Basell Polyolefine Gmbh

Montell North America Inc.

Montedison S.p.a.

Basell Poliolefine Italia S.r.l.

E.i. Dupont De Nemours and Company

Himont Incorporated

Basell Poliolefine Italia, S.p.a.

Montell Technology Company Bv

Basell Technology Company B.v.

Giovanni Baruzzi

Giampiero Morini

Luigi Resconi

Tiziano Dall'Occo

Giulio Balbontin

Enrico Albizzati

Luciano Noristi

Antonio Cristofori

Angelo Ferraro

Ofelia Fusco

Colin John Schaverien

Gianni Collina

Maurizio Stefano Galimberti

Simona Guidotti

Umberto Giannini

Ilya Nifant'ev

Mario Sacchetti

Diego Brita

Giuliano Cecchin

Anna Fait

Edward Bryan Coughlin

Pavel V Ivchenko

Pier C Barbe

Lino Credali

Igor Kashulin

Raimondo Scordamaglia

Constantine A Stewart

Luisa Barino

Elisabetta Barbassa

Vincenzo Guidotti

Cristiano Grandini

A multistep process for the polymerization of one or more olefins comprising a first step of polymerizing one or more of said olefins in the presence of a catalyst of the Ziegler-Natta type, a step wherein the polymer obtained in the first step is contacted with a catalyst system comprising an half-sandwich metallocene compound, followed by a second polymerization step. The amount of homo- or copolymer of olefins produced in the first polymerization step is between 10% to 90% by weight of the total amount of polymer produced.

Multistep process for the (co) polymerization of olefins

A process for preparing porous olefin polymers comprising bringing into contact in a polymerization reactor, at a temperature T, one or more olefins of the formula (I) CH&#x2550;CHR, Rbeing hydrogen, a C&#x2013;C-alkyl or a C&#x2013;C-aryl group, with a catalyst obtained by reacting a solid catalyst component in the form of spheroidal particles comprising a compound of Ti or V not containing metal-&#x3c0; bonds and a Mg halide, optionally containing one or more electron donor compounds, with an aluminum-alkyl (Al-alkyl) compound, then raising the temperature up to the polymerization temperature, said process being characterized in that: a) if the temperature Tis lower than 40&#xb0; C., the temperature is raised up to the polymerization temperature is such a way that, for a time of at least one minute after the introduction temperature in such a way that, for a time of at least one minute after the introduction of the catalyst system into the reactor, the temperature of the reaction Tfulfills the following condition of formula (II) wherein m is the time expressed in minutes employed for reaching the temperature T; or b) if temperature Tis 40&#xb0; C. or higher, the reactor is maintained for a time of at least one minute at a temperature of at least 40&#xb0; C.

Process for the preparation of porous polymers and polymers obtainable thereof

Cyclopolyenic 1,3-diethers wherein the carbon atom in position 2 belongs to a particular cyclic or polycyclic structure containing two or three unsaturations, solid catalyst components and catalysts therefrom, the catalysts comprising the reaction product of:

1,3-diethers and components and catalysts for the polymerization of olefins, containing said diethers

A process for the preparation of heterophasic elastomeric polymer comprising the step of polymerizing ethylene, an alpha-olefin CH2&#x2550;CHL, where L is an alkyl, cycloalkyl or aryl radical with 1&#x2013;10 carbon atoms and a non-conjugated diene in the presence of a catalyst system comprising a transition metal catalyst component supported on a porous alpha-olefin polymer, characterized in that at least part of the diene is impregnated on the porous alpha-olefin polymer.

Process for the treatment of polymer compositions

Multi-stage process for the polymerization of olefins CH&#x2550;CHR, where R is hydrogen or a C&#x2013;Calkyl, cycloalkyl or aryl radical, comprising: (I) a first polymerization stage carried out in the presence of a catalyst comprising the product of the reaction between an alkyl-Al compound and a solid component comprising at least one compound of transition metal Mnot containing M-&#x3c0; bonds, thus obtaining a porous polymer, (II) a treatment stage, wherein said porous polymer is contacted with a compound capable of deactivating the catalyst used in stage (I) and with a late transition metal complex; and (III) a second stage of polymerization, carried out in the presence of the product obtained from treatment stage (II).

