Basell Technology Company B.v.

Basell Polyolefine Gmbh

Jan F Van Baar

Andrew David Horton

Peter A Schut

Gerard M M Van Kessel

Tiziano Dall'Occo

Klaas Lambertus Von Hebel

Johan Stapersma

Maurizio Stefano Galimberti

Eric Kragtwijk

Max Van De Pas

A catalyst system for the polymerization of olefins comprising the product obtained by contacting:

Catalyst system and process for the polymerization of olefins

A process for preparing propylene polymer comprising contacting, under polymerization conditions, propylene and optionally ethylene, with a catalyst system comprising a bridged metallocene and a suitable activating cocatalyst, said process being characteized by reducing the concentration of hydrogen formed during the polymerization reaction.

Propylene polymers and process for the preparation thereof

Catalysts for the polymerization of olefins are disclosed, which comprise the product obtained by contacting: (A) a bridged and/or substituted cyclopentadienyl compound of titanium, zirconium or hafnium; (B) an organometallic aluminium compound of the formula: Al(CH &mdash;CR R &mdash;CR R R ) R H wherein R is a C -C alkyl, alkenyl, or arylalkyl group; R is hydrogen or a C -C alkyl, alkenyl, or arylalkyl group; R and R are C -C alkyl, alkenyl, aryl, arylalkyl or alkylaryl groups; R is hydrogen or a C -C alkyl, alkenyl, aryl, arylalkyl or alkylaryl group; R is a C -C alkyl, alkenyl, or arylalkyl group, a carbon atom in the compound of formula (II) being optionally replaced by a Si or Ge atom; w is 1-3, z is 0 or 1, q&equals;3&minus;w&minus;z, and (C) water; the molar ratio (B)/(C) being comprised between 1:1 and 100:1. These catalysts show an improved activity with respect to known catalysts, wherein different aluminium compounds are used.

Catalysts and processes for the polymerization of olefins

Catalysts for the polymerization of olefins are disclosed, comprising the product obtainable by contacting: (A) a bridged and/or substituted cyclopentadienyl compound of Ti, Zr or Hf; (B) one or more organometallic aluminium compounds of formula (II): AlR H wherein the substituents R , same or different from each other, are linear or branched, saturated or unsaturated C -C alkyl or alkylaryl radicals, optionally containing Si or Ge atoms, wherein at least one of the substituents R is different from a straight alkyl group; z is 0 or 1; and (C) water, the molar ratio between the organometallic aluminium compound and water being comprised between 1:1 and 100:1; said catalyst being obtainable by a process comprising the following steps: (i) contacting component (A) with part of component (B) in the absence of component (C); (ii) contacting part of component (B) with component (C) in the absence of component (A) and successively (iii) contacting the products obtained in steps (i) and (ii).

Catalysts for the polymerization of olefins and process for the preparation thereof

It is disclosed a new catalyst system for the polymerization of olefins comprising the product obtainable by contacting the following components: (A) one or more compounds of a late transition metal belonging to Group 8-11 of the Periodic Table; and (B) the reaction product of water with one or more organometallic aluminum compounds of formula (IV): Al(CH &mdash;CR R R ) R H , wherein R is a C -C alkyl, C -C cycloalkyl or C -C alkylaryl radical; R is different from a straight alkyl and is a C -C alkyl, C -C cycloalkyl, C -C aryl, C -C alkylaryl or C -C arylalkyl radical; or R and R form together a C -C ring; R is hydrogen or a C -C alkyl, C -C aryl, C -C alkylaryl or arylalkyl radical; R is a C -C alkyl, C -C cycloalkyl, C -C aryl, C -C alkylaryl or C -C arylalkyl radical; x is 1-3; z is 0-1; and y is 3&minus;x&minus;z; the molar ratio between said organometallic aluminum compound and water being comprised between 0.5:1 and 100:1.

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Uitgeest, Netherlands

Jan F Van Baar