CN1093141C - 最大分子量出现在共聚单体含量最高的组合物部分中的聚烯烃共聚物组合物 - Google Patents

最大分子量出现在共聚单体含量最高的组合物部分中的聚烯烃共聚物组合物 Download PDF

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CN1093141C
CN1093141C CN97195734A CN97195734A CN1093141C CN 1093141 C CN1093141 C CN 1093141C CN 97195734 A CN97195734 A CN 97195734A CN 97195734 A CN97195734 A CN 97195734A CN 1093141 C CN1093141 C CN 1093141C
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composition
molecular weight
comonomer
polyolefin copolymer
copolymer composition
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Expired - Lifetime
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CN97195734A
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Chinese (zh)
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CN1222919A (zh
Inventor
L·D·卡笛
C·J·福耶
P·霍瓦德
T·P·卡加拉
P·J·麦朵克斯
I·M·穆诺
D·R·帕里克
S·R·帕提格顿
K·P·彼尔
L·斯皮塞
W·R·范沃肯伯格
P·S·威廉姆斯
D·R·威尔森
J·M·温特
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Ineos Commercial Services UK Ltd
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BP Chemicals Ltd
Dow Chemical Co
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    • 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
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    • C08F210/00Copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
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    • 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
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    • C08L23/04Homopolymers or copolymers of ethene
    • C08L23/08Copolymers of ethene
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    • 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
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    • 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
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    • C08F4/659Component covered by group C08F4/64 containing a transition metal-carbon bond
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    • 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
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    • 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
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    • 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
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    • C08F4/65922Component 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 containing at least two cyclopentadienyl rings, fused or not
    • C08F4/65927Component 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 containing at least two cyclopentadienyl rings, fused or not two cyclopentadienyl rings being mutually bridged
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    • C08J2323/00Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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CN97195734A 1996-05-17 1997-05-16 最大分子量出现在共聚单体含量最高的组合物部分中的聚烯烃共聚物组合物 Expired - Lifetime CN1093141C (zh)

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US1714796P 1996-05-17 1996-05-17
US60/017,147 1996-05-17

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CN1222919A CN1222919A (zh) 1999-07-14
CN1093141C true CN1093141C (zh) 2002-10-23

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JP (1) JP3901221B2 (enExample)
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AT (1) ATE212648T1 (enExample)
