The Dow Chemical Company

Dow Global Technolgoies LLC

Bp Chemicals Limited

Dupont Dow Elastomers Inc.

Larry Duane Cady

Deepak R Parikh

Michael K Laughner

Morgan Mark Hughes

Larry Alan Meiske

Teresa Plumley Karjala

David R Wilson

Brad A Cobler

Osborne K McKinney

Lee Spencer

Ian M Munro

Philip Howard

William R Van Volkenburgh

Kevin P Peil

Christopher James Frye

Deepak Rasiklal Parikh

Peter S Williams

J Mark Winter

S Roy Partington

Peter J Maddox

Lisa E Dodson

Michael Kenneth Laughner

Shear-thinning ethylene/&#x3b1;-olefin and ethylene/&#x3b1;-olefin/diene monomer interpolymers that do not include a traditional branch-inducing monomer such as norbornadiene are prepared at an elevated temperature in an atmosphere that has little or no hydrogen using a constrained geometry complex catalyst and an activating cocatalyst.

Shear thinning ethylene/&#x3b1;-olefin interpolymers and their preparation

Shear-thinning ethylene/&agr;-olefin and ethylene/&agr;-olefin/diene monomer interpolymers that do not include a traditional branch-inducing monomer such as norbornadiene are prepared at an elevated temperature in an atmosphere that has little or no hydrogen using a constrained geometry complex catalyst and an activating cocatalyst.

Shear thinning ethylene/&agr;-olefin interpolymers and their preparation

The invention relates to a polyolefin copolymer composition produced with a catalyst having a metallocene, complex in a single reactor for the polymer of an &agr;-olefin monomer with one or more olefin comonomers, and a molecule weight maximum which occurs in that 50 percent by weight of the composition which has the highest weight percent comonomer content. Preferably, the composition has a comonomer partitioning fact C which is equal to or greater than 1.10 or molecule weight partitioning fact M which is equal to or greater than 1.15. Preferred composition also have at least 0.01 long chain branches per 1000 carbon atoms along the polymer backbone. These compositions with reverse molecular engineering have. superior properties and are easily processable due to the simultaneous presence of the association of high molecular weight with high comonomer content and of long chain branching.

Polyolefin composition with molecular weight maximum occurring in that part of the composition that has the highest comonomer content

Medium modulus, polyethylene films and bags with improved tear performance are made for heavy-duty packaging applications and hot-fill uses. Film compositions contain high molecular weight linear polyethylene and linear ethylene/.alpha.-olefin interpolymer. The film is at least about 1.25 mils (31 microns) thick and is characterized as having a calculated film density in the range of about 0.923 to about 0.95 grams/cubic centimeter (g/cc) and typically has a tear strength or impact resistance at least 30 percent greater than current industrial polyethylene film. The novel film has superior dimensional stability and strength properties which allow significant down-gauging relative to industrial films used as heavy-duty overwraps, sleeves and bags.

Medium modulus polyethylene film and fabrication method

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Houston, TX, United States of America

Larry Duane Cady