Abstract: The invention relates to high purity polypropylenes and polypropylene compositions suitable for injection molding in which the polypropylene is characterized by a percentage of 2,1-insertions, relative to the total number of propylene molecules in the polymer chain, of at least 0.2%; a melting temperature Tm ranging from 140° C. to 160° C. as determined according to ISO 3146; a ratio of frequencies at fixed modulus of 1000 Pa for storage shear modulus (G?) and loss shear modulus (G?) greater than 4.7; a molecular weight distribution (MWD) of at least 2.5; a number average molecular weight (Mn) of at most 45 kg/mol and Carreau-Yasuda parameters ?0, b and ? complying with the relationship: 2.18?1.715(b)?0.015(Ln ?0)2+0.944(b)2+0.0149(Ln ?0)(Ln ?)+0.0095(Ln ?)2>1 when fitted to the CY equation, said CY parameters ?0, b and ? are determined from a dynamic rheology analysis (RDA).

Abstract: The invention relates to high purity polypropylenes and polypropylene compositions suitable for injection molding in which the polypropylene is characterized by a percentage of 2,1-insertions, relative to the total number of propylene molecules in the polymer chain, of at least 0.2%; a melting temperature Tm ranging from 140° C. to 160° C. as determined according to ISO 3146; a ratio of frequencies at fixed modulus of 1000 Pa for storage shear modulus (G?) and loss shear modulus (G?) greater than 4.7; a molecular weight distribution (MWD) of at least 2.5; a number average molecular weight (Mn) of at most 45 kg/mol and Carreau-Yasuda parameters ?0, b and ? complying with the relationship: 2.18?1.715(b)?0.015(Ln ?0)2+0.944(b)2+0.0149(Ln ?0)(Ln ?)+0.0095(Ln ?)2>1 when fitted to the CY equation, said CY parameters ?0, b and ? are determined from a dynamic rheology analysis (RDA).