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Families Citing this family (125)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6506866B2 (en) * 1994-11-17 2003-01-14 Dow Global Technologies Inc. Ethylene copolymer compositions
JPH09309926A (ja) * 1996-05-17 1997-12-02 Dow Chem Co:The エチレン共重合体の製造方法
US6416833B1 (en) * 1997-08-22 2002-07-09 Dupont Canada Inc. Interpolymer film pouch
CA2245375C (en) * 1998-08-19 2006-08-15 Nova Chemicals Ltd. Dual reactor polyethylene process using a phosphinimine catalyst
WO2000014129A1 (en) * 1998-09-04 2000-03-16 The Dow Chemical Company Long chain branched ethylene homopolymer made by a slurry process and blends thereof
JP2002524620A (ja) * 1998-09-16 2002-08-06 ザ ダウ ケミカル カンパニー スラリー重合方法およびポリマー組成物
FI990948A0 (fi) * 1999-04-27 1999-04-27 Borealis As Ei-ristisilloitettu polyeteeni
JP5314823B2 (ja) * 1999-05-05 2013-10-16 イネオス ユーロープ リミテッド エチレンコポリマー及びそのフィルム
AU2005200546B2 (en) * 1999-05-05 2007-03-29 Bp Chemicals Limited Ethylene copolymers and films thereof
US7041617B2 (en) 2004-01-09 2006-05-09 Chevron Phillips Chemical Company, L.P. Catalyst compositions and polyolefins for extrusion coating applications
ATE431379T1 (de) 2000-06-01 2009-05-15 Ineos Europe Ltd Neue polyethenfilme
US6943133B2 (en) 2000-10-20 2005-09-13 Univation Technologies, Llc Diene functionalized catalyst supports and supported catalyst compositions
US6936675B2 (en) 2001-07-19 2005-08-30 Univation Technologies, Llc High tear films from hafnocene catalyzed polyethylenes
AU2002320633B2 (en) 2001-07-19 2005-08-25 Univation Technologies, Llc Polyethylene films with improved physical properties
PL203864B1 (pl) * 2001-08-17 2009-11-30 Dow Global Technologies Inc Kompozycje polietylenowe i zastosowanie kompozycji polietylenowej
EP1312625A1 (en) * 2001-11-20 2003-05-21 BP Chemicals SNC Gas phase polymerization process
TWI300782B (en) * 2002-08-29 2008-09-11 Ineos Europe Ltd Supported polymerisation catalysts
JP4596510B2 (ja) * 2002-11-18 2010-12-08 旭化成ケミカルズ株式会社 ポリエチレン組成物
SE0300195D0 (sv) 2003-01-28 2003-01-28 Borealis Tech Oy Coating composition, method of preparation thereofand substrate coated therewith
JP4260501B2 (ja) * 2003-02-07 2009-04-30 株式会社プライムポリマー 二軸延伸用ポリエチレン系樹脂組成物および延伸フィルム
ATE469927T1 (de) 2003-03-21 2010-06-15 Dow Global Technologies Inc Verfahren zur herstellung von polyolefinen mit kontrollierter morphologie
JP4903357B2 (ja) * 2003-03-28 2012-03-28 住友化学株式会社 エチレン重合体
US6953764B2 (en) 2003-05-02 2005-10-11 Dow Global Technologies Inc. High activity olefin polymerization catalyst and process
EP1655336B1 (en) * 2004-11-03 2007-01-10 Borealis Technology Oy Multimodal polyethylene composition for injection moulded caps and closure articles
US7598327B2 (en) 2004-11-10 2009-10-06 Chevron Phillips Chemical Company Lp Method for polymerizing olefins in a gas phase reactor using a seedbed during start-up
GB0425443D0 (en) 2004-11-18 2004-12-22 Bp Chem Int Ltd Supported polymerisation catalysts
ES2340707T5 (en) * 2005-02-09 2025-05-09 Ineos Sales Uk Ltd Copolymers and films thereof
ATE388175T1 (de) 2005-04-12 2008-03-15 Borealis Tech Oy Polyethylenfilm mit verbesserter verarbeitbarkeit und verbesserten mechanischen eigenschaften
US7226886B2 (en) 2005-09-15 2007-06-05 Chevron Phillips Chemical Company, L.P. Polymerization catalysts and process for producing bimodal polymers in a single reactor
