Univation Technologies, LLC

Dow Global Technolgoies LLC

Tae Hoon Kwalk

Mark Gregory Goode

John Francis Szul

Sun-Chueh Kao

Simon Mawson

Kersten Anne Terry

David H McConville

Matthew Gary McKee

Timothy Todd Wenzel

Timothy R Lynn

Robert J Jorgensen

John Henry Oskam

Robert Harold Vogel

Ching-Tai Lue

Dongming Li

Chi-I Kuo

Francis Charles Rix

David James Schreck

Daniel Paul Zilker, Jr

Mark Bradley Davis

Frederick John Karol

Gregory T Whiteker

Rainer Kolb

Jo Ann Marie Canich

Porter Clarke Shannon

Donald R Loveday

Natarajan Anand Muruganandam

Stephen Paul Jaker

Eric Lucas

Jr Daniel P Zilker

A method for making a polyolefin composition according to one embodiment includes altering the concentration of the chain transfer agent present in the reactor to control the HMW and LMW fractions of the polyolefin composition.

Methods for making polyolefins

A catalyst composition that includes a support material having an improved particle-size distribution is provided. Processes for producing polyolefin composition also are provided. Polymers and films also are provided. An example of a catalyst composition is a supported multi-transition-metal catalyst composition that includes: (a) at least two catalyst components selected from the group consisting of: a nonmetallocene catalyst component and a metallocene catalyst component; (b) a support material that has a Dof less than about 30 microns and a particle size distribution having a D/Dratio of less than about 6; and (c) an activator.

Catalyst compositions comprising support materials having an improved particle-size distribution

A process for polymerizing olefin(s) utilizing a cyclic bridged metallocene catalyst system to produce polymers with improved properties is provided. The catalyst system may include a cyclic bridged metallocene, L(R'SiR&#x2032;)LZrQ, activated by an activator, the activator comprising aluminoxane, a modified aluminoxane, or a mixture thereof, and supported by a support, where: Land Lare independently an unsubstituted or a substituted cyclopentadienyl ligand bonded to Zr and defined by the formula (CHR), where R is hydrogen, a hydrocarbyl substituent, a substituted hydrocarbyl substituent, or a heteroatom substituent, and where d is 0, 1, 2, 3 or 4; Land Lare connected to one another with a cyclic silicon bridge, R&#x2032;SiR&#x2032;, where R&#x2032; are independently hydrocarbyl or substituted hydrocarbyl substituents that are connected with each other to form a silacycle ring; and each Q is a labile hydrocarbyl or a substituted hydrocarbyl ligand.

Metallocene catalysts and their use in polymerization processes

Polyethylene compositions having improved properties are provided. In one aspect, a polyethylene composition having a long chain branching index (g') of 0.5 to 0.9; a Melt Flow Rate (MFR) of greater than (49.011&#xd7;MI), where MI is Melt Index; and a weight average molecular weight to number average molecular weight (M/M) of less than or equal to 4.6 is provided.

Polyethylene compositions having improved properties

A bimodal polyethylene composition that includes ethylene-derived units, and, optionally, one or more other olefin-derived units, wherein the bimodal polyethylene composition possesses a density of at least 0.940 g/cc, an average molecular weight (Mw) of from 200,000 to 370,000, a z-average molecular weight (Mz) of from 1,500,000 to 3,400,000 Daltons, and a z+1 average molecular weight (Mz+1) of from 2,500,000 to 6,800,000 Daltons, is provided in various embodiments. Articles made therefrom and methods of making the same are also provided.

Bimodal polyethylene compositions for blow molding applications

Catalyst compositions and methods, useful in polymerization processes, utilizing at least two metal compounds are disclosed. At least one of the metal compounds is a Group 15 containing metal compound and the other metal compound is preferably a bulky ligand metallocene-type catalyst. The invention also discloses a new polyolefin, generally polyethylene, particularly a multimodal polymer and more specifically, a bimodal polymer, and its use in various end-use applications such as film, molding and pipe.

