Abstract: The invention concerns an organic composition comprising glycerol polycarbonates, mixed with polyglycerols, [(a-hydroxymethyl)oxyethylene/(a-hydroxymethyl ethylene carbonate) copolymers; optionally [(a-alkyl)oxyethylene/(a-alkyl) ethylene carbonate] copolymers, optionally [(a-alkyl)oxyethylene/(a-hydroxyalkyl)oxyethylene] copolymers, glycerol carbonate and/or other organic carbonates, glycerol and/or other co-produced and/or residual compounds and a method for producing said composition. The inventive composition or the homopolymers and copolymers constituting same, are applicable in the technical fields of hydraulic fluids, lubrication, wood treatment and decoration, fire-retardant treatment, detergency, oil prospecting and production, water treatment, cosmetics, pharmaceutics, food industry and chemical intermediates.

Abstract: The invention concerns polyesters of at least one of polyhydroxylated compounds at least partly acylated, belonging the group consisting of polyhydroxylated compounds constituted by glycerol polycarbonates, specific polyglycerols, [(a-hydroxymethyl) oxyethylene/(a-hydroxymethyl) ethylene carbonate] copolymers, [(a-hydroxymethyl) oxyethylene/(a-hydroxymethyl) ethylene carbonate] copolymers, [(a-alkyl) oxyethylene/(a-hydroxyalkyl) oxyethylene] copolymers. The invention also concerns a method for acylating at least partly one of said polyhydroxylated compounds. The invention is applicable to the technical fields relating to engine and industrial lubricants, greases, hydraulic fluids, metal deformation and processing lubricants, stripping and mold dressing products, oil prospecting, mines, tunnel borers, cosmetics, detergency, inks, textile coatings and papers, to the field of food products, to the protection of wood as synthesis intermediates.

Abstract: The present invention discloses the use of a chromium-based catalyst system in two serially connected loop reactors for copolymerising ethylene and a comonomer, at reduced productivity, the final polyethylene having a reduced amount of gel.

Abstract: A homogeneous blend of a low density polyethylene with a metallocene-catalysed polyethylene having a density of from 0.906 g/cm3 and a Dow Rheology Index of at least 5/MI2,MI2 being the melt index measured according to ASTMD-1238 condition 190° C./2.16 kg and the Dow Rheology Index being determined by a dynamic rheological analysis performed at 190°.

Abstract: A process for producing bimodal polyethylene resins in two reactors in series, the process comprising producing a first polyethylene resin fraction in a first slurry loop reactor in a diluent in the presence of a catalyst and producing a second polyethylene resin fraction in a second slurry loop reactor, serially connected to the first reactor, in the diluent in the presence of the catalyst, the first polyethylene resin fraction being passed from the first reactor to the second reactor together with the catalyst, one of the first and second reactors producing a resin fraction of higher molecular than the resin fraction produced by the other of the first and second reactors, characterised in that the first reactor is fed with a feed of ethylene and diluent having an ethylene content of at least 70 wt % based on the weight of the diluent and in that in the first reactor the slurry of polyethylene in the diluent has a solids content of at least 30 wt % based on the weight of the dilent.

Abstract: A process for producing bimodal polyethylene resins in two reactors in series, the process comprising producing a first polyethylene resin fraction in a first slurry loop reactor in a diluent in the presence of a catalyst and producing a second polyethylene resin fraction in a second slurry loop reactor, serially connected to the first reactor, in the diluent in the presence of the catalyst, the first polyethylene resin fraction being passed from the first reactor to the second reactor together with the catalyst, one of the first and second reactors producing a resin fraction of higher molecular than the resin fraction produced by the other of the first and second reactors, characterised in that the first reactor is fed with a feed of ethylene and diluent having an ethylene content of at least 70 wt % based on the weight of the diluent and in that in the first reactor the slurry of polyethylene in the diluent has a solids content of at least 30 wt % based on the weight of the diluent.

Abstract: The present invention relates to an apparatus and process for polymerizing olefins. One embodiment comprises polymerizing at least one monomer in a first loop reactor in the presence of a catalyst to produce a first polyolefin fraction. A portion of the first polyolefin fraction is transferred to a second loop reactor, connected in series with the first loop reactor. The process further comprises polymerizing in the second loop reactor at least one monomer in the presence of a catalyst to produce a second polyolefin fraction in addition to the first polyolefin fraction. The combination of the first and second polyolefin fractions can produce a polymer resin fluff having bimodal molecular weight distribution.

Abstract: This invention provides a multi-layer film or sheet prepared by coextruding or laminating polypropylene with one or more polyethylene(s), characterised in that the adhesion between a polypropylene layer and a polyethylene layer is provided by a metallocene-produced polyethylene.

Abstract: A homogeneous blend of a low density polyethylene with a metallocene-catalysed polyethylene having a density of from 0.906 g/cm3 and a Dow Rheology Index of at least 5/MI2, MI2 being the melt index measured according to ASTMD-1238 condition 190° C./2.16 kg and the Dow Rheology Index being determined by a dynamic rheological analysis performed at 190°.

Abstract: A high gloss sheet or pipes or tubes or connector joints prepared from a metallocene-produced polyethylene having a density of from 0.910 g/cm3 up to 0.966 g/cm3, or up to homopymer densities, and a melt index MI2 of from 0.01 to 20 g/10 min.

Abstract: Linear low density polyethylene resin produced with a metallocene or a late transition metal catalyst and having a density of from 0.906 to 0.940 g/cm3, a melt index MI2 of from 0.001 to 150 g/10 min, a DRI larger than 20/MI2 and a molecular weight distribution of less than 4.

Abstract: A process for producing bimodal polyethylene resins in two reactors in series, the process comprising producing a first polyethylene resin fraction in a first slurry loop reactor in a diluent in the presence of a catalyst and producing a second polyethylene resin fraction in a second slurry loop reactor, serially connected to the first reactor, in the diluent in the presence of the catalyst, the first polyethylene resin fraction being passed from the first reactor to the second reactor together with the catalyst, one of the first and second reactors producing a resin fraction of higher molecular than the resin fraction produced by the other of the first and second reactors, characterised in that the first reactor is fed with a feed of ethylene and diluent having an ethylene content of at least 70 wt % based on the weight of the diluent and in that in the first reactor the slurry of polyethylene in the diluent has a solids content of at least 30 wt % based on the weight of the diluent

Abstract: A process for producing polyolefins having a bimodal molecular weight distribution, the process comprising producing a first polyolefin fraction in the presence of a catalyst in a first loop reactor, and producing a second polyolefin fraction in the presence of the catalyst in a second loop reactor which is serially connected to and downstream of the first loop reactor, the first and second polyolefin fractions being blended in the second loop reactor to form a polyolefin having a bimodal molecular weight distribution, at least the first loop reactor containing a diluent under supercritical conditions which is circulated around the loop of the reactor, and wherein at least the first loop reactor is provided with a fluff concentrating device communicating with the loop and in which polyolefin fluff of the first fraction is concentrated in the supercritical diluent, and polyolefin fluff of the first polyolefin fraction is transferred together with an amount of supercritical diluent from the fluff concentrating