公开(公告)号：US20230323101A1

公开(公告)日：2023-10-12

申请号：US18022775

申请日：2021-10-14

Applicant: TOTALENERGIES ONETECH BELGIUM

Inventor： Thomas COUSTHAM ,  Alain STANDAERT ,  Aurélien VANTOMME ,  Armelle SIGWALD

IPC: C08L23/14

CPC classification number: C08L23/14 ,  C08L2205/025 ,  C08L2314/06

Abstract: The invention relates to a polypropylene composition comprising: (a) a first metallocene-catalyzed polypropylene (RPP-A) which is homopolymer, or a random copolymer of propylene and of a co-monomer; and (b) a second metallocene-catalyzed polypropylene (RPP-B) which is a random copolymer of propylene and of a co-monomer; wherein said polypropylene composition has:- a total co-monomer content of at least 1.1% by weight relative to the total weight of said polypropylene composition, as determined by 13C NMR analysis, said co-monomer being an alpha-olefin different from propylene;- a melting temperature Tm of at least 130° C., measured by DSC; - a crystallization temperature Tc of at least 95.0° C., measured by DSC; - a ratio of weight average molecular weight (Mw) to number average molecular weight (Mn) [Mw/Mn] of at least 4.50;- a ratio of z-average molecular weight (Mz) to weight average molecular weight (Mw) [Mz/Mw] of at least 2.10; and- a co-monomer distribution ratio R(Mz)/R(Mn) higher than 0.995, wherein R(Mz) is the ratio at Mz of the IR signal measured at 2959 cm-1 on the signal at 2928 cm-1, and R(Mn) is the ratio at Mn of the IR signal measured at 2959 cm-1 on the signal at 2928 cm-1, as determined by IR-detected gel permeation chromatography and- a xylene soluble content (XS) of at most 3.0% by weight. The present invention also relates to a process for the preparation of said polypropylene composition. The present invention also relates to an article comprising said polypropylene composition.