Chevron Phillips Chemical Company LP

John T Blagg

Chung Ching Tso

Ashish M Sukhadia

Yongwoo Inn

Qing R Yang

Jeremy M Praetorius

Max P McDaniel

Errun Ding

Randall S Muninger

Sarah Eppinger

Elizabeth Mary Lanier

Mark J Lamborn

Brent A Fiedler

Alan E Miller

Qing Yang

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

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

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Nowata, OK, United States of America

John T Blagg