US7312283B2 (en) * 2005-08-22 2007-12-25 Chevron Phillips Chemical Company Lp Polymerization catalysts and process for producing bimodal polymers in a single reactor
US7625982B2 (en) * 2005-08-22 2009-12-01 Chevron Phillips Chemical Company Lp Multimodal polyethylene compositions and pipe made from same
EP1772485A1 (en) 2005-10-07 2007-04-11 Borealis Technology Oy Polyethylene composition with improved stress crack resistance/stiffness relation for blow moulding
EP1772486A1 (en) 2005-10-07 2007-04-11 Borealis Technology Oy Polyethylene composition for injection moulding with improved stress crack/stiffness relation and impact resistance
EP1803747A1 (en) 2005-12-30 2007-07-04 Borealis Technology Oy Surface-modified polymerization catalysts for the preparation of low-gel polyolefin films
US7619047B2 (en) * 2006-02-22 2009-11-17 Chevron Phillips Chemical Company, Lp Dual metallocene catalysts for polymerization of bimodal polymers
EP1834983A1 (en) * 2006-03-14 2007-09-19 Ineos Europe Limited Polymer films
GB0610668D0 (en) * 2006-05-30 2006-07-12 Nova Chem Int Sa Supported antistatic polymerization catalysts
ATE535569T1 (de) 2006-12-29 2011-12-15 Borealis Tech Oy Polyethylenmassen für blasgeformte transportverpackungsartikel
EP1980577A1 (en) * 2007-04-10 2008-10-15 Borealis Technology OY Pipes comprising ß-nucleated propylene copolymers
EP2147027B1 (en) 2007-05-16 2017-09-27 LG Chem, Ltd. Long chain-branched ethylene-1-butene copolymer
TW200932762A (en) 2007-10-22 2009-08-01 Univation Tech Llc Polyethylene compositions having improved properties
EP2058337A1 (en) * 2007-11-06 2009-05-13 Total Petrochemicals Research Feluy Process for preparing a polyethylene resin in a double loop reactor with a mixture of bis-indenyl and bis-tetrahydroindenyl catalyst components
TW200936619A (en) * 2007-11-15 2009-09-01 Univation Tech Llc Polymerization catalysts, methods of making, methods of using, and polyolefin products made therefrom
US8436114B2 (en) 2010-10-21 2013-05-07 Exxonmobil Chemical Patents Inc. Polyethylene and process for production thereof
US8431661B2 (en) 2010-10-21 2013-04-30 Exxonmobil Chemical Patents Inc. Polyethylene and process for production thereof
US8507103B2 (en) 2007-12-18 2013-08-13 Exxonmobil Chemical Patents Inc. Polyethylene and process for production thereof
US8202958B2 (en) 2008-03-13 2012-06-19 Dow Global Technologies Llc Long chain branched (LCB), block or interconnected copolymers of ethylene in combination with one other polymer
EP2119732A1 (en) 2008-05-16 2009-11-18 Borealis Technology Oy Metallocene catalyst compositions with improved properties, process for its preparation and use for preparing polyolefin homo- or copolymers
EP2177548A1 (en) 2008-10-14 2010-04-21 Ineos Europe Limited Copolymers and films thereof
JP2010159398A (ja) * 2008-12-10 2010-07-22 Sumitomo Chemical Co Ltd 放射線照射用包装材、包装食品の殺虫又は殺菌方法、包装農作物の発芽抑制方法、包装食品、及び、包装農作物
CN102257017B (zh) 2008-12-18 2014-02-12 尤尼威蒂恩技术有限责任公司 用于聚合反应种子床处理的方法
US8114946B2 (en) * 2008-12-18 2012-02-14 Chevron Phillips Chemical Company Lp Process for producing broader molecular weight distribution polymers with a reverse comonomer distribution and low levels of long chain branches
