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Colin Li Pi Shan, Lonnie G Hazlitt, Yunwa Wilson Cheung, Benjamin C Poon, Phillip D Hustad, Roger L Kuhlman, Edmund M Carnahan, XiaoHua Qiu, Angela N Taha: Propylene/α-olefins block interpolymers. Dow Global Technologies, Whyte Hirschboeck Dudek SC, September 25, 2012: US08273838 (27 worldwide citation)

Embodiments of the invention provide a class of propylene/α-olefin block interpolymers. The propylene/α-olefin interpolymers are characterized by an average block index, ABI, which is greater than zero and up to about 1.0 and a molecular weight distribution, Mw/Mn, greater than about 1.3. Preferably ...


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Max P McDaniel, Uriah Kilgore, Qing Yang, Kathy S Collins: Methods for producing fluorided-chlorided silica-coated alumina activator-supports and catalyst systems containing the same. Chevron Phillips Chemical Company, Merchant & Gould, May 5, 2015: US09023959 (13 worldwide citation)

Methods for the preparation of fluorided-chlorided silica-coated alumina activator-supports are disclosed. These activator-supports can be used in catalyst systems for the production of olefin-based polymers, such as polyethylene and polypropylene.


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Mark L Hlavinka, Errun Ding, Paul DesLauriers, Yongwoo Inn, Lili Cui, Qing Yang, Ashish Sukhadia, Guylaine St Jean, Richard M Buck: Higher density polyolefins with improved stress crack resistance. Chevron Phillips Chemical Company, Merchant & Gould P C, October 13, 2015: US09156970 (10 worldwide citation)

Disclosed herein are polymerization processes for the production of olefin polymers. These polymerization processes can employ a catalyst system containing two or three metallocene components, resulting in ethylene-based copolymers that can have a medium density and improved stress crack resistance.


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Matthew W Holtcamp, Laughlin G McCullough, Celestino M Perez Jr, Sarah J Mattler: Reverse staged impact copolymers. ExxonMobil Chemical Patents, Priya G Prasad, June 28, 2016: US09376559 (9 worldwide citation)

This invention relates to processes to prepare impact copolymers having an ethylene content of greater than 20 wt % using a process where ethylene polymer is made in the first stage and propylene polymer is made in the second stage.


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KOL Moshe, PRESS Konstantin: COMPLEXES MÉTALLIQUES DE LIGANDS DE TYPE SALAN ET LEURS UTILISATIONS COMME CATALYSEURS POUR LA POLYMÉRISATION DALPHA-OLÉFINES, METAL COMPLEXES OF SALAN-TYPE LIGANDS AND USES THEREOF AS CATALYSTS FOR POLYMERIZATION OF ALPHA-OLEFINS. RAMOT AT TEL AVIV UNIVERSITY, KOL Moshe, PRESS Konstantin, G E EHRLICH, July 26, 2012: WO/2012/098521 (9 worldwide citation)

Use of homogeneous catalytic systems which include as a pre-catalyst a complex of a group 4 metal and a Salan ligand in the polymerization of alpha-olefins, is disclosed. The Salan ligand is characterized by a sequential diamino-containing skeleton unit which is non-symmetric, and the pre-catalysts ...


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Kristin Reichelt, Luigi Resconi, Juha Paavilainen: Sealing propylene copolymer. Borealis, Tarolli Sundheim Covell & Tummino, January 26, 2016: US09243137 (8 worldwide citation)

Propylene copolymer composition comprising a propylene copolymer (A) having a comonomer content in the range of equal or more than 0.5 to equal or below 2.0 wt.-%, the comonomers are C5 to C12 α-olefins, and a propylene copolymer (B) having a comonomer content in the range of equal or more than 4.0 ...


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Max P McDaniel, Qing Yang, Tony R Crain: Processes for preparing metallocene-based catalyst systems. Chevron Phillips Chemical Company, Merchant & Gould, October 20, 2015: US09163098 (8 worldwide citation)

Methods for preparing single and dual metallocene catalyst systems containing an activator-support are disclosed. These methods can include precontacting of the activator-support and an organoaluminum compound, as well as sequential contacting of two different metallocene compounds to form a dual me ...


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KLOSIN Jerzy, THOMAS Pulikkottil J, FROESE Robert D, CUI Xiuhua: Procédé pour polymériser sélectivement léthylène et catalyseur pour celui-ci, Process for selectively polymerizing ethylene and catalyst therefor. Dow Global Technologies, KLOSIN Jerzy, THOMAS Pulikkottil J, FROESE Robert D, CUI Xiuhua, PURCHASE Claude F, November 24, 2011: WO/2011/146044 (8 worldwide citation)

The present invention generally relates to a process that selectively polymerizes ethylene in the presence of an alpha-olefin, and to a metal-ligand complex (precatalyst) and catalyst useful in such processes, and to related compositions. The present invention also generally relates to ligands and i ...


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Munehito Funaya, Atsushi Sakuma, Ikuko Ebisawa, Shinsuke Kinoshita, Akiko Matsumoto, Hirokazu Tanaka, Shinya Tanaka: Process for producing olefin polymer and olefin polymer. Mitsui Chemicals, Rankin Hill & Clark, October 4, 2016: US09458257 (7 worldwide citation)

There is provided a process for producing an olefin polymer that is capable of producing an olefin polymer having high heat resistance and high molecular weight with excellent catalytic activity. The process for producing an olefin polymer includes a step of polymerizing at least one olefin selected ...