公开(公告)号：US20230203261A1

公开(公告)日：2023-06-29

申请号：US17799302

申请日：2021-02-19

Applicant: Borealis AG

Inventor： Norbert Reichelt ,  Ulla Trommsdorff ,  Daniele Tammaro

IPC: C08J9/12 ,  C08J9/14 ,  C08J9/18 ,  C08J9/228 ,  B29C39/38

CPC classification number: C08J9/122 ,  B29C39/38 ,  C08J9/18 ,  C08J9/141 ,  C08J9/228 ,  B29K2023/12 ,  C08J2323/12

Abstract: Expanded polypropylene beads comprising a polypropylene composition (C) having: a) a melt flow rate (MFR2) in the range from 1.5 to 15.0 g/10 min; b) a melting temperature (Tm) in the range from 135 to 158° C.; and c) a loss tangent (tan δ) in the range of 2.00 to 4.00 wherein the polypropylene composition (C) comprises more than 90.0 wt.-%, of a long chain branched copolymer of propylene (c-PP) comprising up to 8.0 wt.-% of comonomer(s) selected from ethylene and C4 to C10 alpha olefins, a method for the preparation of said beads, in addition to a method of forming molded articles from said beads, and the molded articles obtained thereby.