Thermoplastic polyurethane elastomer blend and process for its manufacture

摘要

The subject invention is directed to a thermoplastic polymer blend of polyurethane and nitrile rubber having a Shore A hardness of about 55 to 70. The thermoplastic polyurethane component includes at least about 50 weight percent (wt. %) polyisocyanate; the nitrile rubber component includes about 34 mole percent (mol %) acrylonitrile; and, the ratio between the thermoplastic polyurethane component and the nitrile rubber component is about 30:70 to 40:60 volume percentage (vol %). The invention also provides a process for making a thermoplastic polyurethane blend having a Shore A hardness of about 55 to 70; prepared by mixing and kneading about about 180 DEG to 215 DEG C., polyurethane component including at least about 50 percent by weight polyisocyanate with a nitrile rubber having a viscosity of ML 1+4,100 DEG C.=50 and including about 34 mole percent (mol %) acrylonitrile in a ratio of polyurethane: nitrile rubber of about 30:70 to 40:60 percent by volume (% vol).