Exxon Chemical Patents, Inc.

Other

Jo Ann Canich

Howard W Turner

Natalie Ann Merrill

Gary F Licciardi

Patrick Brant

Kevin Richard Squire

Gregory G Hlatky

Donna Jean Crowther

Timothy Daniel Shaffer

Henry W Yang

George Alan Vaughan

Richard Allen Fisher

Anthony Nicholas Speca

Richard B Pannell

Armenag Hagop Dekmezian

Bruce Alan Harrington

Phillip Thomas Matsunaga

Rinaldo Soria Schiffino

Charles James Ruff

David Edward Gindelberger

Bernard J Folie

Rolf Bodo Temme

Gregory G Hlatkey

Patrick Brandt

Described are certain monocyclopentadienyl Group IV B metal compounds, catalyst systems comprising such monocyclopentadienyl metal compounds and an activator, and a process using such catalyst systems for the production of polyolefins, particularly high molecular weight ethylene-.alpha.-olefin copolymers having a high level of .alpha.-olefin incorporation.

Monocyclopentadienyl metal compounds for

The invention encompasses late transition metal catalyst systems and their use in polymerization processes, particularly in solution, 2-phase suspension and super-critical phase polymerization of ethylene-containing polymers. Preferred embodiments include the use of a late transition metal catalyst system comprising a Group 8, 9, 10, or 11 metal complex stabilized by a bidentate ligand structure for polymerization under elevated ethylene pressure, or concentration, conditions.

Elevated pressure polymerization processes with late transition metal

The present invention relates to a gas phase process for the polymerization of monomer(s) utilizing a metallocene catalyst system to produce easy processing polyolefin polymers.

Polymerization process

Substantially random ethylene copolymers containing at least 3.0 mole percent of geminally disubstituted olefin monomers are described. The geminally disubstituted olefin monomers can be represented by the generic formula R.sub.1 =R.sub.2 (R.sub.3)(R.sub.4), where R.sub.1 is CH.sub.2, R.sub.2 is C, and R.sub.3 and R.sub.4 are, independently, essentially linear hydrocarbyl groups having from 1 to 30 carbon atoms, or more, and containing one carbon atom bound directly to R.sub.2. The copolymers can be prepared by coordination polymerization by means of contacting at least one geminally disubstituted olefin monomer and ethylene, optionally with one or more other coordination polymerizable monomers, with a catalyst system comprising a monocyclopentadienyl, heteroatom-containing Group 4 transition metal catalyst component.

Copolymers of ethylene and germinally disubstituted olefins

This invention is generally directed toward a supported catalyst system useful for polymerizing olefins. The method for supporting the catalyst system of the invention provides for a supported bulky ligand transition metal catalyst system which when utilized in a polymerization process substantially reduces the reactor fouling and sheeting particularly in a gas phase polymerization process.

Polymerization catalyst systems, their production and use

High molecular weight copolymers of ethylene and 0.5-10 mole percent branched a-olefins are disclosed. The polymers have M.sub.w of 30,000-1,000,000, MWD of 2-4, a density of 0.85-0.95 g/cm.sup.3, and a high composition distribution breadth index. Also disclosed are a method for making the polymers with a cyclopentadienyl metallocene catalyst system, and films, fibers, molded articles and other products made from the copolymers.

Ethylene/branched olefin copolymers

Copolymers of ethylene and geminally disubstituted olefins

An amorphous polypropylene having a high weight average molecular weight prepared by a process in the presence of a catalyst comprising titanium-containing monocyclopentadienyl metallocene and aluminoxane.

Higher molecular weight amorphous polypropylene

Cycloolefin/alpha-olefin copolymers in a molar ratio from 5/95 to 95/5, optionally including long linear alpha-olefin, branched alpha-olefins and/or polyenes as additional comonomers, are prepared using a cyclopentadienyl metallocene catalyst system based on a transition metal compound from Group 4 of the Periodic Table of Elements. The copolymers have a high molecular weight, a narrow molecular weight distribution and a substantially uniform, random comonomer distribution.

Method for preparing alpha-olefin/cycloolefin copolymers

The invention is a catalyst system including a monocyclopentadienyl titanium compound and an alumoxane component which is highly productive for polymerizing ethylene and .alpha.-olefins to produce a high molecular weight ethylene-.alpha.-olefin copolymer having a high content of .alpha.-olefin.

Monocyclopentadienyl titanium metal compounds for

Described are certain mono(cyclopentadienyl) Group IV B metal compounds, catalyst systems comprising such mono(cyclopentadienyl) metal compounds and an activator, and to a process using such catalyst systems for the production of polyolefins, particularly ethylene-.alpha.-olefin copolymers having a high molecular weight and high level of .alpha.-olefin incorporation.

This invention comprises a catalyst system and a process using such catalyst system for the production of high molecular weight polyolefins, particularly polyethylene and higher poly-.alpha.-olefin, and copolymers of ethylene and/or .alpha.-olefins with other unsaturated monomers, including diolefins, acetylenically unsaturated monomers and cyclic olefins. The catalyst system comprises three components, a monocyclopentadienyl Group IV B transition metal compound, an alumoxane, and a modifier. The catalyst system is highly active, at low ratios of aluminum to the Group IV B transition metal, hence catalyzes the production of a polyolefin product containing low levels of catalyst metal residue.

Modified monocyclopentadienyl transition metal/alumoxane catalyst system

This invention relates to polypropylene blends, particularly blends of high molecular weight amorphous polypropylene with low molecular weight isotactic polypropylene. These blends exhibit unusual elastomeric properties.

Thermoplastic elastomers

This invention relates to polypropylene blends, particularly blends of high molecular weight amorphous polypropylene with lower molecular weight isotactic polypropylene. These blends exhibit unusual elastomeric properties.

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Webster, TX, United States of America

Jo Ann Canich