Shape memory polyurethane elastomer molded article
AssigneeMitsubishi Jukogyo Kabushiki Kaisha
InventorShunichi Hayashi
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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.
Claims2
A shape memory polyurethane elastomer molded article formed from a polyurethane elastomer which has a degree of crystallinity of 3.about.50 wt %, a glass transition point in the range of -50.degree..about.60.degree. C., a ratio of the tensile modulus at temperatures 10.degree. C. lower than the glass transition point to the tensile modulus at temperatures 10.degree. C. higher than the glass transition point of 50.about.250, and contains approximately equal amount 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.
Dependencies are inferred from the claim text.