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US 10,519,570 B2Granted
Fiber grade with improved spinning performance and mechanical properties
AssigneeBorealis AG
InventorsGuido Boelaers, Bert Broeders, Joachim Fiebig, Henk Van Paridon
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Abstract
The present invention is directed to a new polypropylene composition, polypropylene fibres comprising said polypropylene composition, a spunbonded fabric comprising said polypropylene fibres and/or polypropylene composition, an article comprising said polypropylene fibres and/or said spunbonded fabric as well as to a process for the preparation of such spunbonded fabric and the use of such polypropylene composition for improving the stability of a fibre spinning line.
Claims12
A polypropylene composition (PP-C) comprising:
- a) at least 80 wt. %, based on the total weight of the polypropylene composition (PP-C), of a polypropylene (L-PP) homo- or copolymer having a melt flow rate according to ISO 1133 (230° C./2.16 kg) in the range of 0.6 g/10 min to 5 g/10 min and a comonomer content of up to 5 wt. %, the comonomers are selected from ethylene and/or C4- to C10 α-olefin, and
- b) between 2 wt. % and 20 wt. %, based on the total weight of the polypropylene composition (PP-C), of a polypropylene (H-PP) homo- or copolymer having a melt flow rate according to ISO 1133 (230° C./2.16 kg) in the range of 800 g/10 min to 1,600 g/10 min and a comonomer content of up to 5 wt. %, the comonomers are selected from ethylene and/or C4- to C10 α-olefin,
- wherein the polypropylene composition (PP-C) comprising polypropylene (L-PP) and polypropylene (H-PP) has been visbroken with a visbreaking ratio [final MFR2 (230° C.)/initial MFR2 (230° C.)] of 9 to 50, wherein “final MFR2 (230° C.)” is the MFR2 (230° C.) of the polypropylene composition (PP-C) after visbreaking and “initial MFR2 (230° C.)” is the MFR2 (230° C.) of the polypropylene composition (PP-C) before visbreaking, and
- wherein the polypropylene composition (PP-C) has a final melt flow rate according to ISO 1133 (230° C./2.16 kg) in the range of 10 g/10 min to 60 g/10 min and a final polydispersity index (PI) of not more than 4.0.
1 more element
Process for the preparation of a spunbonded fabric comprising:
- spunbonding a polypropylene composition (PP-C) by using a fibre spinning line at a maximum cabin air pressure of at least 3,000 Pa, wherein the polypropylene composition (PP-C) includes:
- a) at least 80 wt. %, based on the total weight of the polypropylene composition (PP-C), of a polypropylene (L-PP) homo- or copolymer having a melt flow rate according to ISO 1133 (230° C/2.16 kg) in the range of 0.6 g/10 min to 5 g/10 min and a comonomer content of up to 5 wt. %, the comonomers are selected from ethylene and/or C4- to C10 α-olefin, and
- b) between 2 wt. % and 20 wt. %, based on the total weight of the polypropylene composition (PP-C), of a polypropylene (H-PP) homo- or copolymer having a melt flow rate according to ISO 1133 (230° C/2.16 kg) in the range of 800 g/10 min to 1,600 g/10 min and a comonomer content of up to 5 wt. %, the comonomers are selected from ethylene and/or C4- to C10 α-olefin,
- visbreaking the polypropylene composition (PP-C) comprising polypropylene (L-PP) and polypropylene (H-PP) with a visbreaking ratio [final MFR2 (230° C.)/initial MFR2 (230° C.)] of 9 to 50, wherein “final MFR2 (230° C.)” is the MFR2 (230° C.) of the polypropylene composition (PP-C) after visbreaking and “initial MFR2 (230° C.)” is the MFR2 (230° C.) of the polypropylene composition (PP-C) before visbreaking, and
- wherein the polypropylene composition (PP-C) has a final melt flow rate according to ISO 1133 (230° C/2.16 kg) in the range of 10 g/10 min to 60 g/10 min and a final polydispersity index (PI) of not more than 4.0.
2 more elements
Dependencies are inferred from the claim text.