acid (or its metallic salt) (its molar copolymerization percentage is preferably 0.1-20% based on terephthalic acid) and the glycol component containing ethylene glycol, butylene glycol and/or polyalkylene glycol is treated with a poly(vinylamine) polymer at least having a recurring unit of the formula. In an preferred embodiment, the fiber product from a polyester bearing sulfonic acid or its salt groups is treated with a polymer having a poly(vinylamine) chain and dyed with an acid dye.