AU2014215964B2 (en) * 2008-12-18 2015-05-28 Chevron Phillips Chemical Company Lp Process for producing broader molecular weight distribution polymers with a reverse comonomer distribution and low levels of long chain branches
WO2010080871A1 (en) 2009-01-08 2010-07-15 Univation Technologies, Llc Additive for gas phase polymerization processes
JP5661645B2 (ja) 2009-01-08 2015-01-28 ユニベーション・テクノロジーズ・エルエルシー ポリオレフィン重合プロセス用の添加剤
US20120095154A1 (en) 2009-04-09 2012-04-19 Klaus Bernreitner Thermoplastic polyolefin composition
CN102482372B (zh) 2009-07-23 2013-09-04 尤尼威蒂恩技术有限公司 聚合反应系统
RU2549541C2 (ru) * 2009-07-28 2015-04-27 Юнивейшн Текнолоджиз, Ллк Способ полимеризации с использованием нанесенного катализатора с затрудненной геометрией
WO2011078923A1 (en) 2009-12-23 2011-06-30 Univation Technologies, Llc Methods for producing catalyst systems
EP2348057A1 (en) 2010-01-21 2011-07-27 INEOS Manufacturing Belgium NV Novel polymers
ES2394253T3 (es) 2010-01-29 2013-01-30 Borealis Ag Composición de moldeo de polietileno con una relación de craqueo por tensión/rigidez y resistencia al impacto mejoradas
EP2528970B1 (en) 2010-01-29 2015-07-29 Borealis AG Improving homogeneity in polyethylene blends
EP2354183B1 (en) 2010-01-29 2012-08-22 Borealis AG Moulding composition
US8383754B2 (en) 2010-04-19 2013-02-26 Chevron Phillips Chemical Company Lp Catalyst compositions for producing high Mz/Mw polyolefins
EP2410011A1 (en) 2010-07-23 2012-01-25 INEOS Manufacturing Belgium NV Polyethylene composition
US8623980B2 (en) * 2010-12-21 2014-01-07 Exxonmobil Research And Engineering Company Process for making a saturated dendritic hydrocarbon polymer
WO2012087560A1 (en) 2010-12-22 2012-06-28 Univation Technologies, Llc Additive for polyolefin polymerization processes
EP2744858B1 (en) 2011-08-19 2017-03-01 Borealis AG Heterophasic system with improved surface properties
WO2013029223A1 (en) * 2011-08-26 2013-03-07 Dow Global Technologies Llc Bioriented polyethylene film
MX348973B (es) * 2011-11-23 2017-07-05 Dow Global Technologies Llc Polimeros a base de etileno de baja densidad con extractos a pesos moleculares mas bajos.
ES2685520T3 (es) 2011-12-01 2018-10-09 Ineos Europe Ag Mezclas de polímeros
ES2682252T3 (es) 2011-12-14 2018-09-19 Ineos Europe Ag Nuevos polímeros
EP2610269A1 (en) 2011-12-28 2013-07-03 Saudi Basic Industries Corporation Catalyst composition and method for preparing the same
US20150030852A1 (en) * 2012-01-26 2015-01-29 Ineos Europe Ag Copolymers for wire and cable applications
US9115233B2 (en) 2012-06-21 2015-08-25 Nova Chemicals (International) S.A. Ethylene copolymer compositions, film and polymerization processes
CA2798855C (en) 2012-06-21 2021-01-26 Nova Chemicals Corporation Ethylene copolymers having reverse comonomer incorporation
US8895679B2 (en) 2012-10-25 2014-11-25 Chevron Phillips Chemical Company Lp Catalyst compositions and methods of making and using same
US8937139B2 (en) 2012-10-25 2015-01-20 Chevron Phillips Chemical Company Lp Catalyst compositions and methods of making and using same
ES2663020T3 (es) 2012-12-14 2018-04-10 Nova Chemicals (International) S.A. Composiciones, película y procesos de la polimerización de copolímeros de etileno
EP2746320A1 (en) * 2012-12-20 2014-06-25 Basell Polyolefine GmbH Polyethylene composition having high mechanical properties
