Abstract: A description follows of random butadiene-isoprene copolymers with a trans-1,4 structure, having a butadiene/isoprene molar composition ranging from 98/2 to 32/68, the above copolymers being crystalline or amorphous depending on the isoprene content. The process for the preparation of the above copolymers is also described, in the present of a catalytic system which comprises: (a) a first component consisting of a vanadium compound selected from: (a1) compounds having general formula (Ia) VO(L)n(X)m wherein n is an integer from 1 to 3 and m ranges from zero to 2, n+m being equal to 2 or 3; (a2) compounds having general formula (Ib) V(L)p(X)q wherein p is an integer from 1 to 4, q ranges from zero to 3, the sum of p+q being equal to 3 or 4; wherein L is a bidentate ligand and X is a halogen, preferably Chlorine; (b) a second component selected from aluminoxanes and relative derivatives.

Abstract: The present invention relates to a supported catalyst containing titanium, its preparation and it use in the homo-, co-, and ter-polymerization of olefin-unsaturated compounds. The present invention also relates to a catalytic system comprising a supported catalyst based on titanium and a co-catalyst selected from organo-derivatives of aluminum. More, specifically, the present invention relates to catalyst supported on silica, obtained by reacting a titanium halocarboxylate and a magnesium halocarboxylate with an aluminum chloroakylderivative, in the presente of a carrier consisting of high porosity silica. The above reaction essentially takes place in the pores of the silica itself.

Abstract: A description follows of random butadiene-isoprene copolymers with a trans-1,4 structure, having a butadiene/isoprene molar composition ranging from 98/2 to 32/68, the above copolymers being crystalline or amorphous depending on the isoprene content. The process for the preparation of the above copolymers is also described, in the present of a catalytic system which comprises: (a) a first component consisting of a vanadium compound selected from: (a1) compounds having general formula (Ia) VO(L)n(X)m wherein n is an integer from 1 to 3 and m ranges from zero to 2, n+m being equal to 2 or 3; (a2) compounds having general formula (Ib) V(L)p(X)q wherein p is an integer from 1 to 4, q ranges from zero to 3, the sum of p+q being equal to 3 or 4; wherein L is a bidentate ligand and X is a halogen, preferably Chlorine; (b) a second component selected from aluminoxanes and rclativc dcrivativcs.

Abstract: Process for the selective oligomerization of ethylene to give ?-olefins essentially consisting of C4 to C8, characterized in that it is carried out in the presence of a catalytic system comprising the complex having general formula (II): (L)M(Y)n wherein L represents the ligand having general formula (I) M represents a transition metal; Y is selected from groups of an anionic nature bound to the metal as anion in ionic couple or with a covalent bond of the “?” type.

Abstract: The present invention relates to tridentate ligands and the relative complexes of these ligands with transition metals. The ligands and their complexes are useful in the oligomerization and/or polymerization of ethylene and ?-olefins. The ligands are represented by formula (I) wherein R1 is ethyl, R2, R3, R4, R5 and R6, are independently selected from the group consisting of hydrogen, halogen, C1-C10 alkyl, C6-C15 aryl, and halogenated C6-C15 aryl; R7 is selected from the group consisting of H, C1-C10 alkyl, and C6-C15 aryl; and R8 is selected from the group consisting of phenyl, alkyl substituted phenyl, C1-C10 alkyl and C6-C15 aryl.

Abstract: Titanium complex having general formula (I) (RCOO)nTiXp wherein R is a monofunctional hydrocarbyl radical having from 1 to 20 carbon atoms and a number of halogen atoms, selected from fluorine, chlorine and bromine, preferably chlorine, ranging from 1 to 6; X is chlorine, bromine or a beta-dicarbonyl group such as acetylacetone (AcAc), formylacetone, benzoylacetone, dibenzoylmethane; p+n=2, 3, 4, preferably p+n=3; n is greater than or equal to 1. The preparation of the above complex and its use in the co- and ter-polymerization of ?-olefins, are also described.

Abstract: A metallocene compound of a metal M of group 4 in the table of elements, comprising a cyclopentadienyl group and at least one oligomeric group R′ bonded to M, having the following formula (II): -(AxDyUz)RI  (II) wherein: A represents any monomeric unit deriving from a vinylaromatic group polymerizable by means of anionic polymerization, having from 6 to 20 carbon atoms; D represents any monomeric unit deriving from a conjugated diolefin polymerizable by means of anionic polymerization, having from 4 to 20 carbon atoms; U represents any generic optional monomeric unit deriving from an unsaturated compound copolymerizable with any of the above conjugated diolefins D or vinylaromatic compounds A; RI represents hydrogen or a hydrocarbyl group having from 1 to 20 carbon atoms, each index “x” and “y” can be independently zero or an integer, provided the sum (x+y) is equal to or higher than 2, preferably between 2 and 50, more preferably between 2 and 25; “z

Abstract: Catalytic composition for the (co)polymerization of ethylene and other &agr;-olefins, including a metallocene complex of a metal M of group 4 of the periodic table or the product obtainable from the same combined with a suitable activator, wherein said metallocene complex includes at least one cyclopentadienyl group and at least one unsaturated hydrocarbyl organic group bonded to the metal M, having the following formula (I): -(AxDyUz)RI  (I) wherein: A represents any monomeric unit deriving from a vinylaromatic group polymerizable by means of anionic polymerization, having from 6 to 20 carbon atoms; D represents any monomeric unit deriving from a conjugated diolefin polymerizable by means of anionic polymerization, having from 4 to 20 carbon atoms; U represents any generic optional monomeric unit deriving from an unsaturated compound co-polymerizable with any of the above conjugated diolefins D or vinylaromatic compounds A; RI represents hydrogen or a hydrocarbyl group having from 1 to 20 car

Abstract: A process is described for the hydrogenation of olefin double bonds present in polymers and copolymers of conjugated dienes, which comprises putting the above polymer or copolymer of conjugated dienes in contact with hydrogen in an inert solvent, in the presence of a catalytic system, characterized in that the above catalytic system essentially consists of one or more titanium compounds selected from those having general formula (I) wherein: M is selected from Ti(III) and Ti(IV) and their mixtures.

