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US 11,098,141 B2Granted
Articles with improved optical properties
AssigneeBorealis AG
InventorsJingbo Wang, Markus Gahleitner, Katja Klimke, Juliane Braun, Pauli Leskinen
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Abstract
Moulded articles comprising a polypropylene homopolymer with rather high melt flow rate, high stiffness, improved optical properties and an advantageous balance between stiffness and optical properties.
Claims8
Moulded article comprising a polypropylene homopolymer, wherein the polypropylene homopolymer is polymerised in the presence of a Ziegler-Natta catalyst and wherein the polypropylene homopolymer:
- a) comprises 0.40-0.90 wt % of ethylene and/or a C4-C10 α-olefin determined according to 13C-NMR,
- b) comprises at least one α-nucleating agent,
- c) is free of phthalic acid esters as well as their respective decomposition products,
- d) has a MFR230/2.16 determined according to ISO1133 in the range of 20-200 g/10 min, and
- e) has a haze of ≤42% (ASTM 1003-D) when measured on 1 mm plaques,
- wherein the Ziegler-Natta catalyst is self-supported by being free of any external support material and comprises:
- a) compounds of a transition metal of Group 4 to 6 of IUPAC,
- b) a Group 2 metal compound,
- c) an internal donor, wherein said internal donor is a citraconate,
- d) a co-catalyst, and
- e) optionally, an external donor.
8 more elements
Dependencies are inferred from the claim text.