Chevron Phillips Chemical Company LP

Phillips Petroleum Company

Chevron Philips Chemical Company, LP

Chung Ching Tso

Qing R Yang

Ashish M Sukhadia

Errun Ding

Max P McDaniel

Youlu Yu

Yongwoo Inn

John T Blagg

Guylaine St Jean

Daniel G Hert

Paul J DesLauriers

Randall S Muninger

Jeremy M Praetorius

Albert P Masino

Randy S Muninger

Richard M Buck

Qing Yang

Max P Mcdaniel

Joel L Martin

Mark L Hlavinka

David C Rohlfing

Christopher E Wittner

Deloris R Gagan

Melvin Hildebrand

Aaron M Osborn

Tony R Crain

Carlos A Cruz

Jared L Barr

Jeffrey S Fodor

Jerry T Lanier

Lloyd W Guatney

Brandy Rutledge-Ryal

Paul J Deslauriers

Jeff S Fodor

William J Fisher

Kelly Frey

Bill Bridendolph

Sarah Eppinger

Robert L Wynn

Bruce E Kreischer

Ronald D Knudsen

Vivek Rohatgi

Elizabeth Mary Lanier

Mark E Lashier

Mark J Lamborn

Alan E Miller

Brent A Fiedler

Joe W Ryker

R Kim Perry

Guylaine STJEAN

Randall Muninger

Disclosed herein are ethylene-based polymers generally characterized by a melt index of less than 15 g/10 min, a density from 0.91 to 0.945 g/cm, a CY-a parameter at 190° C. from 0.2 to 0.6, an average number of long chain branches per 1,000,000 total carbon atoms of the polymer in a molecular weight range of 500,000 to 2,000,000 g/mol of less than 5, and a maximum ratio of η/3η at an extensional rate of 0.03 secin a range from 3 to 15. The ethylene polymers have substantially no long chain branching in the high molecular weight fraction of the polymer, but instead have significant long chain branching in the lower molecular weight fraction, such that polymer melt strength and bubble stability are maintained for the fabrication of blown films and other articles of manufacture. These ethylene polymers can be produced using a dual catalyst system containing a single atom bridged metallocene compound with an indenyl group and a cyclopentadienyl group, and an unbridged hafnium metallocene compound with two cyclopentadienyl groups.

Dual catalyst system for producing LLDPE and MDPE copolymers with long chain branching for film applications

Disclosed are ethylene polymer compositions containing a homogeneously-branched first ethylene polymer component and 15-35 wt. % of a homogeneously-branched second ethylene polymer component of higher density than the first ethylene polymer component. The ethylene polymer composition can be characterized by a density from 0.912 to 0.925 g/cm, a ratio of Mw/Mn from 2 to 5, a melt index less than 2 g/10 min, and a CY-a parameter at 190&#xb0; C. from 0.35 to 0.7. These polymer compositions have the excellent dart impact strength and optical properties of a metallocene-catalyzed LLDPE, but with improved machine direction tear resistance, and can be used in blown film and other end-use applications. Further, methods for improving film Elmendorf tear strength also are described.

Dual component LLDPE copolymers with improved impact and tear resistance, and methods of their preparation

This disclosure provides methods of predicting the steady state small scale critical temperatures (S4 T) of polymer resins and pipes therefrom.

Processes for predicting small scale steady state (S4) critical temperatures

Disclosed are ethylene polymer compositions containing a homogeneously-branched first ethylene polymer component and a homogeneously-branched second ethylene polymer component of higher density than the first ethylene polymer component. The ethylene polymer composition can be characterized by a density from 0.912 to 0.925 g/cm, a melt index less than 3.5 g/10 min, and a CY-a parameter at 190&#xb0; C. from 0.25 to 0.65. These polymer compositions have the excellent dart impact strength and optical properties of a metallocene-catalyzed LLDPE, but with improved machine direction tear resistance, and can be used in blown film and other end-use applications.

