Abstract:
The present invention aims to provide a multimodal polymer of propylene comprising a matrix of semicrystalline polymer and a rubber (D) dispersed in said matrix, the multimodal polymer comprising units derived from propylene of from 85 to 99 % by weight and units derived from ethylene or C 4 to C 10 alpha-olefins of from 1 to 15 % by weight. The multimodal polymer has a fraction soluble in xylene XS at a temperature of 25 °C of from 7 to 16 % by weight, a melt flow rate MFR2 of from 0.05 to 5 g/10 min, a polydispersity index Pl of from 3.5 to 30, and a tensile modulus TM and XS meeting the relationship TM ≥ 2375 - 46.2 XS. Furthermore, the present invention aims to produce the above-mentioned multimodal polymer in a process comprising several reaction steps or zones. The compositions comprising the multimodal polymer of propylene have excellent stiffness combined with good impact strength at a low temperature.
Abstract:
The present invention relates to a process for the production of a stabilized polyolefin comprising - an olefin homo- or copolymer (A); and - an antioxidant (B) wherein olefin homo- or copolymer (A) is produced in a process carried out in one or more reactors, and the antioxidant (B) is fed during the process prior to and/or during a post-production step selected from depressurisation step, degassing step and catalyst deactivation step. The present invention furthermore relates to a polyolefin composition obtainable by the process according to the invention and the use thereof for the production of an article. The present invention is also directed to the use of an antioxidant (B) in a process for the production of a stabilized polyolefin comprising - an olefin homo- or copolymer (A); and - an antioxidant (B) during the process prior to and/or during a post-production step selected from depressurisation step, degassing step and catalyst deactivation step. An article, preferably a pipe, made of the stabilized polyolefin and/or the polyolefin composition according to the invention is also the present invention.
Abstract:
The invention relates to a reactor system for the catalytic polymerization of olefin monomer and optionally comonomer (s), comprising one or more inlets for olefin monomer, catalyst, optionally for comonomer, chain growth controllers or chain transfer agents, and/or inert gas, an outlet for gas and an outlet for polymerization particles, which reactor system comprises at least one fluidized bed unit and at least one a moving bed unit, wherein the fluidized bed unit comprises means for maintaining a fluidized bed in the fluidized bed unit and wherein the moving bed unit is provided with an inlet and an outlet which are connected to the fluidized bed unit, wherein in the fluidized bed unit is positioned shielding means such that via the outlet of the moving bed unit inflow of fluidization gas is inhibited and outflow of polymerization particles allowed and to a process and use thereof.
Abstract:
The invention relates to a reactor assembly for the production of polymers including a fluidized bed reactor (1) comprising a bottom zone (5), a middle zone (6) and an upper zone (7), an inlet (8) for the fluidization gas located in the bottom zone (5), an outlet (9) for the fluidization gas located in the upper zone (7); the outlet (9) for the fluidization gas being coupled with the fluidized bed reactor (1) via inlet (8); the equivalent cross-sectional diameter of the bottom zone (5) being monotonically increasing with respect to the flow direction of the fluidization gas through the fluidized bed reactor; the middle zone (6) having an essentially constant equivalent cross-sectional diameter with respect to the flow direction of the fluidization gas through the fluidized bed reactor; the equivalent cross-sectional diameter of the upper zone (7) being monotonically decreasing with respect to the flow direction of the fluidization gas through the fluidized bed reactor; wherein that the ratio of the height of the fluidized bed reactor to the equivalent cross- sectional diameter of the middle zone of the fluidized bed reactor is from 2 to 10; and wherein there is an unobstructed passageway in the direction of flow of the fluidization gas through the fluidized bed reactor from the bottom zone (5) to the upper zone (7).
