| 摘要 |
The present invention relates to a foam comprising a polypropylene, wherein said polypropylene is produced in the presence of a metallocene catalyst, and the foam and/or the polypropylene has (have) a) a branching index g' of less than 1.00 and b) a strain hardening index (SHI@1s-1) of at least 0.30 measured by a deformation rate dI/dt of 1.00 s-1 at a temperature of 180 °C, wherein the strain hardening index (SHI) is defined as the slope of the logarithm to the basis 10 of the tensile stress growth function (Ig (Q +)) as function of the logarithm to the basis 10 of the Hencky strain (Ig (I)) in the range of Hencky strains between 1 and 3.
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