| 摘要 |
The present invention provides a polyurethane type/polyurethane urea type resin excellent in strength and heat resistance and a method for producing the same. The polyurethane type/polyurethane urea type resin of the present invention is suitable particularly as an artificial leather or an elastic yarn. That is, the present invention provides a method for producing a polyurethane type/polyurethane urea type resin by reacting an isocyanate group-terminated polyurethane prepolymer (A) obtained by reaction of a high molecular weight active hydrogen compound and a polyisocyanate compound with a chain extender (B) in a solvent and thereafter by removing the solvent, wherein the isocyanate group-terminated polyurethane prepolymer (A) is an isocyanate group-terminated polyurethane prepolymer obtained by reacting the following polyol (1) with a polyisocyanate compound in the presence of an excess amount of an isocyanate group and further by reacting the following polyol (2) therewith in the presence of an excess amount of an isocyanate group; Polyol (1): a polyoxyalkylene polyol having a hydroxyl group value of at most 70, a total unsaturation degree of at most 0.07 and an oxypropylene group content of at least 70 wt%, Polyol (2): a polyol selected from the group consisting of polyoxytetramethylene glycol, polyester polyol, polycaprolactone polyol and polycarbonate polyol. |
