E.i. Dupont De Nemours and Company

The University of North Carolina at Chapel Hill

Other

E.i. Du Pont De Nmeours and Company

Lin Wang

Lynda Kaye Johnson

Steven Dale Ittel

Elizabeth Forrester McCord

Ying Wang

Joel David Citron

Zhen-Yu Yang

Alex Sergey Ionkin

Zhibin Guan

Peter Arnold Morken

Paul Joseph Fagan

Alison Margaret Anne Bennett

George Yanwu Li

Samuel David Arthur

Maurice S Brookhart

Edward Bryan Coughlin

Elisabeth Muriel Hauptman

Jerald Feldman

Stephan James McLain

Yueli Wang

William Howard Tuminello

Kristina Ann Kreutzer

Anju Parthasarathy

Patricia Metzger Cotts

Catherine E Radzewich

Neville Everton Drysdale

Christopher Moore Killian

Mark Gerrit Roelofs

Rinaldo Soria Schiffino

Paul Raphael Resnick

Maria Spinu

Christopher Marc Doyle

Keith Joseph Kunitsky

Susan Kuharcik Choi

Robert D Simpson

Weijun Liu

Jon M Malinoski

Kerwin D Dobbs

Alison Margaret Bennett

Karl Jeffrey Sweetman

Karl Jeffery Sweetman

Stephan J Mclain

Zhen Yu Yang

Elisabeth M Hauptman

Ethylene and allyl- or vinylsilanes are efficiently copolymerized by certain late transition metal complexes containing selected bidentate or tridentate ligands. The resulting novel polymers may be crosslinked by moisture when vinylsilane contains groups bound to silicon which are hydrolyzable. The polymers are useful for wire coating, crosslinked foams, pipes, and other uses.

Copolymers of vinyl- and allylsilanes

Transition metal complexes of selected monoanionic phosphine ligands, which also contain a selected Group 15 or 16 (IUPAC) element and which are coordinated to a Group 3 to 11 (IUPAC) transition metal or a lanthanide metal, are polymerization catalysts for the (co)polymerization of olefins such as ethylene and &#x3b1;-olefins, and the copolymerization of such olefins with polar group-containing olefins. These and other nickel complexes of neutral and monoanionic bidentate ligands copolymerize ethylene and polar comonomers, especially acrylates, at relatively high ethylene pressures and surprisingly high temperatures, and give good incorporation of the polar comonomers and good polymer productivity. These copolymers are often unique structures, which are described.

Catalysts for olefin polymerization

Mixtures of different polyolefins may be made by direct, preferably simultaneous, polymerization of one or more polymerizable olefins using two or more transition metal containing active polymerization catalyst systems, at least one of which contains cobalt or iron complexed with selected ligands. The polyolefin products may have polymers that vary in molecular weight, molecular weight distribution, crystallinity, or other factors, and are useful as molding resins and for films.

Polymerization of olefins

Catalysts for the polymerization of olefins are provided. The catalysts comprise: 

Mixed polymerization catalyst component for polymerizing olefins

Olefins are polymerized by novel transition metal complexes of selected iminocarboxylate and iminoamido ligands, sometimes in the presence of cocatalysts such as alkylaluminum compounds or neutral Lewis acids. Olefins which may be (co)polymerized include ethylene, &#x3b1;-olefins, and olefins containing polar groups such as olefinic esters for example acrylate esters. Also described are certain 'Zwitterionic' transition metal complexes as polymerization catalysts for making polar copolymers. The resulting polymers are useful as thermoplastics and elastomers.

Copolymers of olefins and vinyl- and allylsilanes

This invention concerns olefins having a terminally disposed fluorocyclobutyl ring bearing an ionic functionality or a precursor thereto, a process for the production thereof, and polymers formed therefrom.

Polymers, containing a fluorocyclobutyl ring and their preparation

Certain complexes containing ligands having a phosphino group, amino group or an imino group, and a second functional group such as amide, ester or ketone, when complexed to transition metals, catalyze the (co)polymerization of olefinic compounds such as ethylene, &#x3b1;-olefins and/or acrylates. A newly recognized class of ligands for making copolymer containing polar monomers using late transition metal complexes is described.

Polymerization of olefinic compounds

Blends of two or more polyethylenes are made by reacting ethylene with an oligomerization catalyst that forms &#x3b1;-olefins, and two polymerization catalysts, one of which under the process conditions copolymerizes ethylene and &#x3b1;-olefins, and the other of which under process conditions does not readily copolymerize ethylene and &#x3b1;-olefins. The blends may have improved physical properties and/or processing characteristics.

Manufacture of polyethylenes

Novel reactions used to prepare phosphole and bisphosphole compounds are detailed. Novel phosphole compounds and metal coordination compounds of phosphole and bisphosphole compounds are also provided. These metal coordination compounds are useful as catalysts for the polymerization or olefins with carbon monoxide and for the polymerization of acrylic monomers.

Phosphole and diphosphole ligands for catalysis

Phosphole and dishosphole ligands for catalysis

Certain complexes containing ligands having a phosphino group, amino group or an imino group, and a second functional group such as amide, ester or ketone, when complexed to transition metals, catalyze the (co)polymerization of olefinic compounds such as ethylene, &agr;-olefins and/or acrylates. A newly recognized class of ligands for making copolymer containing polar monomers using late transition metal complexes is described.

Olefins containing selected functional groups such as silyl, ether and alkenyl, and often containing a blocking group, may be copolymerized with unsubstituted olefins such as ethylene and propylene in the presence of certain coordination compounds of nickel or palladium. The resulting polymers are useful as molding resins, elastomers, in adhesives and for films.

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Hockessin, DE, United States of America

Lin Wang