| 摘要 |
1) Polypropylene compositions hereinafter compositions, particularly suitable for the preparation of foamed materials, comprise, by weight: a) 3-75% of cross-linked PP b) 97-25% of not cross-linked PP, having (~) comprised between 0.50 and 1.3 dl/g, and are characterized by: - M.I. (230.degree.C, 2.16kg) comprised between 0.001 and 600 kg/10' - cross-linked PP as dispersion in the not cross-linked PP, and in form of roughly spheroidal gels of 0.5-100 microns. 2) Process for the preparation of the above mentioned compositions, comprising causing a mixture of PP with peroxidic cross-linking, a furane derivative co-agent and optionally a foaming agent, to undergo a dynamic vulcanization.
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