Univation Technologies, LLC

Dow Global Technolgoies LLC

Daudi A Abe

Ayush A Bafna

Bo Liu

Roger L Kuhlman

Timothy R Lynn

Brandon C Locklear

Joel D Wieliczko

John Francis Szul

Chuan C He

Yuet Meng Chu

Simon J White

T R Veariel

Tr Veariel

TR Veariel

A method of increasing bubble stability of a needful high molecular weight bimodal high-density polyethylene resin in need thereof, the method comprising subjecting the needful high molecular weight bimodal high-density polyethylene resin to a determined amount of oxygen tailoring of the resin so as to independently increase both the resin's melt storage modulus G' (at G″=3000 pascals) and complex viscosity ratio SH1000, and thereby make an oxygen-tailored high molecular weight bimodal high-density polyethylene resin having a targeted increase in bubble stability. The method uses a tailoring effective amount of molecular oxygen (O) to achieve the desired oxygen tailoring. The method uses these advanced rheological properties from dynamic mechanical spectroscopy, but analyzes the data in a different way that is more sensitive to changes in resin composition and properties, and yet achieves a resin regime having a targeted increase in bubble stability.

Method of increasing bubble stability of a polyethylene resin

A bimodal ethylene-co-1-hexene copolymer consisting essentially of a higher molecular weight component and a lower molecular weight component and, when in melted form at 190 degrees Celsius, is characterized by a unique melt property space defined by a combination of high-load melt index, melt flow ratio, and melt elasticity properties. A blown film consisting essentially of the bimodal ethylene-co-1-hexene copolymer. A method of synthesizing the bimodal ethylene-co-1-hexene copolymer. A method of making the blown film. A manufactured article comprising the bimodal ethylene-co-1-hexene copolymer.

Bimodal polyethylene copolymer and film thereof

A bimodal ethylene-co-1-butene copolymer consisting essentially of a higher molecular weight component and a lower molecular weight component and, when in melted form at 190 degrees Celsius, is characterized by a unique melt property space defined by a combination of high-load melt index, melt flow ratio, and melt elasticity properties. A (blown) film consisting essentially of the bimodal ethylene-co-1-butene copolymer and having improved properties. Methods of synthesizing the bimodal ethylene-co-1-butene copolymer and making the blown film. A manufactured article comprising the bimodal ethylene-co-1-butene copolymer.

Methods for extrusion of polyolefins () that control specific energy input to the extruder () for gel reduction. Disclosed herein is an example method for forming plastic products () with reduced gels, comprising: melting a polyolefin resin () in extruder () to form a melt; adjusting specific energy input in the extruder () to reduce gels in the melt; and forming the melt into a polyolefin product (). Disclosed herein is also an example method for forming plastic products () with reduced gels, comprising: melting a polyolefin resin in extruder () to form a melt; selecting a throttle valve () position for gel reduction; setting the throttle valve () at the selected throttle valve () position to restrict flow of the melt out of the extruder (); and forming the melt into a polyolefin product ().

Methods for gel reduction in polyolefins

Methods for extrusion of polyolefins () that utilize melt temperature to control molecular weight and also reduce gels. Disclosed herein is an example method for controlling polymer chain scission in an extrusion system (), comprising: melting a polyolefin resin () in extruder () at a first melt temperature to form a first melt (); passing the first melt () through a screen pack (); forming the first melt) into a first polyolefin product (); melting additional polyolefin resin () of the same grade in the extruder () at a second melt temperature to form a second melt (), wherein the second melt temperature differs from the first melt temperature by 5&#xb0; C. or more to control chain scission in the extruder (); passing the second melt () through the screen pack (); and forming the second melt () into a second polyolefin product ().

Methods for controlling polymer chain scission

Systems () and methods for making different plastic products () in a single melting process are provided. A method includes melting a plastic resin in a first extruder () to form a melt () and transferring at least a portion of the melt to a second extruder (). Any portion of the melt () that is not transferred to the second extruder () is formed into a first plastic product (). Additives () are blended with the melt in the second extruder to form a second melt (), and a second plastic product () is formed from the second melt ().

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Freeport, TX, United States of America

Daudi A Abe