US 12,006,426 B2
Propylene random copolymer for use in film applications
Jingbo Wang, Linz (AT); Markus Gahleitner, Linz (AT); Klaus Bernreitner, Linz (AT); Pauli Leskinen, Porvoo (FI); and Peter Niedersüss, Linz (AT)
Assigned to BOREALIS AG, Vienna (AT)
Appl. No. 17/273,700
Filed by BOREALIS AG, Vienna (AT)
PCT Filed Sep. 9, 2019, PCT No. PCT/EP2019/073987
§ 371(c)(1), (2) Date Mar. 4, 2021,
PCT Pub. No. WO2020/064313, PCT Pub. Date Apr. 2, 2020.
Claims priority of application No. 18196776 (EP), filed on Sep. 26, 2018.
Prior Publication US 2021/0332227 A1, Oct. 28, 2021
Int. Cl. C08F 210/16 (2006.01); C08J 5/18 (2006.01); C08L 23/14 (2006.01); C08L 23/30 (2006.01); C09K 3/10 (2006.01); C08F 210/06 (2006.01)
CPC C08L 23/142 (2013.01) [C08F 210/16 (2013.01); C08J 5/18 (2013.01); C09K 3/10 (2013.01); C08F 210/06 (2013.01); C08F 2500/12 (2013.01); C08F 2810/10 (2013.01); C08J 2323/14 (2013.01); C08J 2423/14 (2013.01); C08L 23/30 (2013.01); C08L 2203/162 (2013.01); C08L 2205/025 (2013.01); C09K 2003/1084 (2013.01); C09K 2200/0617 (2013.01)] 16 Claims
 
1. A polypropylene composition (P), comprising at least 90.0 wt-%, based on an overall weight of the polypropylene composition (P), of a copolymer (C) of propylene and 1-hexene, having
i) an overall 1-hexene content in a range of 2.0 to 10.0 wt-%,
ii) a melt flow rate MFR2 determined according to ISO 1133 (2.16 kg, 230° C.) in a range of 4.0 to 20.0 g/10 min, and
iii) an amount of 2,1 erythro regio-defects of at least 0.2 mol-%,
wherein the copolymer (C) has been visbroken with a visbreaking ratio (VR) in a range of 1.5 to 15.0, wherein the visbreaking ratio is determined according to equation (2)

OG Complex Work Unit Math
wherein “MFRfinal” is the melt flow rate MFR2 determined according to ISO 1133 (230° C., 2.16 kg) of the copolymer (C) after visbreaking and “MFRstart” is the melt flow rate MFR2 determined according to ISO 1133 (230° C., 2.16 kg) of the copolymer (C) before visbreaking.