Solvay (societe Anonyme)

Solvay Polyolefins Europe-belgium

Solvay Polyolefins Europe-belgium (societe Anonyme)

Solvay Sa

Greenerity Gmbh

Nicola Zandona

Fabian Siberdt

John J Eisch

Yun Qian

Jurgen Weber

Eric Pierre Dubois

Olivier Lhost

Jens-Peter Suchsland

Hugo Jan Baptist Vandenborre

Matthias Binder

Hugo Jan Vandenborre

Bipolar electrode () for use in an electrolysis unit, said bipolar electrode () comprising a planar main body having a first side and a second side, each of said first side and said second side being provided with a corresponding pattern of protrusions (), wherein each of said protrusions has a geometrical base within the plane of said planar main body and a substantially planar top side (), the orthogonal projection of said top side onto said main body being contained in said geometrical base, and wherein the top sides () of the respective protrusions () of said first side and said second side lie in two planes parallel to said planar main body, the electrode being further characterized by specific shape and orientation requirements. Method for producing the bipolar electrode as above described, which includes an embossing step.

Bipolar electrode and method for producing same

Process for the polymerization of olefins using a catalytic system comprising a solid precursor containing at least one neutral halogenated metallocene derived from a transition metal and at least one ionizing agent, and an organometallic compound derived from a metal chosen from groups IA, IIA, IIB, IIIA, and IVA of the Periodic Table.

Catalytic system comprising a solid precursor and process for the polymerization of olefins

A metallocene corresponding to the formula

Metallocenes and process for the preparation of metallocenes

A metallocene corresponding to the formula ##STR1## wherein M is a group 4 transition metal, each Y is, independently, selected from the group of halogen, hydrocarbyl and hydrocarbyloxy,

A catalytic solid for (co)polymerization of ethylene, includes (a) at least one inorganic support; (b) at least one transition metal metallocene having a formula (C.sub.p).sub.a (C.sub.p ').sub.h MX.sub.x Z.sub.z, in which C.sub.p and C.sub.p each denote a cyclopentadienyl, indenyl, or fluorenyl radical or a substituted derivative of such a radical, coordinated to the central atom M, optionally the groups C.sub.p and C.sub.p are linked via a covalent bridge, M denotes the at lease one transition metal, which is selected from the group consisting of scandium, titanium, zirconium, hafnium and vanadium, a, b, x and z denote integers such that (a+b+x+z)=m, x&gt;0, z.gtoreq.0 and a and/or b.noteq.0, m denotes the valency of the at least one transition metal M, X denotes a halogen, and Z denotes a hydrocarbon radical which may optionally comprise oxygen or a silyl radical of formula (--R.sub.1 --Si--R'R'R'') where R denotes an alkyl, alkenyl, aryl, alkoxy or cycloalkyl group comprising up to 20 carbon atoms, R', R', R'' are identical or different and each denote a halogen or an alkyl, alkenyl, aryl, alkoxy or cycloalkyl group comprising up to 20 carbon atoms, and t denotes 0 or 1; (c) at least one ionizing agent selected from the group consisting of triphenylcarbenium tetrakis(pentafluorophenyl)borate, N,N-dimethylanilinium tetrakis (pentafluorophenyl)borate, tri(n-butyl)ammonium tetrakis(pentafluorophenyl)borate, lithium tetrakis(pentafluorophenyl)borate, tris(pentafluorophenyl)boron, triphenylboron, trimethylboron, tris(trimethylsilyl)borate and organoboroxines, and (d) at least one chromium compound which is selected from the group consisting of chromium oxides, chromium acetate, chromium chloride, chromium sulfate, chromates, dichromates and chromium acetylacetonate, and which is present in a molar ratio of chromium/transition metal M ranging from 0.001 to 100.

Catalytic solid for the (co)polymerization of ethylene, process for its

(Co)polymerisation process according to which a mixture of a halogenated neutral metallocene as defined above and of an organoaluminium compound is prepared, the olefin is brought into contact with this mixture and an ionising agent is added thereto.

Process for the preparation of a catalytic system, process for the (CO)

Solid precursor of a catalytic system for the polymerization of olefins, containing at least one neutral halogenated metallocene derived from a transition metal, the latter being linked to at least one halogen atom, and at least one ionizing agent. Process for the preparation of this solid precursor, according to which a compound based on the neutral halogenated metallocene is mixed with a compound based on the ionizing agent in a heterogeneous medium. Catalytic system comprising an organometallic compound derived from a metal chosen from groups IA, IIA, IIB, IIIA and IVA of the Periodic Table, and a solid precursor described above. Process for the polymerization of olefins, in which this catalytic system is used.

Solid precursor of a catalytic system for the polymerization of olefins,

Catalyst system comprising an ionic metallocene derived from a transition metal, a catalytic solid containing an element of group IVB, magnesium and a halogen, and an aluminium derivative. Process for preparing this catalyst system, according to which a mixture of a neutral metallocene and of the catalytic solid is prepared, the mixture thus obtained is placed in contact with an aluminium derivative and an ionizing agent is added to it. Process for (co)polymerization of an olefin, according to which a mixture of the neutral metallocene and of the catalytic solid is prepared, the mixture thus obtained is placed in contact with an aluminium derivative and the olefin, and the ionizing agent is added to it.

Catalyst system, use of this catalyst system for the (co)polymerization

Catalytic solid for the (co)polymerisation of at least one olefin, comprising a coprecipitate of magnesium and of at least one transition metal, obtained by means of a process comprising the preparation of a mixture of a magnesium compound, such as the chloride or a magnesium alcoholate, and of a compound denoted by one of the formulae MY.sub.x (O--R').sub.t-x and M'O.sub.y (O--R').sub.s-2y and the treatment of the resulting mixture with a complex of formula M'(A)Al.sub.2 (X',X').sub.8 where X' and X' denote halogens, M and M' transition metals of groups IVB and VB, M' a transition metal of group IVB, A an aromatic hydrocarbon, Y a halogen or a group (O--R''), and R', R' and R'' an alkyl, aryl or cycloalkyl group.

Process for the manufacture of a catalytic solid, catalytic solid and

Process for the preparation of a catalytic system according to which a mixture of a halogenated neutral metallocene derived from a transition metal chosen from groups IIIB, IVB, VB and VIB of the Periodic Table and of an organoaluminium compound is prepared and an ionising agent is added thereto. (Co)polymerization process according to which a mixture of a halogenated neutral metallocene as defined above and of an organoaluminium compound is prepared, the olefin is brought into contact with this mixture and an ionising agent is added thereto.

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Waterloo, Belgium

Nicola Zandona