SG11201900655UA - Mixed catalyst systems for producing multimodal elastomers - Google Patents

Mixed catalyst systems for producing multimodal elastomers

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Publication number
SG11201900655UA
SG11201900655UA SG11201900655UA SG11201900655UA SG11201900655UA SG 11201900655U A SG11201900655U A SG 11201900655UA SG 11201900655U A SG11201900655U A SG 11201900655UA SG 11201900655U A SG11201900655U A SG 11201900655UA SG 11201900655U A SG11201900655U A SG 11201900655UA
Authority
SG
Singapore
Prior art keywords
dow
jackson
parkway
herbert
texas
Prior art date
Application number
SG11201900655UA
Other languages
English (en)
Inventor
Edmund M Carnahan
Philip P Fontaine
Carl N Iverson
Jeffrey C Munro
David M Pearson
Kim Walton
Original Assignee
Dow Global Technologies Llc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dow Global Technologies Llc filed Critical Dow Global Technologies Llc
Publication of SG11201900655UA publication Critical patent/SG11201900655UA/en

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    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F210/00Copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
    • C08F210/16Copolymers of ethene with alpha-alkenes, e.g. EP rubbers
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2/00Processes of polymerisation
    • C08F2/38Polymerisation using regulators, e.g. chain terminating agents, e.g. telomerisation
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F210/00Copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
    • C08F210/02Ethene
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F210/00Copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
    • C08F210/14Monomers containing five or more carbon atoms
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F4/00Polymerisation catalysts
    • C08F4/42Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors
    • C08F4/44Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides
    • C08F4/60Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides together with refractory metals, iron group metals, platinum group metals, manganese, rhenium technetium or compounds thereof
    • C08F4/62Refractory metals or compounds thereof
    • C08F4/64Titanium, zirconium, hafnium or compounds thereof
    • C08F4/64003Titanium, zirconium, hafnium or compounds thereof the metallic compound containing a multidentate ligand, i.e. a ligand capable of donating two or more pairs of electrons to form a coordinate or ionic bond
    • C08F4/64168Tetra- or multi-dentate ligand
    • C08F4/64186Dianionic ligand
    • C08F4/64193OOOO
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F4/00Polymerisation catalysts
    • C08F4/42Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors
    • C08F4/44Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides
    • C08F4/60Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides together with refractory metals, iron group metals, platinum group metals, manganese, rhenium technetium or compounds thereof
    • C08F4/62Refractory metals or compounds thereof
    • C08F4/64Titanium, zirconium, hafnium or compounds thereof
    • C08F4/659Component covered by group C08F4/64 containing a transition metal-carbon bond
    • C08F4/65904Component covered by group C08F4/64 containing a transition metal-carbon bond in combination with another component of C08F4/64
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F4/00Polymerisation catalysts
    • C08F4/42Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors
    • C08F4/44Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides
    • C08F4/60Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides together with refractory metals, iron group metals, platinum group metals, manganese, rhenium technetium or compounds thereof
    • C08F4/62Refractory metals or compounds thereof
    • C08F4/64Titanium, zirconium, hafnium or compounds thereof
    • C08F4/659Component covered by group C08F4/64 containing a transition metal-carbon bond
    • C08F4/6592Component covered by group C08F4/64 containing a transition metal-carbon bond containing at least one cyclopentadienyl ring, condensed or not, e.g. an indenyl or a fluorenyl ring
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04Homopolymers or copolymers of ethene
    • C08L23/08Copolymers of ethene
    • C08L23/0807Copolymers of ethene with unsaturated hydrocarbons only containing four or more carbon atoms
    • C08L23/0815Copolymers of ethene with unsaturated hydrocarbons only containing four or more carbon atoms with aliphatic 1-olefins containing one carbon-to-carbon double bond
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/10Homopolymers or copolymers of propene
    • C08L23/12Polypropene
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/16Ethene-propene or ethene-propene-diene copolymers
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2/00Processes of polymerisation
    • C08F2/01Processes of polymerisation characterised by special features of the polymerisation apparatus used
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2500/00Characteristics or properties of obtained polyolefins; Use thereof
    • C08F2500/05Bimodal or multimodal molecular weight distribution
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2500/00Characteristics or properties of obtained polyolefins; Use thereof
    • C08F2500/08Low density, i.e. < 0.91 g/cm3
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00Polymer mixtures characterised by other features
    • C08L2205/02Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C08L2205/025Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2207/00Properties characterising the ingredient of the composition
    • C08L2207/04Thermoplastic elastomer
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2207/00Properties characterising the ingredient of the composition
    • C08L2207/06Properties of polyethylene

