Polyolefin masterbatch and composition suitable for injection molding

A thermoplastic polyolefin composition comprising a masterbatch composition and at least one olefin polymer different from the masterbatch composition, the masterbatch composition comprising (percent by weight):

• A) 50%-90% of a crystalline polypropylene component comprising:
• AI) from 25% to 75% of a fraction having a melt flow rate MFRI of from 0.1 to 10 g/10 min.;
• and
• AII) from 25% to 75% of a fraction having a melt flow rate value MFRII from 10 to 68 g/10 min.;
• wherein a ratio MFRII/MFRI is from 5 to 60, and the fractions AI) and AII) are independently selected from the group consisting of a propylene homopolymer, a random copolymer of propylene containing up to 3% of ethylene, and a random copolymer of propylene containing up to 6% of at least one C4-C10 α-olefin;
• and
• B) 10%-50% of a copolymer component comprising ethylene and at least one C3-C10 α-olefin, the copolymer containing from 15% to 50% of ethylene, and optionally minor amounts of a diene;
• said masterbatch composition having an MFR and a value of the intrinsic viscosity [η] of a fraction soluble in xylene at room temperature (about 25° C.) at least 3.5 dl/g.

A process for preparing a masterbatch composition comprising (percent by weight):

• A) 50%-90% of a crystalline polypropylene component comprising:
• AI) from 25% to 75% of a fraction having a melt flow rate MFRI of from 0.1 to 10 g/10 min.;
• and
• AII) from 25% to 75% of a fraction having a melt flow rate value MFRII from 10 to 68 g/10 min.;
• wherein a ratio MFRII/MFRI is from 5 to 60, and the fractions AI) and AII) are independently selected from the group consisting of a propylene homopolymer, a random copolymer of propylene containing up to 3% of ethylene, and a random copolymer of propylene containing up to 6% of at least one C4-C10 α-olefin;
• and
• B) 10%-50% of a copolymer component comprising ethylene and at least one C3-C10 α-olefin, the copolymer containing from 15% to 50% of ethylene, and optionally minor amounts of a diene;
• said masterbatch composition having an MFR and a value of the intrinsic viscosity [η] of a fraction soluble in xylene at room temperature (about 25° C.) of at least 3.5 dl/g;
• the process comprising polymerizing at least one monomer in a sequential polymerization, comprising at least three sequential steps, wherein components (A) and (B) are prepared in separate subsequent steps, operating in each step, except the first step, in the presence of the polymer formed and the catalyst used in the preceding step.

Bumpers and fascia comprising a masterbatch composition—comprising (percent by weight):

• A) 50%-90% of a crystalline polypropylene component comprising:
• AI) from 25% to 75% of a fraction having a melt flow rate MFRI of from 0.1 to 10 g/10 min.;
• and
• AII) from 25% to 75% of a fraction having a melt flow rate value MFRII from 10 to 68 g/10 min.;
• wherein a ratio MFRII/MFRI is from 5 to 60, and the fractions AI) and AII) are independently selected from the group consisting of a propylene homopolymer, a random copolymer of propylene containing up to 3% of ethylene, and a random copolymer of propylene containing up to 6% of at least one C4-C10 α-olefin;
• and
• B) 10%-50% of a copolymer component comprising ethylene and at least one C3-C10 α-olefin, the copolymer containing from 15% to 50% of ethylene, and optionally minor amounts of a diene;
• said masterbatch composition having an MFR and a value of the intrinsic viscosity [η] of a fraction soluble in xylene at room temperature (about 25° C.) of at least 3.5 dl/g.