Polyblend of thermoplastic polyurethane elastomer and process for its preparation

摘要

It is described as polyblend of polyurethane and nitrile rubber, a thermoplastic polyurethane elastomer without containing a plasticizer, has a hardness of 55 to 70 Shore A. The polyurethane component contains a polyisocyanate content of at least 50 wt .-%; the acrylonitrile content in the rubber component is 34 mol% and the ratio of polyurethane to the; Nitrile component amounts to 30:70 to 40:60 vol .-%. Further, a manufacturing method is provided, wherein said polyurethane having a hardness of 80 to 90 Shore A and a minimum polyisocyanate content of 50 wt .-% of a nitrile rubber having a viscosity _ML 1 + 4,100 ° C = 50 and having an acrylonitrile content is processed rubber of 30:70 to 40:60 by mixing and kneading at 180 to 215 ° C to a polyblend: from 34 mol% in volume percentage ratio of polyurethane.