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Power supply cable with polypropylene High-voltage supply cable (HV) or superhigh-voltage supply cable is described. The cable includes conductor surrounded by at least one layer including polypropylene. Polypropylene includes nanosize fragments of catalyst, which source of origin is solid catalyst system. Nanosize fragments of catalyst have average size of particles d50 less than 1 mcm as measured by Coulter counter LS200 at indoor temperature with n-heptane as medium. Cable manufacturing method is also described. |
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Described is a method for gas-phase polymerisation of ethylene and copolymerisation of ethylene with alpha-olefins in the presence of a supported catalyst with particle size ≥20 mcm, obtained by reacting a solution of an organomagnesium compound with a compound which enables to convert the organomagnesium compound into a solid magnesium-containing support, followed by treating the solid product with a titanium compound, where as the organomagnesium compound butylmagnesium chloride in an ether solution R2O is used, where R is butyl or i-amyl, and the compound required to convert the organomagnesium compound into a solid magnesium-containing support is a composition which includes a reaction product of an alkylchlorosilane composition R'kSiCl4-k, where R' is an alkyl or phenyl, k=1, 2, and silicon tetraalkoxide Si(OEt)4 in molar ratio SiCl/Si(OEt)=0.4-14, molar ratio Si/Mg=1-2 and temperature 10-40°C. |
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Method for obtaining semi-crystalline polymer with nucleating agents of crystallisation Invention relates to method of obtaining semi-crystalline polyolefin with nucleating agents of crystallisation by coordination polymerisation. Nucleating agent is processed with surface-active substance or modified with organoaluminium compound and dosed into polymerisation reactor in form of suspension in non-polar hydrocarbon or in form of suspension or solution in organoaluminium compound. Nucleating agent is introduced as part of catalytic system directly into polymerisation reactor, in which further synthesis is realised, and where nucleating agent represents inorganic substance, selected from the group, including talc, CaO, MgO, TiO2, silicon dioxide (SiO2), aluminium oxide (Al2O3), clay, graphite, carbon nanotubes and their combination, and where organic mucleating agent represents nucleating agent of non-sorbitol type. |
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Invention relates to polymer powder degassing. Lock is described for use during the polymer powder degassing in the degassing vessel. Lock includes temperature measurement of the polymer powder inside or at output of the degassing vessel. Comparison of the measured value with limit value to determine, weather the measured value exceeds the limit value or not. If the measured temperature is below the specified limit value executing of one or more actions directed to reduce concentration of the hydrocarbons in the polymer powder exiting the degassing vessel, and/or prevention of the polymer powder unloading from the vessel. Besides, the degassing method of the polymer powder in the degassing vessel is described. |
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Method of producing isotactic polypropylene Described is a suspension polymerisation method for producing polypropylene (PP) having a decalin-soluble (DS) fraction equal or less 2.5 wt %. The method includes at least two reactors connected in series. A Ziegler-Natta catalyst (ZN) containing an external donor agent (EDA), propylene and optionally ethylene and/or C4-C12 α-olefin, a diluent (D), containing a donor agent (DA), are fed into a first reactor and polymerisation of said polypropylene is carried out in at least said first reactor. Polymerisation in the first reactor is not preliminary polymerisation. Also described is a polymerisation method, where the weight ratio of polypropylene (PP) obtained in the first reactor (R1) and the Ziegler-Natta catalyst (ZN) catalyst present in the first reactor (R1) [mass of polypropylene (PP)/mass of Ziegler-Natta catalyst (ZN) catalyst], is greater than 1000/1 [g/g]. |
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Blocking device and method of blocking Invention relates to polymer powder degassing. It describes the blocking to be used in degassing of polymer powder inside degassing vessel. Measured is temperature of gas phase obtained at separation of fluid and vapour to be used as purging gas in said degassing vessel. Then, said temperature is compared with threshold magnitude. In case measured temperature is higher than threshold magnitude degree of vapour application as purging gas application is terminated or decreased. Besides, said blocking includes fluid level, vapour phase pressure and temperature are measured. Polymer powder degassing is described. |
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Catalyst systems and methods for use thereof to produce polyolefin products Invention relates to catalyst systems for producing polyolefins and methods for production thereof. The catalyst system includes a catalytically active compound with one type of active centres, a support which includes fluorinated aluminium oxide and aluminoxane. Content of the aluminoxane ranges from 8 mmol to 0.1 mmol per gram of the support. |