Dual component LLDPE copolymers with improved impact and tear resistance

Disclosed herein are ethylene-based polymers generally characterized by a melt index of less than 15 g/10 min, a density from 0.91 to 0.945 g/cm, a CY-a parameter at 190&#xb0; C. from 0.2 to 0.6, an average number of long chain branches per 1,000,000 total carbon atoms of the polymer in a molecular weight range of 500,000 to 2,000,000 g/mol of less than 5, and a maximum ratio of &#x3b7;/3&#x3b7; at an extensional rate of 0.03 secin a range from 3 to 15. The ethylene polymers have substantially no long chain branching in the high molecular weight fraction of the polymer, but instead have significant long chain branching in the lower molecular weight fraction, such that polymer melt strength and bubble stability are maintained for the fabrication of blown films and other articles of manufacture. These ethylene polymers can be produced using a dual catalyst system containing a single atom bridged metallocene compound with an indenyl group and a cyclopentadienyl group, and an unbridged hafnium metallocene compound with two cyclopentadienyl groups.

Ethylene polymers having a density from 0.908 to 0.925 g/cm, a melt index from 0.5 to 3 g/10 min, a ratio of Mw/Mn from 2 to 4, a ratio of Mz/Mw from 1.6 to 2.3, a CY-a parameter from 0.45 to 0.6, and an ATREF profile characterized by a single peak at a peak ATREF temperature from 76 to 88&#xb0; C., and by less than 4.5 wt. % of the polymer eluting above a temperature of 91&#xb0; C. These ethylene polymers can be used to produce various articles of manufacture, such as blown and cast films with a beneficial combination of high tear resistance and low haze.

Metallocene catalyst system for producing LLDPE copolymers with tear resistance and low haze

Disclosed herein are ethylene-based polymers generally characterized by a Mw ranging from 70,000 to 200,000 g/mol, a ratio of Mz/Mw ranging from 1.8 to 20, an IB parameter ranging from 0.92 to 1.05, and an ATREF profile characterized by one large peak. These polymers have the dart impact, tear strength, and optical properties of a metallocene-catalyzed LLDPE, but with improved processability, melt strength, and bubble stability, and can be used in blown film and other end-use applications.

Dual catalyst system for producing LLDPE copolymers with a narrow molecular weight distribution and improved processability

Catalyst systems having both a metallocene catalyst component and a Ziegler-Natta component are disclosed. Such catalyst systems can contain a metallocene compound, an activator-support, an organoaluminum compound, and a Ziegler-Natta component comprising titanium supported on magnesium chloride.

Ziegler-Natta&#x2014;metallocene dual catalyst systems with activator-supports

Disclosed herein are ethylene-based polymers produced using dual metallocene catalyst systems. These polymers have low densities, high molecular weights, and broad molecular weight distributions, as well as having the majority of the long chain branches in the lower molecular weight component of the polymer, and the majority of the short chain branches in the higher molecular weight component of the polymer. Films produced from these polymers have improved impact and puncture resistance.

Low density polyolefin resins with low molecular weight and high molecular weight components, and films made therefrom

Disclosed herein are ethylene-based polymers generally characterized by a density from 0.89 to 0.93 g/cm, a ratio of Mw/Mn from 3 to 6.5, a Mz from 200,000 to 650,000 g/mol, a CY-a parameter at 190&#xb0; C. from 0.2 to 0.4, and a reverse short chain branching distribution. The ATREF profile of these polymers can have a high temperature peak from 92 to 102&#xb0; C., and a low temperature peak from 18 to 36&#xb0; C. less than that of the high temperature peak. These polymers can have comparable physical properties to that of a metallocene-catalyzed LLDPE, but with improved processability, shear thinning, and melt strength, and can be used in blown film and other end-use applications.

Dual catalyst system for producing LLDPE copolymers with improved processability

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Bartlesville, OK, United States of America

Chung Ching Tso