| abstract |
A shape memory polyurethane elastomer molded article formed from a polyurethane elastomer which has a degree of crystallinity of 3∼50 wt%, contains approximately equal amounts of [NCO] groups and [OH] groups at the terminals of the polymer, and is polymerized by the prepolymer method from a difunctional diisocyanate, a difunctional polyol, and a difunctional chain extender containing active hydrogen groups, which are formulated in a molar ratio of diisocyanate : polyol : chain extender = 2.00∼1.10 : 1.00 : 1.00∼0.10, preferably 1.80∼1.20 : 1.00 : 0.80∼0.20. It is capable of melt molding such as injection molding, extrusion molding, and blow molding, and ean be manufactured freely without being restricted by the shape of the molded article. |