CA2800056A1 (en) 2012-12-24 2014-06-24 Nova Chemicals Corporation Polyethylene blend compositions
BR112015015373B1 (pt) 2012-12-28 2020-12-15 Univation Technologies, Llc Método para integração da produção de aluminoxano na produçâo de um catalisador
CN105121015A (zh) 2013-01-14 2015-12-02 尤尼威蒂恩技术有限责任公司 制备高产率催化剂系统的方法
US9034991B2 (en) 2013-01-29 2015-05-19 Chevron Phillips Chemical Company Lp Polymer compositions and methods of making and using same
US8877672B2 (en) 2013-01-29 2014-11-04 Chevron Phillips Chemical Company Lp Catalyst compositions and methods of making and using same
AP2015008887A0 (en) 2013-05-09 2015-11-30 Abu Dhabi Polymers Company Ltd Borouge Llc Hdpe
CN105452313B (zh) * 2013-07-09 2021-10-26 陶氏环球技术有限责任公司 具有改进的粒料流动性的乙烯/α-烯烃互聚物
KR101657680B1 (ko) 2013-09-30 2016-09-19 주식회사 엘지화학 폴리올레핀
US10221262B2 (en) 2013-10-25 2019-03-05 Dsm Ip Assets B.V. Preparation of ultra high molecular weight ethylene copolymer
EP2878623B1 (en) 2013-11-28 2018-07-11 Abu Dhabi Polymers Company Limited (Borouge) Multimodal polymer
ES2621732T3 (es) 2014-01-06 2017-07-05 Borealis Ag Mezcla de polímero: HDPE con copolímero de etileno-norborneno o propileno-norborneno
US9765164B2 (en) 2014-06-27 2017-09-19 Dow Global Technologies Llc Polyolefin compositions and uses thereof
EP3040376B2 (en) 2014-12-30 2020-09-16 Abu Dhabi Polymers Company Limited (Borouge) L.L.C. Multimodal polyethylene
ES2713632T5 (en) 2014-12-30 2025-10-09 Abu Dhabi Polymers Co Ltd Borouge Llc Hdpe
CN107206655B (zh) 2015-01-21 2019-09-06 尤尼威蒂恩技术有限责任公司 用于控制聚合物链断裂的方法
US10682797B2 (en) 2015-01-21 2020-06-16 Univation Technologies, Llc Methods for gel reduction in polyolefins
ES2928549T3 (es) 2015-04-23 2022-11-21 Univation Tech Llc Copolímeros de polietileno que tienen una distribución de comonómero particular
WO2017014839A1 (en) 2015-07-20 2017-01-26 Exxonmobil Chemical Patents Inc. High softening point hydrocarbon resins
EP3327072B1 (en) 2016-11-24 2019-08-14 Abu Dhabi Polymers Co. Ltd (Borouge) Llc. Polyethylene composition for drip irrigation pipes or tapes
EP3335874A1 (en) 2016-12-15 2018-06-20 Borealis AG Biaxially oriented articles comprising multimodal polyethylene polymer
WO2018172510A1 (en) 2017-03-24 2018-09-27 Borealis Ag Oriented multilayer barrier film
CA2969627C (en) * 2017-05-30 2024-01-16 Nova Chemicals Corporation Ethylene copolymer having enhanced film properties
EP3710500A1 (en) 2017-11-15 2020-09-23 ExxonMobil Chemical Patents Inc. Polymerization processes
US10954328B2 (en) 2017-11-15 2021-03-23 Exxonmobil Chemical Patents Inc. Polymerization processes
WO2019099589A1 (en) 2017-11-15 2019-05-23 Exxonmobil Chemical Patents Inc. Polymerization processes
CN111372958B (zh) 2017-12-18 2023-06-30 陶氏环球技术有限责任公司 二茂锆-二茂钛催化剂体系
KR102671695B1 (ko) 2018-11-29 2024-06-05 롯데케미칼 주식회사 우수한 용융 특성을 지닌 폴리프로필렌 수지 및 그 제조 방법
CA3136026C (en) 2019-04-09 2023-02-07 Borealis Ag Collation shrink film
WO2020245425A1 (en) 2019-06-07 2020-12-10 Borealis Ag Multilayer machine direction oriented films for sealing
WO2022034168A1 (en) 2020-08-12 2022-02-17 Borealis Ag Multilayer film with low seal initiation temperature
KR102611798B1 (ko) * 2020-11-23 2023-12-12 한화솔루션 주식회사 올레핀계 중합체, 그로부터 제조된 필름 및 그 제조방법
EP4112491A1 (en) 2021-06-29 2023-01-04 Abu Dhabi Polymers Company Limited (Borouge) LLC Bottle closure assembly
EP4151677A1 (en) 2021-09-21 2023-03-22 Borealis AG Biaxially oriented film
