公开(公告)号：US20250083409A1

公开(公告)日：2025-03-13

申请号：US18292572

申请日：2022-08-02

Applicant: Borealis AG

Inventor： Jingbo Wang ,  Markus Gahleitner ,  Klaus Bernreitner ,  Henk Van Paridon ,  Gustaf Tobieson ,  Wilhelmus Henricus Adolf Sars ,  Anita Luyten ,  Pascal Wust ,  Onur Uzun

IPC: B32B5/26 ,  B01D39/16 ,  B32B5/02 ,  B32B7/027 ,  C08F10/06 ,  D04H1/4291 ,  D04H1/4374 ,  D04H1/56 ,  D04H3/16

Abstract: A nonwoven fabric (NF) comprising a multilayer structure that comprises: i) at least one meltblown layer (M) comprising melt blown fibers (MBF) comprising a first propylene polymer (PP1) having: a) an amount of 2,1-regiodefects in the range from 0.0 to 0.1 mol-%; and b) a melting temperature Tm in the range from 155 to 170° C., ii) at least one spunbonded layer (S) comprising spunbonded fibers (SBF) comprising a second propylene polymer (PP2) having: a) an amount of 2,1-regiodefects in the range from 0.4 to 1.5 mol-%; and b) a melting temperature Tm in the range from 145 to 160° C. wherein the melting temperature of the first polypropylene polymer Tm (PP1) is at least 5.0° C. higher than that of the second first polypropylene polymer Tm (PP2).

公开(公告)号：US20250129190A1

公开(公告)日：2025-04-24

申请号：US18694582

申请日：2022-09-15

Applicant: BOREALIS AG

Inventor： Jingbo Wang ,  Markus Gahleitner ,  Klaus Bernreitner ,  Pauli Leskinen ,  Lionel Delaviere ,  Pascal Wust

IPC: C08F210/06 ,  C08F4/6592 ,  C08K5/00

Abstract: A propylene-butene random copolymer composition comprising 98 to 99.99 wt % of a propylene-butene random copolymer based on the total weight of the propylene-butene random copolymer composition, and 0.01 to 1 wt % based on the total weight of propylene-butene random copolymer composition of an alpha nucleating agent, the composition having a melt flow rate MFR2 (230° C./2.16 kg) measured according to ISO 1133 in the range of from 20.0 to below 150.0 g/10 min a butene content in the range of from 4.0 to 8.5 wt % based on the total weight of the propylene-butene random copolymer, and a relative amount of erythro regio-defects in the range of from 0.01 to 1.2 mol %, determined by quantitative 13C NMR spectroscopy, as described herein.