| abstract |
Polypropylene characterized by: i. a percentage of insertions 2.1, relative to the total number of propylene molecules in the polymer chain, of at least 0.2%; ii. a melting temperature Tm between 140 ° C and 160 ° C determined according to the ISO 3146 standard; iii. a frequency ratio for a fixed modulus of 1,000 Pa for the storage shear modulus (G ') and the shear loss modulus (G' ') greater than 4.7; iv. Carreau-Yasuda (CY) parameters η0, b and τ that fulfill the relationship ** (See formula) ** when adjusted to the Carreau-Yasuda equation, said Carreau-Yasuda parameters n0, b, and τ are determined from from a dynamic rheology analysis (RDA); v. a molecular weight distribution (MWD) of at least 2.5; and I saw. a number average molecular weight (Mn) of at most 45 kg / mol; wherein the polypropylene has less than 100 ppm of volatile organic compounds as determined according to ATD-GC-FID. |