Equistar Chemicals, LP

Michael H Treptau

Joel A Mutchler

Kiran M Gupte

Harilaos Mavridis

Mark K Reinking

Charles S Holland

Ramesh N Shroff

Keta M Lindstrom

Francis M Mirabella

A disengagement vessel employing a lock hopper effectively reduces concentration of non-polymer-associated components in the polymer product slurry of a first olefin slurry polymerization reactor, allowing cascading of a second slurry polymerization reactor operating at lesser concentration of comonomers, hydrogen, and other components to produce multicompositional polyolefin polymers and/or polymers having a multimodal monomer distribution, e.g. diblock polymers having substantially non-overlapping comonomer contents between the blocks.

Cascaded polyolefin slurry polymerization employing disengagement vessel between reactors

The present invention provides an ethylene copolymer resin that has unique melt elastic properties not observed in ethylene copolymers heretofore known. Specifically, the ethylene copolymer resin of the present invention when in pelletized form has a reduction in melt elasticity (ER) of 10% or more to a final value of 1.0 or less upon rheometric low shear modification or solution dissolution. Moreover, the resin of the present invention when in reactor-made form exhibits at least a partially reversible increase of 10% or more in ER when pelletizing the same. An ethylene polymerization catalyst, a process of preparing the ethylene copolymer resin and a high-impact film are also provided herein.

Enhanced-impact LLDPE with a shear modifiable network structure

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Channahon, IL, United States of America

Michael H Treptau