Soft aliphatic thermoplastic polyurethane, its uses and soft molded body obtained from it.

摘要

Flexible thermoplastic polyurethane comprises: ??(A) hexamethylenedi-isocyanate; ??(B) polyoxypropylene glycol, polyoxyethylene glycol and/or poly-(oxypropylene/oxyethylene) glycol with a mol. wt. of 2500-10000; and ??(C) chain extenders with a molecular weight of 60-500. ??Flexible thermoplastic polyurethane (I) comprises: ??(A) mixture of (mol%) hexamethylenedi-isocyanate (HDI) (100-70) and other aliphatic di-isocyanates (0-30); ??(B) mixture of (b1) polyoxypropylene glycol, polyoxyethylene glycol and/or copolyoxyalkylene diols based on propylene oxide and ethylene oxide (100-70), with a number-average molecular weight (Mn) of 2500-10000 and (b2) other polyols (0-30) with an Mn of 600-10000; ??(C) chain extenders with an Mn of 60-500; ??(D) catalysts (optionally); and ??(E) additives (optionally). ??These components are reacted with a ratio of (A):(B) = (1.5:1)-(30:1) and an NCO index of 95-105. ??An Independent claim is also included for flexible molded products made from (I).