# US 10,865,296 B2 · Bimodal polyethylene composition and pipe comprising the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,865,296 B2 - Document ID: US10865296B2 - Status: Granted - Kind: B2 - Application number: 16/332,093 - Filed: 2017-09-08 - Published: 2019-11-28 - Granted: 2020-12-15 - Earliest claimed: 2016-09-12 - Assignees: Thai Polyethylene Co., Ltd.; SCG Chemicals Co., Ltd. - Applicants: Thai Polyethylene Co., Ltd.; SCG Chemicals Co., Ltd. - Inventors: Natthaporn Suchao-In; Warachad Klomkamol; Patcharin Samphawamontri - Web page: https://patentgrep.com/patent/US10865296B2 ## CPC - C08L 23/06: Polyethylene - C08F 110/02: Ethene - C08F 210/14: Monomers containing five or more carbon atoms - C08F 210/16: Copolymers of ethene with alpha-alkenes, e.g. EP rubbers - C08L 23/0815: {with aliphatic 1-olefins containing one carbon-to-carbon double bond} - C08L 2203/18: used for pipes - C08L 2205/025: containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure - C08L 2207/068: Ultra high molecular weight polyethylene - C08L 2308/00: Chemical blending or stepwise polymerisation process with the same catalyst - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS ## Abstract The present invention relates to a bimodal polyethylene composition comprising a low molecular weight polyethylene homopolymer fraction and high molecular weight polyethylene copolymer fraction having a C4 to C10 α-olefin comonomer content of 0.25 to 3% mol with respect to the total monomer comprised in the high molecular weight polyethylene comonomer fraction, wherein the content of the low molecular weight polyethylene is from 50 to 60 wt % with respect to the total weight of the bimodal polyethylene composition; and the bimodal polyethylene composition has a soluble fraction according to Temperature Rising Elution Fractionation in 1,2,4-trichlorobenzene with 300 ppm of butylated hydroxytoluene at 150° C. of less than 6 wt %; and a pipe comprising the same. ## Claims ### Claim 1 A bimodal polyethylene composition comprising a low molecular weight polyethylene homopolymer fraction and high molecular weight polyethylene copolymer fraction having a C4 to C10 α-olefin comonomer content of 0.25 to 3% mol with respect to the total monomer comprised in the high molecular weight polyethylene comonomer fraction, wherein the content of the low molecular weight polyethylene is from 50 to 60% wt with respect to the total weight of the bimodal polyethylene composition; and the bimodal polyethylene composition has a soluble fraction according to Temperature Rising Elution Fractionation in 1,2,4-trichlorobenzene with 300 ppm of butylated hydroxytoluene at 150° C. of less than 6% wt. ### Claim 2 (depends on 1) The bimodal polyethylene composition according to claim 1, wherein the bimodal polyethylene composition has a density from 0.945 to 0.965 g/cm3 and a MI5 of 0.10 to 0.50 g/10 min. ### Claim 3 (depends on 1) The bimodal polyethylene composition according to claim 1, wherein the bimodal polyethylene composition comprises 50 to 60% wt with respect to the total weight of the bimodal polyethylene composition of the low molecular weight polyethylene homopolymer fraction and 40 to 50% wt with respect to the total weight of the bimodal polyethylene composition of the high molecular weight polyethylene copolymer fraction. ### Claim 4 (depends on 1) The bimodal polyethylene composition according to claim 1, wherein the bimodal polyethylene composition has the soluble fraction according to Temperature Rising Elution Fractionation in 1,2,4-trichlorobenzene with 300 ppm of butylated hydroxytoluene at 150° C. of 2 to 5.9% wt. ### Claim 5 (depends on 1) The bimodal polyethylene composition according to claim 1, wherein the bimodal polyethylene composition has the soluble fraction according to Temperature Rising Elution Fractionation in 1,2,4-trichlorobenzene with 300 ppm of butylated hydroxytoluene at 150° C. of 3 to 5.9% wt. ### Claim 6 (depends on 1) The bimodal polyethylene composition according to claim 1, wherein the high molecular weight polyethylene copolymer fraction has a C4 to C10 α-olefin comonomer content of 0.25 to 2% mol with respect to the total monomer comprised in the high molecular weight polyethylene comonomer fraction. ### Claim 7 (depends on 1) The bimodal polyethylene composition according to claim 1, wherein the high molecular weight polyethylene copolymer fraction has a C4 to C10 α-olefin comonomer content of 0.5 to 1% mol with respect to the total monomer comprised in the high molecular weight polyethylene comonomer fraction. ### Claim 8 (depends on 1) The bimodal polyethylene composition according to claim 1, wherein the low molecular weight polyethylene is from 50 to 55% wt with respect to the total weight of the bimodal polyethylene composition. ### Claim 9 (depends on 1) The bimodal polyethylene composition according to claim 1, wherein the high molecular weight polyethylene is from 45 to 50% wt with respect to the total weight of the bimodal polyethylene composition. ### Claim 10 (depends on 1) The bimodal polyethylene composition according to claim 1, wherein the C4 to C10 α-olefin comonomer is selected from the group consisting of 1-butene, 1-hexene, 1-octene, 1-decene and mixtures thereof. ### Claim 11 (depends on 1) Pipe comprising the bimodal polyethylene composition according to claim 1. ### Claim 12 (depends on 2) The bimodal polyethylene composition of claim 2, having a density from 0.952 to 0.965 g/cm3. ### Claim 13 (depends on 12) The bimodal polyethylene composition of claim 12, having a density from 0.955 to 0.963 g/cm3. ### Claim 14 (depends on 2) The bimodal polyethylene composition of claim 2, having a MI5 from 0.15 to 0.35 g/cm3. ### Claim 15 (depends on 14) The bimodal polyethylene composition of claim 14, having a MI5 from 0.18 to 0.28 g/cm3. ### Claim 16 (depends on 10) The bimodal polyethylene composition of claim 10, wherein the C4 to C10 α-olefin comonomer is 1-hexene.