公开(公告)号：US11859316B2

公开(公告)日：2024-01-02

申请号：US17084859

申请日：2020-10-30

申请人： TOTALENERGIES ONETECH BELGIUM

发明人： Gaetan Henry ,  Guillaume Pavy ,  John Bieser ,  Hugues Haubruge ,  Alain Standaert

IPC分类号： C08F2/02 ,  C08F4/6592 ,  C08F210/06 ,  C08L23/14 ,  D01D1/04 ,  D01D5/098 ,  D01D5/12 ,  D01D7/00 ,  D04H3/16 ,  D01F6/30 ,  D01F6/06 ,  D01D5/08 ,  D04H1/4291 ,  D04H3/007

CPC分类号： D01F6/30 ,  D01D5/08 ,  D01D5/0985 ,  D01F6/06 ,  D04H1/4291 ,  D04H3/007 ,  C08F4/65922 ,  C08F4/65925 ,  D10B2321/022 ,  Y10T442/682 ,  C08F10/00 ,  C08F4/65927

摘要： Fibers can include a polypropylene composition, which can include a metallocene random copolymer of propylene and a comonomer that is an alpha-olefin different from propylene. The metallocene random copolymer can have a comonomer content of from 1.2 wt % to 1.8 wt %, a molecular weight distribution of at least 1.0 and of at most 4.0 obtained without thermal or chemical degradation, and a melting temperature Tmelt of at most 140° C. A nonwoven can include the fibers, and a laminate can include the nonwoven. The fibers can be produced by polymerizing the propylene and comonomer in presence of a metallocene-based polymerization catalyst to obtain the metallocene random copolymer. The polypropylene composition can be melt-extruded to obtain a molten polypropylene stream, which can be extruded from capillaries of a spinneret to obtain filaments. A diameter of the filaments can be rapidly reduced to obtain a final diameter.