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Invention relates to synthesis of reactor powder of ultrahigh molecular weight polyethylene. Described is a method of polymerising ethylene in a medium of aliphatic solvents using a catalyst based on functionalised bis-phenoxy-imine complexes of titanium chloride, activated with methylaluminoxane MAO. The catalyst is prepared in advance in toluene solution. The catalyst system is loaded in toluene solution with two-step loading of a MAO co-catalyst. Half of the calculated amount of MAO is added first without a catalyst. A second portion of MAO is then added with a catalytic complex while stirring intensely. The speed of the mixer increased to 1300 rpm. The catalyst used is one of three functionalised phenoxy-imine titanium halide complexes of the general structure , where (I) R1=isopropylbenzyl, R2=H; (II) R1=isopropylbenzyl, R2=Me; (III) R1=t-Bu, R2=OCH3. |
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Method of producing polyolefin polymer with improved wax deposition Invention relates to a method of producing a polyolefin polymer by continuous suspension polymerisation of one or more olefin monomers in the presence of a polymerisation catalyst in at least one polymerisation reactor. The method is carried out at temperature of ot 40-120°C and pressure of 0.1-10 MPa. A suspension of solid polyolefin particles in a suspension medium is collected from the polymerisation reactor, where the suspension has a temperature of 65-120°C. The suspension collected from the polymerisation reactor is fed into a moderating vessel and held at temperature of 60-85°C for a period of time sufficiently long for the mean dwell dime of the suspension in the moderating vessel to be at least 5 minutes. The suspension from the moderating vessel is then collected and cooled to 20-55°C. The solid polyolefin particles are mechanically separated from the liquid suspension medium. |
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Multi-step process for polymerisation of olefins Process is carried out in at least two series-connected gas-phase polymerisers. The first gas-phase reactor is a fluidised-bed reactor having a gas distribution system and a sump tube. The upper opening of the tube is aligned with the gas distribution system. The tube has a layer of polyolefin particles which move from the top to the bottom of the sump tube. The process comprises feeding a liquid into the sump tube in such an amount that upward flow of the liquid is induced in the layer of polyolefin particles above the tip for feeding a fluid medium, extracting polyolefin particles from the lower end of the sump tube and transferring the extracted polyolefin particles into a second gas-phase polymeriser. A process of polymerising olefins is also described. |
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Method of polymerising olefins Present invention relates to a method of polymerising at least one alpha-olefin containing 2-12 carbon atoms in the presence of a supported chromium oxide-based catalyst. The supported chromium oxide-based catalyst is a titanium-modified supported chromium oxide-based catalyst. The chromium oxide-based catalyst is supported on a heat-resistant oxide. The titanium-modified supported chromium oxide-based catalyst is subjected to two-step heat treatment, where: (1) the first step includes heating the catalyst in an inert atmosphere to 600-900°C, holding the catalyst for 8 hours or less in the inert atmosphere at 600-900°C; and (2) the second step includes treating the catalyst obtained at step (1) in an oxidative atmosphere at 400-700°C for 2-10 hours. The maximum temperature at step 2 is always lower than the maximum temperature at step 1, wherein the difference between maximum temperature at step 1 and the maximum temperature at step 2 is 50-250°C. The catalyst is not prepared using a method for combined gelling and includes depositing a titanium compound on a support by adding and/or impregnation. |
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Polypropylene for foamed plastic and foamed polypropylene Invention relates to a polypropylene composition for foamed plastic, a method of obtaining the polypropylene composition and the foamed plastic and to foamed products, obtained from the polypropylene composition. The composition contains a polypropylene basic polymer in a quantity not less than 96 wt % of the total weight of the polypropylene composition and the content of substances, non-soluble in hot xylene, in a quantity from 0.10 to 0.30 wt % of the total weight of the polypropylene composition. The composition has an index of melt fluidity (ILF2) which constitutes at least from 1.0 to 5.0 g/10 min, melt strength F30 - not less than 30 cN, determined in the Rheotens test at 200°C, and melt tensility v30 - of less than 200 m/s, determined in the Rhoetens test at 200°C. The method of the composition obtaining includes obtaining an intermediate polypropylene, which has MFI2 in a quantity from 0.5 to 2.5 g/10 min, in the presence of an asymmetric catalyst. After that, the intermediate polypropylene is mixed with peroxide and at least one diene at a temperature, which constitutes from 20 to 90°C, for not less than 2 minutes with the formation of a preliminarily mixed material, with the following mixing in a mixing device in a melt at a temperature of an extruder cylinder from 180°C to 300°C. |
