| 摘要 |
Transparent thermoplastic polyurethanes characterized by high impact resistance, high flexural modulus, high chemical resistance and a deflection temperature under load of at least 50° C. at 264 psi are produced by blending a polyurethane reaction product with from 3 to 20 parts by weight, per 100 parts by weight of total blend, of a thermoplastic polyurethane. The polyurethane reaction product is prepared from a diphenylmethane diisocyanate and at least one chain extender at an NCO/OH ratio of from 0.95:1 to 1.10:1 in the absence of any isocyanate-reactive material having a molecular weight greater than 400.
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