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AssigneeKuraray Co., Ltd.
InventorsYoshihiro Yamana, Hiroyuki Ono
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The present invention provides a thermoplastic polyurethane composition which comprises an ethylene-vinyl alcohol copolymer and/or a polyamide, and a thermoplastic polyurethane, in which the retention of melt tension thereof, when kept in a molten state at 220° C. for 1 hour, determined by the following equation (1), is not less than 10%. Retention of melt tension (%)=[Melt tension after being kept in a molten state/Melt tension before being kept in a molten state]×100 (1) The thermoplastic polyurethane composition of the present invention is excellent in production stability of a molded article, and can provide a molded article excellent in appearance because the progress of gelation thereof is suppressed even in a molten state.
A thermoplastic polyurethane composition comprising at least one of an ethylene-vinyl alcohol copolymer or a polyamide, and a thermoplastic polyurethane, wherein the retention of melt tension of said thermoplastic polyurethane composition, when kept in a molten state at 220° C. for 1 hour, is not less than 10%.
A multi-layered structure having a layer of an ethylene-vinyl alcohol copolymer or a polyamide, and a layer of a thermoplastic polyurethane comprising a high polymer diol having a number average molecular weight of 300 to 1800 and a crystallization enthalpy (ΔH) of not more than 70 J/g, an organic polyisocyanate and a chain extender.
Dependencies are inferred from the claim text.