Polypropylene homopolymers with high heat deflection temperature, high stiffness and flowability

Polypropylene composition obtained by a process comprising

• polymerizing propylene in the presence of a catalyst system including (i) a Ziegler Natta catalyst and (ii) diethylaminomethyl triethoxysilane
• or dicyclopentane dimethoxysilane (CD P PDMS) as an external donor;
• wherein the mole ratio of aluminum in the catalyst system to the external donor is in the range of 5 to 30,
• whereby,
• (i) a first intermediate polypropylene with an MFR2 of 200 g/10 min to 2000 g/10 min (ISO 1133;
• 230° C., 2.16 kg load) is formed in a first reaction zone;
• (ii) the first intermediate polypropylene is further polymerized in a second reaction zone to form a second intermediate polypropylene having an MFR2 of 80 to 800 g/10 min or higher (ISO 1133;
• 230° C., 2.16 kg load);
• (iii) the second intermediate polypropylene is further polymerized in a third reaction zone to form the third intermediate polypropylene having an MFR2 of 50 to 300 g/10 min or higher (ISO 1133;
• 230° C., 2.16 kg load);
• and optionally compounding the third intermediate polypropylene to form the polypropylene composition having an MFR2 of 50 to 300 g/10 min or higher (ISO 1133;
• 230° C., 2.16 kg load) and a tensile modulus of 2000 MPa or higher when measured according to ISO 527-2 using injection moulded test specimens T as described in EN ISO 1873-2 (dog bone shape, 4 mm thickness),
• the polypropylene composition comprising a polypropylene base resin having a molecular weight distribution broadness MW/Mn as calculated from gel permeation chromatography according to ISO 16014-4 2003, of at least 5.

Process for the production of a polypropylene composition and a tensile modulus of 2000 MPa or higher when measured according to ISO 527-2 using injection moulded test specimens T as described in EN ISO 1873-2 (dog bone shape, 4 mm thickness) in the presence of a catalyst system including a Ziegler Natta catalyst and diethylaminomethyl triethoxysilane

• as an external donor, whereby the mole ratio of aluminum in the catalyst system to the external donor is in the range of 5 to 30,
• whereby,
• (i) a first intermediate polypropylene with an MFR2 of 200 g/10 min to 2000 g/10 min (ISO 1133;
• 230° C., 2.16 kg load) is formed in a first reaction zone;
• (ii) the first intermediate polypropylene is further polymerized in a second reaction zone to form a second intermediate polypropylene having an MFR2 of 80 to 800 g/10 min or higher (ISO 1133;
• 230° C., 2.16 kg load);
• (iii) the second intermediate polypropylene is further polymerized in a third reaction zone to form the third intermediate polypropylene having an MFR2 of 50 to 300 g/10 min or higher (ISO 1133;
• 230° C., 2.16 kg load);
• and optionally compounding the third intermediate polypropylene to form the polypropylene composition having an MFR2 of 50 to 300 g/10 min or higher (ISO 1133;
• 230° C., 2.16 kg load);
• the polypropylene composition comprising a polypropylene base resin having a molecular weight distribution broadness MW/Mn as calculated from gel permeation chromatography according to ISO 16014-4 2003, of at least 5.

A composition of matter comprising a polypropylene composition and a filler,

• the polypropylene composition comprising a polypropylene base resin, the polypropylene base resin having
• a weight average molecular weight Mw of 130,000 g/ml or lower as determined by GPC according to ISO 16014-4 2003;
• lamellas of a thickness from 24.2 nm to 84.6 nm in an amount of at least 40% when measured by stepwise isothermal segregation technique (SIST);
• and
• a molecular weight distribution broadness Mw/Mn as calculated from gel permeation chromatography according to ISO 16014-4 2003, of at least 5, and
• the polypropylene composition having an MFR2 measured according to ISO 1133 (230° C., 2.16 kg load) of at least 50 g/10 min;
• and
• a tensile modulus of 2000 MPa or higher when measured according to ISO 527-2 using injection moulded test specimens T as described in EN ISO 1873-2 (dog bone shape, 4 mm thickness).