Exxonmobil Chemical Patents Inc.

Exxon Chemical Patents, Inc.

Carlos U DeGracia

Peijun Jiang

Jo Ann M Canich

Mun Fu Tse

Ian C Stewart

Charles James Ruff

Eric John Markel

Beverly Jean Poole

Daniel L Bilbao

Armen H Dekmezian

This invention relates to methods to prepare and compositions pertaining to branched ethylene-propylene copolymers that include at least 50% ethylene content by weight as determined by FTIR; a g'of less than 0.95; a Mof 125,000 to 300,000; a methylene sequence length of 6 or greater as determined byC NMR, wherein the percentage of sequences of the length of 6 or greater is more than 32%; and can have greater than 50% vinyl chain end functionality.

Ethylene-propylene copolymeric compositions with long methylene sequence lengths

The invention is a polyethylene composition having a polydispersity index of less than or equal to 3, an average branching index (g') as measured by GPC/Vis.gtoreq.0.9, and a melt strength (MS) (centiNewton, 190.degree. C.) that satisfies the relationship: ##EQU1## In a preferred embodiment these polyethylene compositions comprise A) branched polyethylene copolymers prepared by insertion polymerization of ethylene, ethylene-containing macromers, and optionally, additional copolymerizable monomers, and B) essentially linear ethylene copolymers. Improved melt strength without sacrificing the benefits of narrow polydispersity index are exhibited by the invention compositions.

High melt strength polyethylene compositions

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LaPorte, TX, United States of America

Carlos U DeGracia