Shape memory polyurethane elastomer molded article

Details Shape memory polyurethane elastomer molded article Shape memory polyurethane elastomer molded article

C - Chemistry, Metallurgy

08

G

402/147

C08G 18/10 (2006.01)

Patent

CA 1330680

6. 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 injec- tion molding, extrusion molding, and blow molding, and can be manufactured freely without being restricted by the shape of the molded article.

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