Abstract: A process for preparing at least one alicyclic carboxylic acid compound by Grignard reaction, the process comprising: reacting magnesium and at least one alicyclic halide compound in at least one solvent to produce at least one alicyclic Grignard reagent; concurrently adding carbon dioxide to the magnesium, the alicyclic halide compound, the solvent, and the alicyclic Grignard reagent, while the alicyclic Grignard reagent is still being produced, to form at least one alicyclic carboxylate magnesium salt; and hydrolyzing the alicyclic carboxylate magnesium salt to form the alicyclic carboxylic acid compound; wherein the alicyclic Grignard reagent and the alicyclic carboxylate magnesium salt are prepared in a one-pot synthesis.

Abstract: A bridged metallocene compound of formula (I) wherein: M is an atom of a transition metal; X, is a hydrogen atom, a halogen atom, or a hydrocarbon-based group; R1 is a C1-C40 hydrocarbon radical; R2 and R3, form together a condensed 3-7 membered ring; R4 is a hydrogen atom or a C1-C40 hydrocarbon radical; W is an aromatic 5 or 6 membered ring.

Abstract: A process for preparing crystalline ethylene (co)polymers comprising (co)polymerizing ethylene in the presence of carried out in the presence catalyst system comprising (a) a solid catalyst component comprising Ti, Mg, halogen, ORI groups, where RI is a C1-C12 hydrocarbon group optionally containing heteroatoms, having ORI/Ti molar ratio of at least 0.5, an amount of titanium, with respect to the total weight of said solid catalyst component, higher than 4% by weight, and showing a specific pattern of the SS-NMR; and (b) an aluminum alkyl compound as a cocatalyst. The process allows to obtain in good yields ethylene polymers with narrow MWD.

Abstract: A propylene polymer composition comprising (weight percentages being referred to the sum of A+B): (A) 75-95% by weight of a copolymer of propylene comprising from 0.5 to 3.0 mole % of comonomer units derived from ethylene and/or C4-C8 alpha-olefins; and (B) 5-25% by weight of a copolymer of propylene comprising from 25 to 45 mole % of ethylene units, said propylene polymer composition having a melt flow rate value according to ISO 1133 (230° C., 2.16 Kg) of from 20 to 40 g/10 min.

Abstract: The present invention relates to a process for preparing propylene polymer compositions in at least two-stage process wherein, in a first stage, a propylene homopolymer or a propylene copolymer comprising propylene and at least a CZ-CIO-1-alkenes other than propylene, containing at least 85% by weight of propylene, is prepared by polymerization and, in a second stage, ethylene and at least a comonomer selected from propylene and C4-C,o1alkenes are polymerized to give an ethylene polymer, comprising at least 90% by weight of ethylene, wherein the amount of the ethylene polymer in the propylene polymer composition ranges from 10 to 50% by weight and the propylene polymer composition has a melt flow rate MFR, in accordance with ISO 1133 at 230° C. and 2.16 kg, of from 2 to 50 g/10 min.

Abstract: A bridged metallocene compound of formula (I) wherein: M is a transition metal; X, is a hydrogen atom, a halogen atom, or a hydrocarbon group optionally containing hetematoms; L is a divalent bridging group; R1 is a linear C1C40 hydrocarbon radical optionally containing hetexoatonis; T1, T2, T3 and T4 are an oxygen or sulfur atom or a C(R18)2 group with the proviso that at least one group between T1 and T2 is an oxygen or a sulfur atom; wherein R18, are hydrogen atoms or a C1-C4O hydrocarbon radical; n is 1, 2 or 3; R4 is a hydrogen atom or a C1-C40 hydro carbon radical; W is an aromatic 5 or 6 membered ring.

Abstract: A process for preparing supported, titanized chromium catalysts is disclosed. The process comprises A) bringing a support material into contact with a protic medium comprising a titanium compound and a chromium compound; B) optionally removing the solvent; C) optionally calcining the precatalyst obtained after step B); and D) optionally activating the precatalyst obtained after step B) or C) in an oxygen-containing atmosphere at from 400° C. to 1100° C.

Abstract: Cyclopentadienyl complexes of group 6 having at least one cyclopentadienyl system which is substituted by at least one silyl group which bears at least one halogen substituent and a catalyst system comprising at least one of the cyclopentadienyl complexes, and also a process for preparing them, the use of the catalyst system for the polymerization or copolymerization of olefins and a process for preparing polyolefins by polymerization or copolymerization of olefins in the presence of the catalyst system.

Abstract: Multilayer polypropylene films comprising a base layer A, at least one skin layer B adhered to said base layer A and a metal layer M deposited on the surface of said skin layer, wherein said skin layer B comprises a propylene copolymer containing from 3% to 6% by weight of C4-C10 alpha-olefin units, said propylene copolymer having a xylene soluble fraction at 23° C. of less than 4.0 wt %, a VICAT softening temperature higher than 135° C. and an indentation value according to the VICAT test method lower than or equal to 0.05 mm at 120° C.

Abstract: Process for the preparation of a solid catalyst component for the polymerization of olefins, the process comprising the steps of: —continuously contacting solid particles of a MgCl2.mROH adduct, wherein 0.5<m<6.0 and R is an alkyl, cicloalkyl or aryl radical having 1-12 carbon atoms, with a liquid phase comprising one or more compounds capable of reacting with the —OH groups of said adduct to obtain a slurry containing a MgCl2.nROH, wherein n is lower than m; —reacting the slurry from step a) with one or more titanium compounds of formula Ti(OR)pXq?p, wherein q=3-4 and p=0-q, X is an halogen and R is an alkyl, cicloalkyl or aryl radical having 1-18 carbon atoms.

