One-step production of a polypropylene composition

Process for providing a polypropylene composition comprising a branched polypropylene (b-PP), the process comprising the steps of:

• a) providing a polypropylene (PP) having a melt flow rate MFR2 (230° C.) of more than 1.0 g/10 min;
• b) providing a thermally decomposing free radical-forming agent,
• c) providing bifunctionally unsaturated monomer(s) and/or multifunctionally unsaturated low molecular weight polymer(s),
• d) providing a linear polypropylene (l-PP) having a melt flow rate MFR2 (230° C.) of 10.0 to 50.0 g/10 min,
• e) reacting the polypropylene (PP) of step a) with the thermally decomposing free radical-forming agent of step b) and the bifunctionally unsaturated monomer(s) and/or multifunctionally unsaturated low molecular weight polymer(s) of step c) obtaining thereby the branched polypropylene (b-PP), and
• f) reacting the branched polypropylene (b-PP) obtained in step e) with the linear polypropylene (l-PP) of step d),
• wherein the polypropylene composition and/or branched polypropylene (b-PP) has/have
• i) a melt flow rate MFR2 (230° C.) measured according to ISO 1133 of 18.0 to 35.0 g/10 min,
• ii) a F30 melt strength of more than 3.4 cN and a v30 melt extensibility of more than 200 mm/s, wherein the F30 melt strength and the v30 melt extensibility are measured according to ISO 16790:2005.