Shape memory polyurethane elastomer molded article

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

1989-09-28

1992-09-08

Welsh, Maurice J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having at least one -n=c=x group as well as...

528 66, C08G 1810

Patent

active

051459353

ABSTRACT:
A shape memory polyurethane elastomer molded article formed from a polyurethane elastomer which has a degree of crystallinity of 3.about.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.about.1.10: 1.00: 1.00.about.0.10, preferably 1.80.about.1.20: 1.00: 0.80.about.0.20. It is capable of melt molding such as injection molding, extrusion molding, and blow molding, and can be manufactured freely without being restricted by the shape of the molded article.

REFERENCES:
patent: 5049591 (1991-09-01), Hayashi et al.
"Development of Polymeric Elasticity Memory Material", Mitsubishi Juko GIHO vol. 25, No. 3 (1988) pp. 236-240).

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