Foam produced from polypropylene with low gel content

摘要

Process for providing a polypropylene composition comprising a branched polypropylene in which a polypropylene with a melt flow rate MFR2 (230° C.) of more than 0.5 g/10 min is reacted with a thermally decomposing free radical-forming agent and optionally with a bifunctionally unsaturated monomer obtaining thereby the branched polypropylene, wherein the polypropylene composition has a F30 melt strength of more than 20.0 cN and a V30 melt extensibility of more than 200 mm/s.

主权项

1. Process for providing a polypropylene composition that includes:
a branched polypropylene (b-PP), the process comprising: (A) reacting polypropylene (PP) with a thermally decomposing free radical-forming agent and optionally with bifunctionally unsaturated monomer(s) and/or with multifunctionally unsaturated low molecular weight polymer(s) to obtain the branched polypropylene (b-PP), wherein; the polypropylene (PP) has a melt flow rate MFR2 (230° C.) of more than 0.5 g/10 min; the polypropylene composition and/or the branched polypropylene (b-PP) has/have a F30 melt strength of more than 20.0 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, and the polypropylene (PP) is used in the form of particles having a particle size distribution d90 of below 1.500 μm, d50 of below 1.000 μm, and a d90/d50 ratio of below 1.80.