| 摘要 |
Provided is an aqueous polyurethane dispersing element with which it is possible to form a film layer exhibiting practicality in terms of ethanol water resistance and moisture permeability. An isocyanate-terminated prepolymer is obtained by reacting: a polyisocyanate (A) comprising a diphenylmethane diisocyanate (a1) and an alicyclic diisocyanate (a2); a random copolymer (B) of an ethylene oxide and a tetrahydrofuran; a polycarbonate polyol (C); a polyalcohol-based chain extender (D) having a number average molecular weight of 400 or less; and a diol compound (E) having a carboxyl group. The present invention is obtained by neutralizing said isocyanate-terminated prepolymer, dispersing the neutralized product thus obtained in water, and by subjecting the dispersed neutralized product to chain extension reaction by using an amine-based chain extender (F). |