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Adamantane-containing procatalyst composition and method Present invention relates to a procatalyst composition for producing a catalyst used for olefin polymerisation. Said composition includes a combination of a magnesium-containing component, a titanium-containing component and an internal electron donor containing adamantane dicarboxylate, where the adamantane dicarboxylate has the structure (III) where R1, R2 are identical or different, each of R1 and R2 is selected from a group consisting of a substituted hydrocarbyl group containing 1-20 carbon atoms, an unsubstituted hydrocarbyl group containing 1-20 carbon atoms and combinations thereof. The invention also relates to a catalyst composition for polymerisation of olefins, which contains said procatalyst composition, and a method of producing an olefin-based polymer using said catalyst composition. |
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Method of producing highly reactive isobutene homopolymers or copolymers Invention relates to production of highly reactive isobutene homopolymers and copolymers with content of terminal vinylidene double bonds at the end of polyisobutene chains of not less than 50 mol% with respect to separate ends of the chains of polyisobutene macromolecules. An isobutene or isobutene-containing monomer mixture is polymerised in the presence of an active catalyst. The polymerisation catalyst used is a complex of an aluminium trihalide and a donor or a complex of an alkylaluminium halide and a donor. The donor is an organic compound with not less than one ether functional group or a carboxylic ester functional group. Described are isobutene polymers of general formula I and formula II |
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Methods of controlling polymerisation reactor operation Invention relates to methods of terminating polymerisation in a reactor for gas-phase polymerisation with the application of an idling mode. The method of transferring the reactor for gas-phase polymerisation into the idling mode includes: introduction of a polymerisation neutralising agent into the reactor in an amount sufficient for the termination of polymerisation in it; termination of the polymer product discharge from a reactor; termination of the supply of an initial reaction mixture and catalyst material into the reactor; adjustment of pressure in the reactor from a value of pressure in the operation mode to the value of pressure in the idling mode, adjustment of a reduced rate of the circulating fluid medium, passing through the reactor, from a value of the reduced rate in the operation mode to the value of the reduced rate in the idling mode and support of the reactor in the idling mode for the certain time period. The version of the method is also claimed. |
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Controlling h2 distribution in horizontal stirred bed reactor Invention relates to controlling olefin polymerisation. Described is a method of polymerising olefins, which includes polymerisation of at least one olefin monomer in more than one polymerisation zone in one or more reactors. Polymerisation is carried out in an apparatus having one or more reaction vessels into which an olefin monomer and catalyst components are fed and which contain a stirred layer of the formed polymer particles. The polymerisation method includes steps of: feeding into a first polymerisation zone one or more olefin monomer streams with hydrogen concentration of about 0-70 mol %; feeding into the next polymerisation zone one or more olefin monomer streams with hydrogen concentration of about 0-70 mol %; removing from the last polymerisation zone the obtained polymer with polydispersity of about 5-20. The amount of gaseous hydrogen fed into the reaction vessels by a recycling gas feeding system is set to maintain a constant flow rate of the melt of the obtained polymer. |
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Method of producing multimodal polyolefin polymer with improved hydrogen removal Invention relates to a method of producing a multimodal polyolefin polymer and an apparatus for production thereof. A method of production at temperature of 40-150°C and pressure of 0.1-20 MPa in the presence of a polymerisation catalyst in a first and a second polymerisation reactor connected in series, where in the first reactor a first polyolefin polymer is obtained in suspension in the presence of hydrogen and in the second reactor a second polyolefin polymer is obtained in the presence of a lower hydrogen concentration than in the first reactor, the method comprising: a) withdrawing from the first reactor a suspension of solid polyolefin particles in a suspension medium containing hydrogen; b) feeding the suspension into a flash drum at a lower pressure than that of the first reactor; c) vaporising part of the suspension medium; d) withdrawing a hydrogen-depleted suspension from the flash drum and feeding it into the second reactor; e) separating gas from the gas-phase of the flash drum and feeding it into a heat exchanger; f) condensing part of the gas separated from the flash drum; and g) returning the liquid obtained in the heat exchanger to the polymerisation process at a point where suspension is present. |
