Other

Academy of Applied Science

University of Massachusetts

Solvay (societe Anonyme)

Solvay Polyolefins Europe-belgium (societe Anonyme)

Solvay Polyolefins Europe-belgium

Marvin D Rausch

James C Chien

Serge Bettonville

Emma J Thomas

Laughlin G McCullough

James C W Chien

Juan Carlos Flores

Fabian Siberdt

Didier Grandfils

Juan C Flores

Novel silylene or ethylene bis(tetrahydrofluorenyl)metallocenes are synthesized and used as olefin polymerization catalysts.

Tetrahydrofluorenyl containing group 4 metallocenes useful as catalysts for the polymerization of olefins, process for their preparation and use of said metallocenes for the polymerization of olefins

Asymmetric silicon-bridged metallocenes useful as catalysts in the polymerization of &agr;-olefins, process for their preparation and use of said metallocenes for the polymerization of &agr;-olefins

Disclosed is a monocyclopentadienyl metal compound that can polymerize polyolefins as part of a catalyst system. The monocyclopentadienyl compound can specifically be (C,H,CH,CH,NMe,)TiCl,.

Monocyclopentadienyl transition metal catalyst and olefin polymerization process

Disclosed are a thermoplastic elastomeric polypropylene (and other olefin homopolymerized polymers) made using a metallocene catalyst and a single olefin monomer, and a method of preparing the same to produce a chain of alternating stereo regular crystallizable segments and stereo-irregular non-crystallizable polymerized segments, the former acting as physical crosslinks between tee non-crystallizable segments to form a thermoplastic elastomeric material having good elastomeric properties.

Elastomeric polypropylene and other polyolefin elastomers, metallocene catalyst and method of ion preparation

Novel asymmetric ethylene-bridged metallocenes useful as catalysts in the polymerization of olefins and process for preparing said metallocenes. The novel metallocenes are represented by the general formula: ##STR1## wherein M represents a transition metal selected from titanium, zirconium and hafnium and X and X' represent a halogen atom. Preferably, the transition metal is Zr and the halogen atoms are both chlorine. Process for producing the novel metallocenes of general formula (I) comprising the steps of:

Asymmetric ethylene-bridged metallocenes useful as catalysts in the

Disclosed is a monocyclopentadienyl metal compound that can polymerize polyolefins as part of a catalyst system. The monocyclopentadienyl compound can specifically be (C.sub.5 H.sub.4 CH.sub.2 CH.sub.2 NMe.sub.2)TiCl.sub.3.

Monocyclopentadienyl transition metal catalyst and olefin polymerization

A thermoplastic elastomeric polypropylene (and other olefin homopolymerized polymers) using a novel catalyst with a single monomer olefin, and method of preparing the same to produce a chain of alternating stereo regular crystallizable segments and stereo-irregular non-crystallizable polymerized segments, the former acting as physical crosslinks between the non-crystallizable segments to form a thermoplastic elastomeric material having good elastomeric properties.

Polypropylene and other olefin polymer thermoplastic elastomers, novel

A process for the preparation of a polyolefin by polymerization of at least one olefin, the said process comprising contacting the at least one olefin with a catalytic system comprising a metallocene and a cocatalyst, wherein the metallocene is selected from the group consisting of rac-2,2-dimethylpropylidene(1-.eta..sup.5 -cyclopentadienyl)(1-,.eta..sup.5 -fluorenyl)dichlorometallocene of titanium, zirconium, hafnium and vanadium. Syndiotactic polypropylene having a melting temperature T.sub.m from 95.degree. to 160.degree. C., a syndiotactic pentad fraction [rrrr] from 0,91 to 0,96, a crystalline fraction f.sub.C from 25 to 50% and a viscosity-average molecular weight M.sub.v from 60,000 to 200,000.

Process for the preparation of a polyolefin and syndiotactic

Amidinate Group 4 metal complexes wherein the metal is in the +2, +3 or +4 formal oxidation state and activating cocatalysts or activating techniques are used to produce catalysts useful for polymerizing olefins. In particular, vinylaromatic monomers are polymerized to form highly syndiotactic polymers.

Growing community of inventors

Amherst, MA, United States of America

Marvin D Rausch