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Graft Or Block Polymers (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Polyoxymethylene Polymers And Polymers With Carbon-To-Carbon Bonds (AREA)
SG11201900655UA 2016-07-29 2017-07-25 Mixed catalyst systems for producing multimodal elastomers SG11201900655UA (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201662368244P 2016-07-29 2016-07-29
PCT/US2017/043674 WO2018022588A1 (en) 2016-07-29 2017-07-25 Mixed catalyst systems for producing multimodal elastomers

Publications (1)

Publication Number Publication Date
SG11201900655UA true SG11201900655UA (en) 2019-02-27

Family

ID=59501639

Family Applications (1)

Application Number Title Priority Date Filing Date
SG11201900655UA SG11201900655UA (en) 2016-07-29 2017-07-25 Mixed catalyst systems for producing multimodal elastomers

Country Status (9)

Country Link
US (1) US11155658B2 (enExample)
EP (1) EP3491033B1 (enExample)
JP (1) JP6957596B2 (enExample)
KR (1) KR102413982B1 (enExample)
CN (1) CN109601003A (enExample)
BR (1) BR112019001249B1 (enExample)
ES (1) ES2799716T3 (enExample)
SG (1) SG11201900655UA (enExample)
WO (1) WO2018022588A1 (enExample)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6957596B2 (ja) 2016-07-29 2021-11-02 ダウ グローバル テクノロジーズ エルエルシー 多峰性エラストマー生成用混合触媒系
US10442921B2 (en) * 2017-04-19 2019-10-15 Nova Chemicals (International) S.A. Means for increasing the molecular weight and decreasing the density employing mixed homogeneous catalyst formulations
US10442920B2 (en) * 2017-04-19 2019-10-15 Nova Chemicals (International) S.A. Means for increasing the molecular weight and decreasing the density of ethylene interpolymers employing homogeneous and heterogeneous catalyst formulations
EP3827033B1 (en) * 2018-07-23 2025-01-01 ExxonMobil Chemical Patents Inc. Preparation of bimodal rubber, thermoplastic vulcanizates, and articles made therefrom
CN114630843A (zh) * 2019-11-04 2022-06-14 陶氏环球技术有限责任公司 双峰催化剂体系
EP4055069A1 (en) 2019-11-04 2022-09-14 Dow Global Technologies LLC Biphenylphenol polymerization catalysts
WO2021127150A1 (en) * 2019-12-19 2021-06-24 Dow Global Technologies Llc Gas-phase biphenylphenol polymerization catalysts
JP7713942B2 (ja) * 2019-12-26 2025-07-28 ダウ グローバル テクノロジーズ エルエルシー 優れた加工性を有するポリマー組成物の製造のための方法
JP7429788B2 (ja) 2019-12-26 2024-02-08 ダウ グローバル テクノロジーズ エルエルシー 改善されたバランスの硬化及び加工性を有するエチレン/アルファ-オレフィンインターポリマー系組成物
KR102554319B1 (ko) * 2021-04-19 2023-07-11 한화토탈에너지스 주식회사 폴리올레핀 탄성중합체 제조 공정
WO2025034262A1 (en) 2023-08-07 2025-02-13 ExxonMobil Technology and Engineering Company Ethylene copolymer compositions and articles made thereof
WO2025096296A1 (en) * 2023-10-31 2025-05-08 Dow Global Technologies Llc Multimodal polymerization processes with multi-catalyst systems