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Polymer material with improved strength properties Described is a polymer material based on ultra-high-molecular-weight polyethylene (UHMWPE) GUR with molecular weight of 5 mln g/mol and average particle size of 100 mcm with improved strength properties. The UHMWPE is ground to obtain a homogeneous powder with average particle size of about 50 mcm. The powder is exposed to ultrasound with frequency of 35 kHz and power of 240 W for 40 minutes. |
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Polyethylene composition and finished products obtained from it Group of inventions relates to polyethylene compositions for films or cast products. Composition has melt fluidity index at 5 kg/190°C (MI5 kg) from 0.25 to 3 g/10 min, Mz higher than 2000000 g/mol and lower than 370000 g/mol and Hostalen index (HI) value from 0.18 to 18. When melt fluidity index at 5 kg/190°C (MI5 kg) is higher than 1.9 g/10 min, Hostalen index (HI) value is higher than 1. |
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Method of polymerisation in suspension phase Invention relates to method of polymerisation in circulation reactor. Claimed is method of polymerisation in circulation reactor of at least one olefin monomer in liquid diluents in order to obtain suspension, including solid particles of olefin polymer and said diluents, with ratio of factual volume concentration of solid substances in suspension and maximally possible geometrical volume concentration of solid substances in suspension, measured as volume density of non-compacted precipitated layer of particles RVCSP, constitutes V×0.065 or more, and ratio of integral path of middle-size particle precipitation in any point of reactor in any direction, perpendicular to flow direction to internal diameter of reactor loop is supported lower than [0.084×(V-6.62)+(0.69-RVCSP)×1.666], where V represents rate of suspension circulation, expressed in m/s, integral path of precipitation is determined as the total distance, expressed in diameter parts, passed by particle in any direction, perpendicular to flow direction, after pump, located upstream flow. Circulation reactor includes vertical and horizontal sections, as well as one pump. RVCSP represents ratio between factual volume concentration of solid particles in suspension and maximally possible geometric volume concentration of solid particles in suspension. |
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Invention relates to method of obtaining homopolymers of α-olefins, in particular polyisobutylene, and copolymers of α-olefins, for example, isobutylene, 1- butene, 1-hexene, 1-octene, 1-decene, α-methyl-styrene, with dienes, for example, butadiene, isoprene, or other hydrocarbon, which contains at least one system of conjugated double carbon-carbon bonds, in presence of initiating systems. Method of obtaining poly-α-olefins or copolymers of α-olefins with dienes includes polymerisation of α-olefin or its copolymerisation with diene in medium of α-olefin monomer or hydrocarbon solvent in presence of initiating system, which includes ionic liquid and compound, which is Lewis acid. Method is characterised by the fact that quantity of added initiating system without accounting optional solvent constitutes from 0.001 to 1 g per 1 kg of initial α-olefin monomer. |
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Mixed metal catalyst systems with specifically adapted hydrogen response Described is a polymerisation catalyst system and a polymerisation method using said catalyst systems. The polymerisation catalyst systems may include a) a first catalytically active compound and b) a second catalytically active compound, the first catalytically active compound including an oxadiazole-containing compound. The oxadiazole-containing compound corresponds to the structural formula given below, wherein M is selected from a group comprising Ti, Zr and Hf; values or radicals from R2 to R10 are given in the claim |
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Invention relates to polymerisation of olefins in suspension reactors and particularly to particle size of a polymer obtained using said method. Described is a method of producing an olefin polymer by suspension polymerisation at 90-107°C in the presence of a chromium catalyst. The catalyst has activity of at least 1000 g polymer/g catalyst/h on a support with pore volume of at least 1.3 cm3/g. The method includes adding an antistatic agent to the polymerisation mixture in amount of 0.1-100 ppmw with respect to the diluent in the suspension. The obtained polymer has a particle size distribution which is such that less than 8 vol%, preferably less than 5 vol%, of the polymer particles have average diameter of 125 mcm or less. |
