# US 10,767,036 B2 · Polyolefin composition for fibers > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,767,036 B2 - Document ID: US10767036B2 - Status: Granted - Kind: B2 - Application number: 16/629,104 - Filed: 2018-06-20 - Published: 2020-05-28 - Granted: 2020-09-08 - Earliest claimed: 2017-07-07 - Assignees: Basell Poliolefine Italia S.r.l. - Applicants: Basell Poliolefine Italia S.R.L. - Inventors: Monica Galvan; Claudio Cavalieri; Jaume Marti Porqueres; Renaud Lemaire; Roberto De Palo - Web page: https://patentgrep.com/patent/US10767036B2 ## CPC - C08L 23/12: Polypropene - C08L 23/0815: {with aliphatic 1-olefins containing one carbon-to-carbon double bond} - C08L 23/14: Copolymers of propene (C08L23/16 takes precedence) - C08L 2203/12: used for fibers - C08L 2205/035: containing four or more polymers in a blend - C08L 2207/064: VLDPE - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) ## Abstract A polyolefinic fiber made from or containing from 2 wt % to 20 wt % relative to the total weight of the fiber of a polyolefin composition made from or containing: A) 5-35% by weight of a propylene homopolymer or a propylene ethylene copolymer; B) 20-50% by weight of a copolymer of ethylene and a C3-C8 alpha-olefin containing from 0.1% to 20% by weight of alpha-olefin units and containing 25% by weight or less of a fraction soluble in xylene at 25° C.; and C) 30-60% by weight of a copolymer of ethylene and propylene containing from 25% to 75% by weight of ethylene units and containing from 40% to 95% by weight of a fraction soluble in xylene at 25° C.; the amounts of (A), (B) and (C) being referred to the total weight of (A)+(B)+(C), the sum of the amount of (A)+(B)+(C) being 100. ## Claims ### Claim 1 A polyolefinic fiber comprising: from 2 wt % to 20 wt % relative to the total weight of the fiber of a polyolefin composition comprising: A) 5-35% by weight of a propylene homopolymer or a propylene ethylene copolymer containing 90% by weight or more of propylene units; component A) containing 10% by weight or less of a fraction soluble in xylene at 25° C. (XSA), both the amount of propylene units and of the fraction XSA being referred to the weight of A); B) 20-50% by weight; of a copolymer of ethylene and a C3-C8 alpha-olefin containing from 0.1% to 20% by weight of alpha-olefin units and containing 25% by weight or less; of a fraction soluble in xylene at 25° C. (XSB), both the amount of alpha-olefin units and of the fraction XSB being referred to the weight of (B); and C) 30-60% by weight of a copolymer of ethylene and propylene containing from 25% to 75% by weight of ethylene units and containing from 40% to 95% by weight of a fraction soluble in xylene at 25° C. (XSC), both the amount of ethylene units and of the fraction XSC being referred to the weight of (C); the amounts of (A), (B) and (C) being referred to the total weight of (A)+(B)+(C), the sum of the amount of (A)+(B)+(C) being 100. ### Claim 2 (depends on 1) The polyolefinic fiber according to claim 1 comprising from 3 wt % to 15 wt % of the polyolefin composition. ### Claim 3 (depends on 1) The polyolefinic fiber according to claim 1 further comprising from 98 wt % to 80 wt %; of a propylene homopolymer or copolymer D) having a fraction soluble in xylene at 25° C. lower than 10 wt %, wherein the sum of the polyolefin composition and the propylene homopolymer or copolymer being 100 wt %. ### Claim 4 (depends on 3) The polyolefinic fiber according to claim 3, wherein component D) is a propylene homopolymer or a propylene copolymer containing from 0.5 wt % to 10 wt %, of ethylene or C4-C8 alpha-olefin derived units. ### Claim 5 (depends on 3) The polyolefinic fiber according to claim 3, wherein component D) is a propylene homopolymer. ### Claim 6 (depends on 1) The polyolefinic fiber according to claim 1, wherein component A) is a polypropylene homopolymer. ### Claim 7 (depends on 1) The polyolefinic fiber according to claim 1, wherein component B) is a copolymer of ethylene and a C3-C8 alpha-olefin containing from 5% to 15% by weight of alpha-olefin units. ### Claim 8 (depends on 1) The polyolefinic fiber according to claim 1 wherein component C) is a copolymer of ethylene and propylene containing from 37% to 65% by weight of ethylene units. ### Claim 9 (depends on 1) The polyolefinic fiber according to claim 1, wherein component (A) has a melt flow rate ISO 1133, 230° C./2.16 kg, ranging between 50 and 200 g/10 min. ### Claim 10 (depends on 1) The polyolefinic fiber according to claim 1, wherein components (A)+(B) blended together have a melt flow rate ISO 1133, 230° C./2.16 kg, ranging between 0.1 and 70 g/10 min. ### Claim 11 (depends on 1) The polyolefinic fiber according to claim 1, wherein the polyolefin composition has a melt flow rate ISO 1133, 230° C./2.16 kg, between 0.5 to 25 g/10 min. ### Claim 12 (depends on 3) The polyolefinic fiber according to claim 3, wherein component D) has a melt flow rate ISO 1133, 230° C./2.16 kg, between 7 to 50 g/10 min. ### Claim 13 (depends on 3) The polyolefinic fiber according to claim 3, wherein component D) has a melt flow rate ISO 1133, 230° C./2.16 kg, between 12 to 40 g/10 min. ### Claim 14 (depends on 3) The polyolefinic fiber according to claim 3, wherein component D) is a propylene ethylene copolymer. ### Claim 15 (depends on 3) The polyolefinic fiber according to anyone of claim 3, wherein component D) is a propylene copolymer containing from 1.0 wt % to 6.0 wt %; of ethylene or C4-C8 alpha-olefin derived units.