Abstract: Monocyclopentadienyl complexes in which the cyclopentadienyl system bears at least one bridged keto, thioketo, imino or phosphino group, a catalyst system comprising at least one of the monocyclopentadienyl complexes and a process for preparing polyolefins by polymerization or copolymerization of olefins in the presence of the catalyst system.

Abstract: An olefin polymer composition comprising (by weight, unless otherwise specified): A) 60-85% of a crystalline propylene homopolymer or a crystalline copolymer of propylene containing 3% or less of ethylene or C4-C10 ?-olefin(s) or of combinations thereof, said homopolymer or copolymer having a Polydispersity Index (P.I.) value of from 4.5-6 and a content of isotactic pentads (mmmm), measured by 13C NMR on the fraction insoluble in xylene at 25° C., higher than 96%; B) 15-40% of a partially amorphous copolymer of ethylene containing from 35% to 70% of propylene or C4-C10 ?-olefin(s) or of combinations thereof, and optionally minor proportions of a diene. The said olefin polymer composition exhibits a value of elongation at break ranging from 150 to 600% according to ISO method 527.

Abstract: Propylene polymers having a content of isotactic pentads (mmmm) higher than 97%, molecular weight distribution, expressed by the formula (a) ratio, equal to or higher than 6 and a value of formula (b) ratio equal to or lower than 5.5. The said polymers are prepared in the presence of a particular combination of Ziegler-Natta solid catalyst components and highly stereoregulating electron-donor compounds. Laminated articles, in particular bi-axially oriented films and sheets, can be prepared with the said polymers.

Abstract: Polyolefin compositions comprising, by weight: A) 30-80% of a polyolefin component containing not less than 80% of a waste material selected from polyethylene, polypropylene or their mixtures; B) 20-70% of a heterophasic polyolefin composition having flexural modulus equal to or lower than 600 MPa.

Abstract: For the (co) polymerization of ethylene with other 1-olefins, a Ziegler catalyst which comprises the product from the reaction of a magnesium alkoxide suspended or dispersed as ge in an inert solvent with a tetravalent transition metal compound and is subjected to a thermal after-treatment for a period of not more than 180 minutes is prepared. The catalyst gives a high yield of a polymer powder which has a broad molar mass distribution and is best suited to the production of films, hollow bodies and pipes.

Abstract: The present invention relates to catalyst systems for preparing isotactic polyolefins which are obtained by reacting at least one chiral coordination compound of a main group element selected from the group of elements consisting of Al, Si, P, S, Ga, Ge, As, Se, In, Sn, Sb, Te, TI, Pb, Bi and Po as central atom and at least one cocatalyst which is able to convert the chiral coordination compound into a species which displays polymerization activity toward at least one olefin, with the chiral coordination compound comprising two bidentate chelating ligands joined to one another via a bridge and, optionally, one or two further monodentate ligands and with the four coordinating atoms of the two chelating ligands surrounding the main group element as central atom of the coordination compound in an approximately planar fashion and up to two further ligands being located above and below this approximately planar coordination sphere formed by the four coordinating atoms of the two chelating ligands and, in the case

Abstract: The present invention relates to a propylene copolymer composition comprising A) a propylene copolymer containing from 1 to 20% by weight of olefins other than propylene and B) at least one propylene copolymer containing from 5 to 98% by weight of olefins other than propylene, where the propylene copolymer composition is obtainable by means of a two-stage or multistage polymerization using a catalyst system based on metallocene compounds which is used in both stages.

Abstract: A masterbatch composition comprising (percent by weight): A) 15%-50% of a polypropylene component having a melt flow rate of from 1 to 250 g/10 min.; and B) 50%-85% of an olefin polymer partially soluble in xylene at room temperature, containing from 60% to 85% by weight of ethylene; said masterbatch composition having (i) a value of the intrinsic viscosity [?] of the fraction soluble in xylene at room temperature ([?]sol) equal to or lower than 2.9 dl/g, and (ii) a value of the ratio MFR/[?], , , , equal to or lower than 4, is added to polyolefin materials to obtain final compositions suitable for injection molding.

Abstract: Polyolefin compositions comprising (percent by weight): 1) 55-80% of a crystalline propylene homopolymer or copolymer containing up to 15% of ethylene and/or C4-C10 ?-olefin(s) and having an MFR value of at least 15 g/10 min, and 2) 2) 20-45 wt % of a copolymer of ethylene with one or more C4-C10 ?-olefin(s) containing from 10 to 4 wt % of said C4-C10 ?-olefin(s). The said compositions have values of MFR equal to or higher than 15 g/10 min, a total content of ethylene of 20% or more, a total content of C4-C10 ?-olefin(s) of 4.5% or more, a ratio of the total content of ethylene to the total content of C4-C10 ?-olefin(s) of 2.3 or more, and an intrinsic viscosity value of the fraction soluble in xylene at room temperature of 1.7 dl/g or less.

Abstract: A polyolefin composition comprising (percentage by weight): (A) from 60 to 85% of a broad molecular weight distribution propylene polymer (component A) having a polydispersity index from 5 to 15 and melt flow rate of from 20 to 78 g/10 min (according to ASTM-D 1238, condition L); and (B) from 15 to 40% of a partially xylene-soluble olefin polymer rubber (component B) containing at least 65% by weight of ethylene. Said composition finds application in automotive field.