| abstract |
[PROBLEMS] To provide a method for producing a powdered thermoplastic polyurethane urea resin having excellent mechanical properties, abrasion resistance, crease resistance, and the like, capable of easily controlling the molecular weight, and having excellent melt moldability. To provide. A part of the isocyanate group of an isocyanate group-terminated prepolymer is reacted with the active hydrogen group of a monofunctional active hydrogen group-containing compound having an active hydrogen group and a hydrocarbon group having 4 to 12 carbon atoms. And the step of dispersing the isocyanate group-terminated prepolymer in a dispersion medium (water) and reacting the remaining isocyanate group of the isocyanate group-terminated prepolymer with the active hydrogen group of water, When the number of moles of active hydrogen groups possessed by the monofunctional active hydrogen group-containing compound reacting with a part of x1 is x1, and the number of moles of active hydrogen groups possessing water reacting with the remainder of the isocyanate group is x2, the ratio ( x1 / x2) is 5 to 35/95 to 65. [Selection figure] None |