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Method of obtaining shock-resistant propylene polymer compositions Invention relates to a method of polymerisation for obtaining a polypropylene polymer composition. The method is performed in the presence of a system of catalysts, containing (a) solid catalytic component, which has an average size of particles from 15 to 80 mcm, containing magnesium halogenide, titanium compound, possessing, at least, a bond Ti-halogen, and, at least, two electron-donor compounds, one of which is present in an amount from 50 to 90 wt % relative to the total quantity of donors, one of which is selected from succinates, and the second is selected from 1,3-diethers, (b) alkylaluminium and, optionally, (c) internal electron-donor compound. The method includes contact of the catalytic components (a), (b) and, optionally, (c), then, preliminary polymerisation to a degree of pre-polymerisation from 0.1 to 1000 g per gram of the solid catalytic component (a), then polypropylene polymerisation with obtaining a propylene (co)polymer, at least, 85 wt % of which are not soluble in xylene at 25°C, and the following stage, carried out in a gas phase, polymerisation of the mixture of ethylene with α-olefins CH2=CHR, where R is a hydrocarbon radical, containing 1-10 carbon atoms, with obtaining an ethylene copolymer. |
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Technology of continuous discharge and pressure regulation in polymerisation reactors Method includes the supply of diluents and the first monomer into the first polymerisation reactor, formation of the first polyolefin in the first suspension, continuous discharge of the transported suspension from the first polymerisation reactor into the second polymerisation reactor. After that, the polymerisation of the second monomer is performed in the second polymerisation reactor with the formation of the second polyolefin. By means of the first discharge device of a continuous action, located on the second polymerisation reactor, pressure regulation in the second polymerisation reactor is realised and the rate of the suspension flow, discharged from the first polymerisation reactor, is supported higher than 4 ft/sec (1.2 m/s). |
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Method for gas-phase polymerisation of olefins Invention relates to a method for gas-phase polymerisation of olefins. The method for gas-phase polymerisation of one or more α-olefins in the presence of a polymerisation catalyst includes at least a polymerisation step, where polymer particles move downwards in dense form under the force of gravity such that a dense polymer layer forms, feeding anti-clogging material to said polymerisation step through at least N feed lines situated at different levels of said dense polymer layer, where N is an integer which satisfies the condition N≥(1+0.08·H), and H is the height (expressed in metres) of the polymer layer. |
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Invention relates to a technology of production of polypropylene and a copolymer of propylene with ethylene and deals with the field of enhancement and modernisation of the industrial suspension process. Described is a device for a suspension process of polymerisation of propylene or propylene and ethylene in the presence of a catalytic Ziegler system in a medium of a hydrocarbon solvent and hydrogen as the molecular weight regulator. The device contains technological sections connected to each other by technological tubing. Additionally it includes a section of recycling a solvent centrate part in polymerisation reactors and a section of vegetable oil dosing in a stream of the centrate, which is supplied in a section of the solvent separation from an atactic polymer. Partial and regulated centrate recycling from 10 to 50% to the total centrate volume is carried out. Described is a method of obtaining polypropylene at a temperature of 10-90°C and the pressure of propylene of 1-30 atm. The catalytic system includes a titanium magnesium catalyst of the grade LYNX, triethylaluminium, methylcyclohexyldimethoxysilane. The concentration of triethylaluminium is (0.2÷1.0) g/l. Polypropylene is obtained at the molar ratio of Si/Ti=1÷10, and the copolymer of propylene and ethylene at molar ratios of Si/Ti=10÷30. |
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Method for automatic control of synthesis reactor for suspension polymerisation of styrene Invention relates to automatic control systems. The invention can be used in automating operation of polymerisation reactors, having one or more control loops. The disclosed dynamic model of the process of suspension polymerisation of styrene consists of kinetic equations and a heat balance equation. A system for controlling a polymerisation process using correction of control parameters consists of two loops. The first loop provides a given rotary speed of a mixer using a controller. The second loop provides stabilisation of the temperature of the reaction mixture within the reactor using a controller. The loop for controlling the rotary speed of the reactor mixer includes correction of the given rotary speed depending on multiple quantities. The first quantity received from a control object is the control action of the temperature controller. The second quantity is calculated in a mathematical model based on general kinetic, thermal and hydrodynamic relationships of the process of suspension polymerisation of styrene. The difference between said values is transmitted to a correction unit which generates a correcting action which is transmitted to an adder, where it acts on the value of the given rotary speed of the mixer. |
