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
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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
    • C08L23/16Ethylene-propylene or ethylene-propylene-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)
  • Polymers & Plastics (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Engineering & Computer Science (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 (https=)
EP (1) EP3491033B1 (https=)
JP (1) JP6957596B2 (https=)
KR (1) KR102413982B1 (https=)
CN (1) CN109601003A (https=)
BR (1) BR112019001249B1 (https=)
ES (1) ES2799716T3 (https=)
SG (1) SG11201900655UA (https=)
WO (1) WO2018022588A1 (https=)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102413982B1 (ko) 2016-07-29 2022-06-30 다우 글로벌 테크놀로지스 엘엘씨 다중모드 엘라스토머 생산용 혼합 촉매 시스템
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
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
JP7216184B2 (ja) * 2018-07-23 2023-01-31 エクソンモービル・ケミカル・パテンツ・インク バイモーダルゴム、熱可塑性加硫物の調製およびそれから作られた物品
CA3156383A1 (en) * 2019-11-04 2021-05-14 Andrew J. Young Bimodal catalyst systems
US12428504B2 (en) 2019-11-04 2025-09-30 Dow Global Technologies Llc Biphenylphenol polymerization catalysts
US12595322B2 (en) 2019-12-19 2026-04-07 Dow Global Technologies Llc Gas-phase biphenylphenol polymerization catalysts
WO2021128126A1 (en) 2019-12-26 2021-07-01 Dow Global Technologies Llc Alpha-olefin interpolymers with improved molecular design for photovoltaic encapsulants
KR20220123415A (ko) * 2019-12-26 2022-09-06 다우 글로벌 테크놀로지스 엘엘씨 탁월한 가공성을 갖는 중합체 조성물의 제조 공정
EP4081587B1 (en) 2019-12-26 2025-04-02 Dow Global Technologies LLC Ethylene/alpha-olefin interpolymer based compositions with improved balance of cure and processability
EP4291586A1 (en) * 2021-02-15 2023-12-20 Dow Global Technologies LLC Biphenylphenol polymerization catalysts having improved kinetic induction times
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
WO1993013143A1 (en) 1991-12-30 1993-07-08 The Dow Chemical Company Ethylene interpolymer polymerizations
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
RU2375381C2 (ru) 2004-03-17 2009-12-10 Дау Глобал Текнолоджиз Инк. Состав катализатора, содержащий челночный агент, для формирования мульти-блок-сополимера высшего олефина
JP2008509277A (ja) 2004-08-09 2008-03-27 ダウ グローバル テクノロジーズ インコーポレイティド ポリマーの製造のための担持ビス(ヒドロキシアリールアリールオキシ)触媒
US20070049711A1 (en) 2005-09-01 2007-03-01 Chi-I Kuo Catalyst compositions comprising support materials having an improved particle-size distribution
KR101519805B1 (ko) 2005-09-15 2015-05-12 다우 글로벌 테크놀로지스 엘엘씨 제어된 블록 서열 분포를 갖는 촉매적 올레핀 블록 공중합체
JP5230426B2 (ja) * 2005-09-15 2013-07-10 ダウ グローバル テクノロジーズ エルエルシー 多中心シャトリング剤(multi−centeredshuttlingagent)によるポリマー構造および分子量分布の制御
CN101490094B (zh) 2006-05-17 2013-06-26 陶氏环球技术有限责任公司 高温聚乙烯溶液聚合法
CN101970514B (zh) * 2008-03-13 2013-11-20 陶氏环球技术有限责任公司 乙烯与另一聚合物组合的长链支化(lcb)、嵌段或互联共聚物
TWI445751B (zh) 2008-07-16 2014-07-21 Univation Tech Llc 聚乙烯組成物
US8686087B2 (en) 2009-10-02 2014-04-01 Dow Global Technologies Llc Block composites in soft compounds
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
ES2659733T3 (es) * 2010-08-25 2018-03-19 Dow Global Technologies Llc Proceso de polimerización de olefina polimerizable y catalizador para ello
US9422383B2 (en) * 2011-12-20 2016-08-23 Dow Global Technologies Llc Ethylene/alpha-olefin/nonconjugated polyene interpolymers and processes to form the same
CN104854144B (zh) 2012-12-27 2018-08-07 陶氏环球技术有限责任公司 乙烯类聚合物
EP2938648B1 (en) 2012-12-27 2019-01-30 Dow Global Technologies LLC A polymerization process for producing ethylene based polymers
JP6348512B2 (ja) 2012-12-27 2018-06-27 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を製造するための重合法
BR112015031594B1 (pt) * 2013-06-24 2021-12-21 Dow Global Technologies Llc Composição de polipropileno reforçada
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
KR102413982B1 (ko) 2016-07-29 2022-06-30 다우 글로벌 테크놀로지스 엘엘씨 다중모드 엘라스토머 생산용 혼합 촉매 시스템

Also Published As

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

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