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    • 34. 发明专利
    • THERMOPLASTIC RESIN COMPOSITION
    • JPH04342762A
    • 1992-11-30
    • JP11619291
    • 1991-05-21
    • MITSUBISHI HEAVY IND LTD
    • TASAKA YOSHIYUKITAMURA YUKIOHAYASHI SHUNICHI
    • C08L75/04C08L75/00
    • PURPOSE:To obtain a shape-memory thermoplastic resin composition having improved coloring flexibility and handleability without deteriorating the shape- memory property and mechanical properties of a thermoplastic polyurethane by mixing a thermoplastic polyurethane with other general-purpose resin. CONSTITUTION:The objective shape-memory thermoplastic resin composition having a ratio of E-20/E+20 of preferably 10-350 [E+20 is storage modulus at Tg+20 deg.C (Tg is main glass transition temperature); E-20 is storage modulus at Tg-20 deg.C] is produced by compounding (A) 100 pts.wt. of a thermoplastic polyurethane having a glass transition point of 0-80 deg.C and produced by adding a bifunctional chain extender (e.g. ethylene glycol) to a prepolymer obtained by the reaction of a bifunctional isocyanate with a bifunctional polyol in the absence of catalyst and (B) 0.1-20 pts.wt. of a polyethylene and 0.05-10 pts.wt. of an ethylenic copolymer (e.g. ethylene/ethyl acrylate/maleic anhydride copolymer) or (C) 0.1-20 pts.wt. of a polystyrene and 0.05-10 pts.wt. of a styrenic copolymer (e.g. styrene/methacrylic acid copolymer).