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Systems and methods of polymer production Invention relates to systems and methods, intended for the regulation of properties of polymers, obtained in gas-phase and liquid-phase processes. The method of a polymer obtaining includes the introduction of a chrome-based catalyst into a gas-phase reactor system, introduction of hydrogen into the reactor system, contact of a gaseous monomer with the catalyst in the reactor system with obtaining the polymer. The polymer is discharged from the reactor system, with the discharged polymer having the first index of fluidity. The discharged polymer is processed, with the processing including granulation of the discharged polymer. The granulated polymer has the second index of fluidity. A change of the fluidity index is determined. The change of the fluidity index represents the difference between the second and the first fluidity indices. The quantity of hydrogen, introduced into the reactor system, is regulated to control the value of the fluidity index change. The method of obtaining the polymer and the polymerisation reactor system are also described. |
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Described are: a method of obtaining solid disperse particles of a catalyst component, applied for olefin polymerisation, which contains magnesium, titanium, halogen and a donor of electrons as essential composite parts, a catalyst, containing the said catalyst component, and a method of polymerisation. The method of obtaining the catalyst component includes the following stages: (1) dissolution of a magnesium halogenide in a dissolving system with the formation of a homogenous solution and optional addition of compound C - the internal donor of electrons - into the said mixture before dissolution, in the course of dissolution or after dissolution; (2) combination of a titanium compound and a co-precipitating agent with the solution from stage (1) with the formation of a mixture; (3) slow heating of the mixture from stage (2) to a temperature from 60 to 110°C, with compound D - internal donor of electrons - being optionally added in the course of heating or after heating and after achievement of a specified temperature the mixture is mixed for 0.5 to 8 hours, after which mother liquor is removed by filtration and a residual solid substance is washed with an inert solvent to obtain a magnesium- and titanium-containing solid substance; and (4) the magnesium- and titanium-containing solid substance from stage (3) is one or several times processed with the titanium compound and an optional compound E - internal donor of electrons - in an inert solvent with further washing of a solid substance with an inert solvent to obtain the catalyst component. The co-precipitating agent represents a combination of a co-precipitating agent A and a co-precipitating agent B. The agent A is, at least, one diol ester, represented by general formula (I): , in which radicals from R1 to R6 and from R1 to R2n are given in the invention formula. The agent B represents, at least, one organic silane, represented by general formula (II): R a I R b I I S i ( O R I I I ) c , in which RI and RII are given in the invention formula. |
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Systems and methods of producing polymers Described is a method of reducing change in flow index for all grain-size classes of polyolefin particles. The method includes feeding a chromium oxide-based catalyst into a gaseous reactor system to react with a gaseous monomer to obtain a polyolefin; adding alkylaluminium alkoxide into the reactor system in situ in an effective amount which is sufficient to reduce molecular weight of the polyolefin to a given value; and further measuring the flow index or melt index of the polyolefin. The polyolefin is characterised by change in flow index of no more than 3.5 times for all grain-size classes collected on sieves 18, 35 and 60 US mesh from a full set of sieves with size of 10, 18, 35, 60, 120, 200 US mesh. Also described is a polymerisation reactor system. |
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Claimed invention relates to novel metallocene compound, catalytic composition, which includes said compound, and method of obtaining olefin-based polymers with application of said composition. Metallocene compound is represented below by formula 1 , in which R1 and R2 are similar or different from each other and independently represent hydrogen, C1~C20 - alkyl group, C1~C20 - alkoxygroup, C2~C20 - alkenyl group, C6~C20 - aryl group, C7~C20 - alkylaryl group, C7~C20 - arylalkyl group or C7~C20 - alkoxyaryl group; R3 represents C1~C20 - alkylsilyl group; Q1 and Q2 are similar or different from each other and independently represent hydrogen, C1~C20 - alkyl group or halogen; and M represents Zr, Ti or Hf. |
