AQUEOUS DISPERSION OF POLYURETHANE RESIN, FIRE-RESISTANT POLYESTER-BASED FIBER USING SAME, AND METHOD FOR PRODUCING SAID FIBER

摘要

This aqueous dispersion of polyurethane resin is obtained by in-water chain elongation resulting from adding (C) at least one chain elongation agent selected from the group consisting of a water-soluble polyamine, hydrazine, or a derivative of one of same to a dispersion resulting from the emulsification/dispersion in water of a mixture of at least (A) a urethane prepolymer neutralization product and/or a urethane prepolymer having an isocyanide group at the terminal thereof and (B) at least one compound selected from the phosphorus compounds represented by formula (I). In particular, it is necessary that the urethane prepolymer that is component (A) be obtained from (a1) an organic polyisocyanate and (a2) a high-molecular-weight polyol, and the urethane prepolymer neutralization product be a neutralization product resulting from neutralizing a urethane prepolymer obtained from a compound having at least two active hydrogens and an anionic hydrophilic group in the molecule of (a1), (a2), and (a3).