Multi-stage process for the (CO) polymerization of olefins

A process for producing substantially amorphous propylene (co)polymers, comprising contacting propylene optionally in the presence of one or more olefins under polymerization conditions with a catalyst system comprising: A) a half sandwich titanium complex wherein the cyclopentadienyl is substituted with one or two heterocyclic rings, according to formula (I): cf formula (I) in claim 1: wherein X is N or P; Z is C, Si or Ge; Y is an atom selected from the group consisting of NR , O, PR or S; Y is selected from the group consisting of CR or Y and m is 0 or 1 and B) an activating cocatalyst. The above titanium complex and the ligand useful as intermediates in their synthesis are also described.

Process for producing substantially amorphous propylene-based polymers

Catalyst system for the polymerization of olefins CH &boxH;CHR, wherein R is hydrogen or a hydrocarbon radical having 1-12 carbon atoms, comprising the product of the reaction between (a) a solid catalyst component comprising Mg, Ti, and halogen, (b) dimethylaluminium chloride (DMAC) and (c) an alkylaluinium compound, in which the molar ratio between (b) and (c) is lower than 10. This kind of catalyst system is particularly suitable for the preparation of copolymers of ethylene with &agr;-olefins due to its high capacity for incorporating the comonomer while at the same time maintaining high yields.

Catalyst for the polymerization of olefins

Thermoplastic compositions of isotactic propylene polymers and flexible propylene polymers having reduced isotacticity and a process for the preparation thereof

Multi-stage process for the polymerization of olefins

Process for the preparation of a solid catalyst component for olefins polymerization including (1) a magnesium halide in active form, (2) a titanium compound, and (3) an electron-donor compound selected from particular 1,3-diethers, the process being carried out by reaction between the compounds from (1) to (3), and including at least two additions of electron-donor (3) in the following order:

Process for the preparation of a solid catalyst component suitable for

A process for preparing hyperpure propylene (co)polymers comprising polymerizing the monomer(s) in liquid monomer in the presence of a catalyst obtained by reacting an Al-trialkyl compound with a solid catalyst component comprising magnesium dihalide in active form, having supported thereon a titanium chloride or chloroalcoholate, and an ether having the general formula: ##STR1## where R and R' are the same or different and are C.sub.2-18 alkyl, C.sub.3-18 cycloalkyl, C.sub.6-18 aryl, C.sub.7-18 arylalkyl or alkylaryl radicals.

Hyperpure propylene polymer

Disclosed are catalyst components for the polymerization of olefins which include magnesium halide in active form, and, supported thereon, a titanium halide or titanium halogen alcoholate and an electron-donor compound selected from the group diamines of formula ##STR1## wherein the radicals R.sub.1 to R.sub.10 are the same or different and are hydrogen or C.sub.1 -C.sub.18 hydrocarbon radicals, with the proviso that at least one of the R.sub.7 and R.sub.8 radicals and at least one of the R.sub.9 and R.sub.10 radicals are not hydrogen. Also, disclosed are catalysts obtained from the catalyst components and an Al-alkyl compound, as well as catalysts obtained by reaction of an Al-alkyl compound and a diamine of formula (I) with a solid catalyst component including a titanium halide or a titanium halogen alcoholate, and an electron-donor compound having particular characteristics of extractability with Al-triethyl, supported on magnesium halide in active form.

Components and catalyst for the polymerization of olefins

Disclosed is a component for a catalyst for the polymerization of alpha-olefins to stereoregular polymers having narrow molecular weight distribution. The product is formed by the reaction of a solid catalyst-forming component comprising (1) a Ti compound having at least one Ti-halogen bond and (2) optionally, an electron-donor compound, supported on an anhydrous Mg dihalide in active form, with certain amounts of an organic compound (AH) containing at least one active hydrogen atom, in the presence of a liquid medium which is inert with respect to the Ti compound and the other components of the catalyst component, and which has a dielectric constant greater than 2 at 20.degree. C. Catalysts comprising the reaction product of the solid catalyst component prepared as above described, with an Al-alkyl compound and an electron-donor compound are also disclosed.

Catalyst component and catalyst for the polymerization of alpha-olefins

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Ferrara, Italy

Giovanni Baruzzi