Long-chain branched polypropylene for film application
AssigneeBorealis AG
InventorsHermann Braun, Jingbo Wang, Markus Gahleitner, Hermann Prokschi, Johanna Lilja
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Abstract
The invention relates to a propylene homopolymer or copolymer having a comonomer in the copolymer selected from ethylene, C4-C20-alpha olefin, said propylene homopolymer or copolymer being free of phthalic compound. It further relates to a long-chain branched propylene homopolymer or copolymer (b-PP) having a comonomer in the copolymer selected from ethylene, C4-C20-alpha olefins, said long-chain branched propylene homopolymer or copolymer (b-PP) being free of phthalic compound. As well as their production processes and uses.
Claims12
Propylene homopolymer or copolymer having a comonomer in the copolymer selected from ethylene C4-C20-alpha olefin, and any combination thereof, with a comonomer content in the copolymer in the range of 0.1 to 7.0 wt %, a xylene cold soluble (XCS) content in the range of 0.8 to 15.0 wt %, an MFR2 in the range of 1.50 to 10.0 g/10 min, where MFR2 is the melt flow rate measured according to ISO 1133 at 230° C. and a load of 2.16 kg, said propylene homopolymer or copolymer wherein:
- a) the porosity is higher than 8.0%,
- b) the median particle size d50 is in the range of 150 to 1500 μm,
- c) the top-cut particle size d95 is in the range of 500 to 4000 μm,
- d) said propylene homopolymer or copolymer is free of phthalic compound.
Propylene homopolymer or copolymer having a comonomer in the copolymer selected from ethylene, C4-C20-alpha olefin and any combination thereof, with a comonomer content in the range of 0.1 to 7.0 wt %, such propylene homopolymer or copolymer being produced in a polymerization process in the presence of a catalyst system comprising:
- a) a Ziegler-Natta based catalyst with a transition metal of Group 4 to 6 (TM), the catalyst containing an internal donor,
- b) optionally a co-catalyst (Co),
- c) optionally an external donor (ED) and wherein if present, the co-catalyst (Co) to external donor (ED) molar ratio [Co/ED] is in the range of 3.0 to 45.0 mol/mol and wherein the co-catalyst (Co) to transition metal of Group 4 to 6 (TM) molar ratio [Co/TM] is in the range of 40.0 to 500 mol/mol;
- wherein the resulting propylene homopolymer or copolymer has:
- a porosity of more than 8.0%,
- a) a median particle size d50 in the range of 150 to 1500 μm,
- b) a top-cut particle size d95 in the range of 500 to 4000 μm and
- wherein the internal donor comprised in the Ziegler-Natta catalyst (a) is a non-phthalic compound.
Long-chain branched propylene homopolymer or copolymer (b-PP) having a comonomer in the copolymer selected from ethylene, C4-C20-alpha olefin and any combination thereof and a comonomer content in the range of 0.1 to 7.0 wt %, wherein:
- a) the melt flow rate MFR2 (230° C.) of the b-PP is in the range of 6.5 to 25.0 g/10 min as measured according to ISO 1133,
- b) the F30 melt strength of the b-PP is in the range of 5.0 to 12.0 cN wherein the F30 melt strength of the b-PP is measured according to ISO 16790:2005,
- c) the xylene hot insoluble (XHU) fraction of the b-PP is less than 0.15 wt % as measured according to EN 579, and
- d) the b-PP is free of phthalic compound.
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Dependencies are inferred from the claim text.