Abstract: An organometallic composition which can be used as activating component in a metallocene catalyst for the (co)polymerization of &agr;-olefins, comprises: (A) a fluorinated di-unsaturated cyclic compound, having a relatively acid hydrogen atom, (B) an organometallic compound sufficiently basic to react with the acid hydrogen of the above compound (A), and (C) a polar aprotic organic compound, not containing metallic atoms, having a dielectric constant, in the pure state, equal to or greater than 2, and a weak coordinating capacity. Said composition allows a metallocene catalytic system of the ionic type to be obtained, with a high activity in the (co)polymerization of olefins and a reduced content of metallic residue in the polymeric product thus obtained.

Abstract: Organometallic complex having the formula (IAP)M(X)n which can be used for die formation of catalytic systems wherein: M is a metal selected from transition metals and lanthanides, in oxidation state “s” positive and different from zero; each X is independently a group of an anionic nature bound to the metal as an anion in an ionic couple or with a convalent bond of the “&sgr;” type; “n” expresses the number of X groups sufficient for neutralizing the formal “+s” charge of the metal M, and (IAP) represents a neutral bond consisting of a mono-imine of 2,6-diacylpyridine. Said complex is prepared with relatively simple methods and can be used, combined with a suitable co-catalyst, such as for example, an aluminoxane, as a catalyst in normal (co)polymerization processes of &agr;-olefins, and especially ethylene.

Abstract: Titanium complex having general formula (1) (RCOO)nTiXp wherein R is a monofunctional hydrocarbyl radical having from 1 to 20 carbon atoms and a number of halogen atoms, selected from fluorine, chlorine and bromine, preferably chlorine, ranging from 1 to 6; X is chlorine, bromine or a beta-dicarbonyl group such as acetylacetone (AcAc), formylacetone, benzoylacetone, dibenzoylmethane; p+n=2, 3, 4, preferably p+n=3; n is greater than or equal to 1. The preparation of the above complex and its use in the co- and ter-polymerization of &agr;-olefins, are also described.

Abstract: A process is described for the hydrogenation of olefin double bonds present in polymers and copolymers of conjugated dienes, which comprises putting the above polymer or copolymer of conjugated dienes in contact with hydrogen in an inert solvent, in the presence of a catalytic system, characterized in that the above catalytic system essentially consists of one or more titanium compounds selected from those having general formula (I) 1

Abstract: Catalytic composition for the (co)polymerization of ethylene and other &agr;-olefins, including a metallocene complex of a metal M of group 4 of the periodic table or the product obtainable from the same combined with a suitable activator, wherein said metallocene complex includes at least one cyclopentadienyl group and at least one unsaturated hydrocarbyl organic group bonded to the metal M, having the following formula (I):

Abstract: A metallocene compound of a metal M of group 4 in the table of elements, comprising a cyclopentadienyl group and at least one oligomeric group R′ bonded to M, having the following formula (II):

Abstract: A description follows of ligands having general formula (I) wherein R1, R2, R3, R4, R5, and R6, the same or different, are selected form hydrogen, halogen, C1-C10 alkyl, C6-C15 aryl optionally halogenated, or adjacent pairs of Ri groups (with i ranging from 1 to 6) are bound to each other to give cyclic hydrocarbon structures condensed with the thiophene or pyridine ring: R7 is selected from H, C1-C10 alkyl, C6-C15 aryl: R8 is selected from C1-C10 alkyl and C6-C15 aryl. The complexes of the above ligands with transition metals are also described.

Abstract: Complex catalysts based on a metal of group VIII complexed with suitable ligands, particularly active in the homopolymerization of ethylene and in its copolymerization with another unsaturated monomer of the vinylic and acrylic type.

Abstract: Allyl polyalkylcyclopentadienyl complex of a metal of group 4 of the periodic table, and its use in the preparation of a catalytic composition for the (co) polymerization of &agr;-olefins. said complex is advantageously stable in solution and rapidly forms catalytic compositions with a high activity without the necessity of effecting alkylating pretreatment.

Abstract: Process for the selective oligomerization of ethylene to give &agr;-olefins essentially consisting of C4 to C8, character in that it is carried out in the presence of a catalytic system comprising the complex having general formula (II): (L)M(Y)n wherein L represents the ligand having general formula (I) M represents a transition metal; Y is selected from groups of an anionic nature bound to the metal as anion in ionic couple or with a covalent bond of the “&sgr;” type.

Abstract: An organometallic composition of a reaction product of a fluorinated organic compound of formula (I): wherein R1 to R8 are as described in the specification, m is 0 or 1; and an organometallic compound of formula (II): M′RnX(p−n)  (II) wherein M′, R, X, n and p are as described in the specification; a polymerization catalyst composition using the above organometallic composition and a metallocene complex a method of making the catalyst composition and using the catalyst composition to polymerize &agr;-olefins.