Mikrozelluläres, harnstoffgruppenhaltiges Polyurethanelastomer

摘要

The invention relates to a microcellular PU elastomer with improved dynamic-mechanical characteristics, based on an isocyanate component consisting essentially of 4,4'-MDI and other standard components. The elastomer in question has a physical-chemical structure characterised by a one- or two-peak signal next to the low-molecular main signal for an (apparent) molar mass of greater than 250,000 g/mol as measured by gel-permeation chromatography from a solution of the microcellular PU elastomer produced at 90 DEG C in N,N-dimethylformamide with 1 % di-n-butylamine, against polymethylmethacrylate (PMMA) as the standard, the signal being reduced or eliminated following addition of lithium chloride to this solution. The elastomer has a urea content of 14-18 wt %. Also disclosed are a process for producing such a microcellular PU elastomer with improved dynamic-mechanical characteristics and the use of said elastomer to produce damping elements.