초록 ▼

Provided is a polyurethane aqueous dispersion characterized in having practical utility in terms of processing suitability when a formed film is produced by salt coagulation method, and characterized in that a formed film obtained from the same has practical utility in terms of resistance against et

Provided is a polyurethane aqueous dispersion characterized in having practical utility in terms of processing suitability when a formed film is produced by salt coagulation method, and characterized in that a formed film obtained from the same has practical utility in terms of resistance against ethanol water. A polyurethane aqueous dispersion for a formed film, the formed film being obtained by using the polyurethane aqueous dispersion and a coagulant liquid in combination, is obtained by: neutralizing an isocyanate group-terminated prepolymer obtained by reaction of a polyisocyanate (A) composed of diphenylmethane diisocyanate and alicyclic diisocyanate, a random copolymer (B) of ethylene oxide and tetrahydrofuran, a polyol (C) having a number average molecular weight of 1000 to 5000, a polyhydric alcohol-based chain extender (D) having a number average molecular weight of 400 or less, and a diol compound (E) having a carboxyl group; and dispersing the obtained neutralized substance in water, and thereafter causing a chain extension reaction using an amine-based chain extender (F).

대표청구항 ▼

1. A polyurethane aqueous dispersion for a formed film, the formed film being obtained by using the polyurethane aqueous dispersion and a coagulant liquid in combination, wherein the polyurethane aqueous dispersion being obtained by: neutralizing an isocyanate group-terminated prepolymer obtained by

1. A polyurethane aqueous dispersion for a formed film, the formed film being obtained by using the polyurethane aqueous dispersion and a coagulant liquid in combination, wherein the polyurethane aqueous dispersion being obtained by: neutralizing an isocyanate group-terminated prepolymer obtained by reaction of: a polyisocyanate (A) composed of diphenylmethane diisocyanate (a1) and alicyclic diisocyanate (a2);a random copolymer (B) of ethylene oxide and tetrahydrofuran;a polyol (C) having a number average molecular weight of 1000 to 5000;a polyhydric alcohol-based chain extender (D) having a number average molecular weight of 400 or less; anda diol compound (E) having a carboxyl group, anddispersing the obtained neutralized substance in water,and thereafter causing a chain extension reaction using an amine-based chain extender (F). 2. The polyurethane aqueous dispersion according to claim 1, wherein a molar ratio between the component (a1) and the component (a2), which is (a1)/(a2), is in a range of 20/80 to 80/20. 3. The polyurethane aqueous dispersion according to claim 2, wherein the component (a2) is at least one selected from the group consisting of hydrogenated diphenylmethane diisocyanate and isophorone diisocyanate. 4. The polyurethane aqueous dispersion according to claim 1, wherein the component (B) has a number average molecular weight of 800 to 4000, and a molar ratio between units of the ethylene oxide (EO) and units of tetrahydrofuran (THF), which is EO/THF, is in a range of 80/20 to 10/90. 5. The polyurethane aqueous dispersion according to claim 4, wherein a content of EO is 2.8% by weight or more with respect to polyurethane in the polyurethane aqueous dispersion. 6. The polyurethane aqueous dispersion according to claim 5, wherein the content of EO is 2.8% by weight to 14% by weight. 7. The polyurethane aqueous dispersion according to claim 4, wherein a content of 2,4′-diphenylmethane diisocyanate (2,4′-MDI) in the component (a1) is 40% by weight or more. 8. The polyurethane aqueous dispersion according to claim 7, wherein the content of 2,4′-MDI is 70% by weight or more. 9. A formed film obtained by using the polyurethane aqueous dispersion according to claim 1 and a coagulant liquid in combination. 10. A glove obtained by using the polyurethane aqueous dispersion according to claim 1 and a coagulant liquid in combination.