Family Cites Families (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5272236A (en) 1991-10-15 1993-12-21 The Dow Chemical Company Elastic substantially linear olefin polymers
US5278272A (en) 1991-10-15 1994-01-11 The Dow Chemical Company Elastic substantialy linear olefin polymers
JP3157163B2 (ja) 1991-12-30 2001-04-16 ザ・ダウ・ケミカル・カンパニー エチレンインターポリマーの重合
FI98819C (fi) * 1993-03-26 1997-08-25 Borealis Polymers Oy Prosessi olefiinipolymeerien valmistamiseksi ja prosessilla valmistetut tuotteet
US6610408B1 (en) * 1996-11-08 2003-08-26 Solvay Engineered Polymers TPO blends containing multimodal elastomers
US6812289B2 (en) 1996-12-12 2004-11-02 Dow Global Technologies Inc. Cast stretch film of interpolymer compositions
US6069213A (en) 1997-12-16 2000-05-30 Union Carbide Chemicals & Plastics Technology Corporation Mixed catalyst system
MY131000A (en) * 2001-03-16 2007-07-31 Dow Global Technologies Inc High melt strength polymers and method of making same
ES2342895T3 (es) 2004-03-17 2010-07-16 Dow Global Technologies Inc. Composicion catalitica que comprende agente de transferencia para la formacion de copolimero de multiples bloques de etileno.
KR101195320B1 (ko) 2004-08-09 2012-10-29 다우 글로벌 테크놀로지스 엘엘씨 중합체를 제조하기 위한 지지된비스(하이드록시아릴아릴옥시) 촉매
US20070049711A1 (en) 2005-09-01 2007-03-01 Chi-I Kuo Catalyst compositions comprising support materials having an improved particle-size distribution
WO2007035493A2 (en) * 2005-09-15 2007-03-29 Dow Global Technologies Inc. Control of polymer architecture and molecular weight distribution via multi-centered shuttling agent
EP1926763B1 (en) 2005-09-15 2014-10-29 Dow Global Technologies LLC Catalytic olefin block copolymers with controlled block sequence distribution
KR101384380B1 (ko) 2006-05-17 2014-04-10 다우 글로벌 테크놀로지스 엘엘씨 폴리프로필렌 용액 중합 방법
JP5714913B2 (ja) * 2008-03-13 2015-05-07 ダウ グローバル テクノロジーズ エルエルシー 他の1種のポリマーと組み合わせた、長鎖分岐(lcb)、ブロック、または相互連結エチレンコポリマー
TWI445751B (zh) 2008-07-16 2014-07-21 Univation Tech Llc 聚乙烯組成物
US8476366B2 (en) 2009-10-02 2013-07-02 Dow Global Technologies, Llc Block compositions in thermoplastic vulcanizate applications
US8679639B2 (en) * 2009-11-24 2014-03-25 Dow Global Technologies Llc Extrusion coating composition
US8609794B2 (en) 2010-05-17 2013-12-17 Dow Global Technologies, Llc. Process for selectively polymerizing ethylene and catalyst therefor
CN105294905A (zh) * 2010-08-25 2016-02-03 陶氏环球技术有限责任公司 聚合可聚合烯烃的方法以及用于该方法的催化剂
EP2794693B1 (en) * 2011-12-20 2020-09-23 Dow Global Technologies LLC Ethylene/alpha-olefin/nonconjugated polyene interpolymers and processes to form the same
WO2014105414A1 (en) 2012-12-27 2014-07-03 Dow Global Technologies Llc A polymerization process for producing ethylene based polymers
CN104884484B (zh) 2012-12-27 2018-09-14 陶氏环球技术有限责任公司 用于产生乙烯类聚合物的聚合方法
JP6653173B2 (ja) 2012-12-27 2020-02-26 ダウ グローバル テクノロジーズ エルエルシー エチレン系ポリマー
SG11201510299TA (en) * 2013-06-24 2016-01-28 Dow Global Technologies Llc Reinforced polypropylene composition
CN103421138B (zh) 2013-07-21 2015-10-07 浙江大学 一种单反应器制备宽/双峰聚乙烯的方法
JP6957596B2 (ja) 2016-07-29 2021-11-02 ダウ グローバル テクノロジーズ エルエルシー 多峰性エラストマー生成用混合触媒系

Also Published As

Publication number Publication date
KR102413982B1 (ko) 2022-06-30
BR112019001249B1 (pt) 2022-10-18
JP6957596B2 (ja) 2021-11-02
JP2019525986A (ja) 2019-09-12
EP3491033A1 (en) 2019-06-05
WO2018022588A1 (en) 2018-02-01
KR20190039136A (ko) 2019-04-10
EP3491033B1 (en) 2020-05-13
BR112019001249A2 (pt) 2019-04-30
US11155658B2 (en) 2021-10-26
US20190276573A1 (en) 2019-09-12
ES2799716T3 (es) 2020-12-21
CN109601003A (zh) 2019-04-09

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