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Additive for polyolefin polymerisation processes Invention relates to a method of polymerisation. The method of polymerisation includes the following stages: provision of a polymerisation reactor, which includes a gas-phase reactor with a fluidised bed, a carryover zone, supply of a catalyst to introduce a catalytic system, capable of producing an olefin-based polymer, supply of at least one ethylenediimine additive to supply at least one ethylenediimine additive irrespective of the catalyst mixture; (a) contact of at least one olefin with the catalytic system under conditions of polymerisation in the reactor with the fluidised bed; (b) introduction of at least one ethyleneimine additive into the reactor system at any time before, during or after initiation of the polymerisation reaction, with the ethyleneimine additive including polyethyleneimine, the ethyleneimine copolymer ora mixture of the said above; (c) monitoring a level of electrostatic activity in the carryover zone; and (d) quantity of at least one ehyleneimine additive, introduced into the reactor system, is regulated to support the level of electrostatic activity in the carryover zone close to zero or equal to zero. A version of the method is also claimed. |
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Regeneration of purifying layers by means of jet compressor in open contour Invention relates to method of regeneration of purifying layer, located on vessel, which is applied in processes of olefin polymerisation, as well as to system of regeneration of purifying layer, which is located in vessel when said process is performed. Method applied cycle with open contour. Recirculation of part of medium, discharged from vessel, as composition subjected to recirculation, is realised. The remaining part is removed into atmosphere. Method includes the following stages: a) supply of inert gas, which is under first pressure P1; b) combining inert gas with subjected to recirculation composition, discharged from vessel, with obtaining regenerating composition, which is under second pressure P2; c) supply of regenerating composition into vessel in order to regenerate purifying layer. Subjected to recirculation composition is under third pressure P3 in such a way that P1>P2>P3. |
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Propylene-based polymer, product and method of obtaining thereof Invention relates to composition of propylene-based polymers and method of their obtaining. Method of polymerisation includes bringing propylene and optionally at least one other olefin under conditions of carrying out polymerisation in contact with catalyst composition, containing substituted phenylene-aromatic diester. Obtaining propylene-based polymer, characterised by flexural modulus higher than 260 klb/in2 (1793 MPa), according to determination in accordance with document ASTM D 790. Polymer composition for obtaining moulded articles contains propylene homopolymer, characterised by flexural modulus higher than 260 klb/in2 (1793 MPa), according to determination in accordance with document ASTM D 790, and substituted phenylene-aromatic diester, selected from the group, consisting of substituted 1,2-phenylenedibenzoate, 3-methyl-5-tert-butyl-1,2-phenylenedibenzoate and 3,5-diisopropyl-1,2-phenylenedibenzoate. |
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Invention relates to steam treatment of polymer particles in a steaming apparatus after a polymerisation process. The method includes contacting polymer particles with a counter-current of steam. The flow rate of steam entering said steaming apparatus is continuously maintained proportional to the production rate of said polymerisation process in and the gradient between the temperature (Tout) of the polymer exiting said steaming apparatus and the temperature (Tin) of the polymer entering said steaming apparatus. The rate of formation of polyolefin, said temperature Tout at the output and said temperature Tin at the input are determined. Said flow rate is controlled according to a value calculated using the equation: Fsteam=K·FP·ΔTpolymer, where Fsteam is the flow rate (kg/h) of steam entering the steaming apparatus; FP is the flow rate (kg/h) of polyolefin fed at the top of the steaming apparatus; ΔTpolymer=Tout-Tin (°C); K (°C)-1 is the multiplicative constant of the steam flow rate. |
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Novel multistep method of producing polypropylene Invention relates to a multistep method of producing polypropylene by polymerisation. The method includes using at least two series-connected reactors. At step (A) a first polypropylene fraction is obtained in a first reactor. At step (B) the first polypropylene fraction fed into a second reactor. At step (C) a second polypropylene fraction is polymerised in the second reactor in the presence of the first polypropylene fraction to obtain a polypropylene composition. The first polypropylene fraction has melt flow rate MFR2 (230°C) of not more than 1.5 g/10 min or more than 2.0 g/10 min, and includes propylene units and optionally at least one C2-C10 α-olefin different from the propylene. The polypropylene composition has melt flow rate MFR2 (230°C) of more than 2.0 g/10 min and the melt flow rate MFR2 (230°C) of the polypropylene composition is different from that of the first polypropylene fraction. In the first and second reactor, polymerisation takes place in the presence of a solid catalyst system. The catalyst system has porosity of less than 1.40 ml/g and/or surface area of less than 25 m2/g and includes a catalyst which is an organozirconium compound of formula (I). |
