Use of very high fluidity isotactic polypropylenes for preparing congentrates of fillers which can be used in thermoplastics of the olefinic type and concentrates of fillers and thermoplastics thus obtained

摘要

Preparation of master batches or concentrates (A), having a high content of one or more inorganic fillers (I) and used to load thermoplastic materials with (I), using at least one polymer (II) as binder. scanning calorimetry. (II) comprises at least one isotactic polypropylene (iPP) of very high fluidity and percentage of crystallinity (index of isotacticity) over about 20, preferably 30-90 and best 50-85,%, as measured by differential. Independent claims are also included for the following: (a) (A) having (I) content over 80 (preferably 80.5-95, best 82-93,%) and index of fluidity (melt flow index, MFI) at least 5, preferably 8, g/10 min (190[deg]C; 5 kg; 2.09 mm, as measured by NF T51-620) and containing at least one iPP as specified above; (b) method for producing thermoplastic materials filled with (I) by mixing them with (A); and (c) molded, extruded or calendered objects produced using (A).