Abstract:
Reactor assembly for the production of polymers including a fluidized bed reactor (1) comprising a bottom zone (5), a middle zone (6) and an upper zone (7), an inlet (8) for the fluidization gas located in the bottom zone (5), an outlet (9) for the fluidization gas located in the upper zone (7); the outlet (9) for the fluidization gas being coupled with the fluidized bed reactor (1) via inlet (8) via a gas circulation line; means for separation of solids from gas (2) being connected to said gas circulation line; the equivalent cross-sectional diameter of the upper zone (7) being monotonically decreasing with respect to the flow direction of the fluidization gas through the fluidized bed reactor; the middle zone (6) having an essentially constant equivalent cross-sectional diameter with respect to the flow direction of the fluidization gas through the fluidized bed reactor; the equivalent cross-sectional diameter of the bottom zone (5) being monotonically increasing with respect to the flow direction of the fluidization gas through the fluidized bed reactor; characterized in that the ratio of the height of the fluidized bed reactor to the equivalent cross-sectional diameter of the middle zone of the fluidized bed reactor is from 2 to 10; and whereby said upper zone (7) is directly connected to said middle zone (6).
Abstract:
Process for producing polyethylene compositions, like LLDPE, MDPE or HDPE, with a high level of homogeneity which comprises the steps of a) preactivating the total amount of a Ziegler-Natta procatalyst with the total amount of a cocatalyst, which cocatalyst comprises an organoaluminium compound, in order to get a preactivated Ziegler-Natta catalyst system, b) introducing the preactivated Ziegler-Natta catalyst system into a prepolymerisation reactor, wherein the preactivated Ziegler-Natta catalyst system is prepolymerised with at least one C 2 -C 10 -alpha-olefin monomer and optionally one or more C 3 -C 10 -alpha- olefin comonomer, in order to get a prepolymerisation product, c) introducing the prepolymerisation product into a first polymerisation reactor, which comprises a slurry reactor, wherein the prepolymerisation product is further polymerised with ethylene monomers and optionally one or more C 3 -C 10 -alpha-olefin comonomers in order to get a first polymerisation product, d) introducing the first polymerisation product into a second polymerisation reactor, wherein the first polymerisation product is further polymerised with ethylene monomers and optionally one or more C 3 to C 10 -alpha-olefin comonomers in order to get a second polymerisation product, e) optionally performing one or two subsequent polymerisation steps in order to get a third or fourth polymerisation product, f) further processing the obtained polymerisation product into pellets by extrusion; its use for forming articles, especially films with a low gel content.
Abstract:
Coating composition comprising an ethylene copolymer containing not more than 5 mole-% comonomer, whereby the fraction of the ethylene copolymer having a molecular weight of 300 000 g/mol - 600 000 g/mol has a methyl branching of more than 4.0 Methyl per 1000C as determined by SEC/FT-IR analysis.
Abstract:
Heterophasic propylene copolymer comprising (a) a matrix (M) being a polypropylene (PP), said polypropylene (PP) has a polydispersity index (PI) of at least 5.0, and (b) an elastomeric propylene copolymer (EC) dispersed in said matrix (M), wherein (i) said heterophasic propylene copolymer has a melt flow rate MFR 2 (230 °C) of equal or below 1.0 g/10min, (ii) the amorphous phase (AM) of the xylene cold soluble fraction (XCS) of the heterophasic propylene copolymer has an intrinsic viscosity (IV) of at least 3.5 dl/g.
Abstract:
Random propylene copolymer comprising (a) a first polypropylene being a first random propylene copolymer, said first random propylene copolymer has a melt flow rate MFR 10 (230 C) of not more than 1.5 g/10min, (b) a second polypropylene being a first propylene homopolymer or a second random propylene copolymer, (c) a third polypropylene being a second propylene homopolymer or a third random propylene copolymer, said third random propylene copolymer has a comonomer content of 0.5 to 3.5 wt. -%, wherein further (i) the first polypropylene differ from the second polypropylene and the third polypropylene by the melt flow rate MFR 2 (230 C) and/or by the comonomer content, (ii) the second polypropylene differ from the third polypropylene by the melt flow rate MFR 2 (230 C) and/or by the comonomer content [wt.-%], and (iii) the random propylene copolymer (R-PP) has a melt flow rate MFR 2 (230 C) of 0.05 to 10.00 g/10min.
Abstract:
The present invention relates to a cable comprising a conductor surrounded by one or more layers, wherein at least one layer comprises a polymer composition comprising a multimodal copolymer of ethylene with one or more comonomers, to a process for producing the cable and to a polymer composition suitable as a cable layer material.