ES2983023T3 (es) 2021-10-07 2024-10-21 Borealis Ag Película orientada biaxialmente
EP4163309A1 (en) 2021-10-07 2023-04-12 Borealis AG Hdpe
EP4239014A1 (en) 2022-03-02 2023-09-06 Borealis AG Film comprising a polyethylene composition
EP4239015B1 (en) 2022-03-02 2024-05-22 Borealis AG Monoaxially oriented film comprising a polyethylene composition
WO2023194335A1 (en) 2022-04-06 2023-10-12 Borealis Ag Multilayered film
EP4306442B1 (en) 2022-07-14 2025-05-07 Borealis AG Composition
EP4306444B1 (en) 2022-07-14 2025-03-05 Borealis AG Composition
EP4386046A1 (en) 2022-12-16 2024-06-19 Borealis AG Composition
EP4389776A1 (en) 2022-12-20 2024-06-26 Borealis AG Process
EP4431552B1 (en) 2023-03-14 2025-07-30 Borealis GmbH Biaxially oriented polyethylene film with improved stiffness
EP4455171A1 (en) 2023-04-28 2024-10-30 Borealis AG Moulded articles
WO2025003435A1 (en) 2023-06-30 2025-01-02 Borealis Ag Process

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5264405A (en) * 1989-09-13 1993-11-23 Exxon Chemical Patents Inc. Monocyclopentadienyl titanium metal compounds for ethylene-α-olefin-copolymer production catalysts
DE68928100T2 (de) * 1988-09-30 1997-11-06 Exxon Chemical Patents Inc Lineare ethylen-copolymermischungen von copolymeren mit engen molekulargewichts- und kompositionsverteilungen
US5382631A (en) * 1988-09-30 1995-01-17 Exxon Chemical Patents Inc. Linear ethylene interpolymer blends of interpolymers having narrow molecular weight and composition distributions
US5382630A (en) * 1988-09-30 1995-01-17 Exxon Chemical Patents Inc. Linear ethylene interpolymer blends of interpolymers having narrow molecular weight and composition distribution
NZ235032A (en) * 1989-08-31 1993-04-28 Dow Chemical Co Constrained geometry complexes of titanium, zirconium or hafnium comprising a substituted cyclopentadiene ligand; use as olefin polymerisation catalyst component
IT1243430B (it) * 1990-09-28 1994-06-10 Himont Inc Composizioni di polimeri cristallini del propilene aventi bassa temperatura
US5281679A (en) * 1991-11-07 1994-01-25 Exxon Chemical Patents Inc. Catalyst and method of broadening polymer molecular weight distribution and increasing polymer tensile impact strength and products made thereof
GB2285536B (en) * 1992-07-30 1997-01-29 Komatsu Mfg Co Ltd Positive temperature coefficient thermistor
EP0654050A1 (en) * 1992-08-05 1995-05-24 Exxon Chemical Patents Inc. Gas phase polymerization of ethylene and c 7? to c 10? olefins
WO1994007928A1 (en) * 1992-10-02 1994-04-14 The Dow Chemical Company Supported homogeneous catalyst complexes for olefin polymerization
DE69426648D1 (de) * 1993-06-15 2001-03-08 Idemitsu Kosan Co Verfahren zur herstellung von olefinpolymeren und katalysator zur olefinpolymerisation
PT719289E (pt) * 1993-09-17 2000-05-31 Dow Chemical Co Polimerizacao de olefinas em fase gasosa
DE69412576T3 (de) * 1993-12-21 2002-05-29 Univation Technologies,Llc Herstellung von Polyolefinen mit lankettiger Verzweigung nach einem Gasphaseverfahren
ES2256841T3 (es) * 1994-04-07 2006-07-16 Innovene Europe Limited Procedimiento de polimerizacion y poliolefinas obtenidas mediante el mismo.
EP0782589B1 (en) * 1994-09-07 2001-06-20 The Dow Chemical Company Plastic linear low density polyethylene

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