Catalyst composition, method of polymerization, and polymer therefrom

Disclosed are various compositions, including but not limited to a high density multimodal polyethylene composition, that has a density of 0.935 g/cc or more, and that includes a blend of a first polyethylene component and a second polyethylene component, in which: the first polyethylene component includes a bimodal polyethylene; and the second polyethylene component includes a unimodal polyethylene that is made from a polymerization conducted in the presence of a metallocene having two cyclopentadienyl rings.

Polyethylene compositions having improved tear properties

Disclosed herein are various processes, including a process for producing a film, comprising (including) forming a film from a blended polyolefin composition at a line speed of at least 170 feet per minute, wherein the blended polyolefin composition comprises: (a) a bimodal polyethylene component that includes a high molecular weight polyethylene component having a high average molecular weight (MW) and a low molecular weight polyethylene component having a low average molecular weight (MW), wherein the ratio of the high average molecular weight to the low average molecular weight (MW:MW) is 20 or more wherein the high and low molecular weight polyethylene components of the bimodal polyethylene component are formed in a single reactor; and (b) a unimodal polyethylene component that occupies more than 15 wt % of the composition.

Polyethylene blend compositions

Disclosed herein are various compositions, including a high density polyethylene composition, comprising: (a) a bimodal polyethylene component that includes a high molecular weight polyethylene component having a high average molecular weight (MW) and a low molecular weight polyethylene component having a low average molecular weight (MW), wherein the ratio of the high average molecular weight to the low average molecular weight (MW:MW) is 20 or more; and (b) a unimodal polyethylene component that occupies more than 15 wt % of the composition; wherein: (c) the composition has a density of 0.935 g/cc or more, and a Maximum Line Speed of 170 feet per minute or more.

Disclosed are various compositions, including but not limited to a high strength bimodal polyethylene composition having a density of 0.940 g/cc or more, the composition comprising a high molecular weight polyethylene component having a higher weight average molecular weight (Mw) and a low molecular weight polyethylene component having a lower weight average molecular weight (Mw), wherein: the ratio of the higher weight average molecular weight to the lower weight average molecular weight (Mw:Mw) is 30 or more; and the composition qualifies as a PE 100 material such that in accordance with ISO 1167 a pipe formed from the composition that is subjected to internal pipe resistance has an extrapolated stress of 10 MPa or more when the internal pipe resistance curve is extrapolated to 50 or 100 years in accordance with ISO 9080:2003(E).

High strength biomodal polyethylene compositions

The invention provides for polymerization catalyst compositions, and for methods for introducing the catalyst compositions into a polymerization reactor. More particularly, the method combines a catalyst component containing slurry and a catalyst component containing solution to form the completed catalyst composition for introduction into the polymerization reactor. The invention is also directed to methods of preparing the catalyst component slurry, the catalyst component solution and the catalyst compositions, to methods of controlling the properties of polymer products utilizing the catalyst compositions, and to polymers produced therefrom.

Bimodal polyolefin

Polymerization process

This invention relates to a process to polymerize olefin(s) comprising combining a solution, slurry or solid comprising one or more bulky ligand metallocene catalyst compounds, an optional support, and or one or more activator(s) with a solution comprising one or more phenoxide catalyst compounds, and thereafter, introducing one or more olefin(s) and the combination into a polymerization reactor. This invention also relates to a polymer of ethylene wherein the polymer has a density of 0.910 to 0.930 g/cc, a melt index of 0.3 to 2.0 dg/min, and a 15 to 35 &#x3bc;m thick film of the polymer has a 45&#xb0; gloss of 60 or more, a haze of 7% or less, and a dart impact of 600 g or more.

Catalyst composition, method of polymerization and polymer therefrom

A low density substantially linear polyethylene composition is described, including some that have: (a) a density of 0.935 g/cc or less; (b) a Haze of 10% or less, (c) a Dart Impact of 100 grams/mil or more, (d) an average overall long chain branching index of 0.95 or more; and (e) a slice long chain branching (SLCB) index of 0.85 or less for any portion of the composition having a molecular weight of 100,000 or above.

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Belle Mead, NJ, United States of America

Tae Hoon Kwalk