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Catalytic component for polymerisation of olefins and catalyst, including thereof Claimed invention relates to solid catalytic component for polymerisation of olefins, including magnesium, titanium, halogen and α-cyanosuccinate compound as internal electron donor, to catalyst, including catalytic component, and to application of catalyst in polymerisation of olefins. Alpha-cyanosuccinate compound I has formula (I): |
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Method for increasing resistance of pipes to thermal-oxidative degradation Set of inventions relates to pipe and method of its production. Pipes feature resistance to thermal-oxidative degradation at pipe long-term contact with fluids containing disinfectants that possess oxidative effects. Forming composition for pipes comprises thermoplastic polyolefins and specific aromatic amines as the additive. The latter exist as fluid under standard conditions. Invention relates to the process of improving the long-term resistance of water pipes to disinfectants that feature oxidative effects. |
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Multi-step ethylene polymerisation method Invention relates to a suspension method of producing an ethylene polymer having a melt flow ratio F/P greater than 25. The method is carried out in two or more polymerisation steps at temperature of 60-120°C. At least two of the two or more polymerisation steps are carried out at different concentration of a chain-terminating agent. The method is carried out in the presence of a catalyst system containing a product obtained by contacting a solid catalyst component and an organoaluminium compound. The solid component contains Ti, Mg and halogen and has porosity (PF) measured by a mercury method, and owing to the presence of pores with a radius equal to or less than 1 mcm, of at least 0.3 cm3/g, and surface area of less than 100 m2/g. Particles of the solid component have a spherical morphology and average diameter of 8-35 mcm. |
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Catalyst on silica-clad alumina support Invention relates to catalysis. Described is an olefin polymerisation catalyst comprising: (I) a clad catalyst support comprising (a) a core which comprises alumina particles and (b) about 1-40 wt % silica, based on the weight of said cladding of the clad catalyst support on the surface of said core; said clad catalyst support having a BET surface area of not less than 20 m2/g; porosity of at least about 0.2 cm3/g; and a normalised sulphur uptake (NSU) value of up to 25 mcg/m2; and (II) 0.1-10 wt % , based on the weight of said catalyst, of catalytically active, with respect to olefin polymerisation, elemental transition metal, compound thereof, or complex thereof, wherein said transition metal is selected form Fe, Cr, Ti, Zr, Hf, Ni or mixture thereof, on the surface of said clad catalyst support. Methods of producing said catalyst and use thereof are described. |
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Films made from heterogeneous ethylene/alpha-olefin copolymer Invention relates to a multilayer film for making a finished article and a finished article having said film. The multilayer film includes at least two layers. The first layer includes a first a copolymer of ethylene and at least one alpha-olefin. The first copolymer has density of less than 0.925 g/cm3, and average viscosity molecular weight Mv and a valley temperature between the copolymer and high crystalline fraction, Thc, such that the Mv for a fraction above Thc from ATREF divided by Mv of the whole polymer from ATREF (Mhc/Mhp) is less than 1.95. The copolymer has composition distribution breadth index (CDBI) of less than 60%. One other second layer includes a second a copolymer of ethylene and at least one alpha-olefin. The second copolymer has density of 0.925-0.965 g/cm3. |
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Gas-phase polymerisation method having multiple flow modes Invention relates to an improved method for gas-phase polymerisation of olefins in two or more flow modes. Described is a method of producing polypropylene or propylene copolymer, which involves polymerisation of propylene in a reactor. The reactor has two or more different flow modes. One of the flow modes has volume content of the solid phase in a multi-phase stream greater than 15%. A system based on a mixed external electron donor is fed into the reactor, where the system contains at least one selectivity control agent and at least one activity limiting agent. A catalyst system further includes an aluminium-containing co-catalyst, where molar ratio of aluminium to the mixed external electron donor is in the range of 0.5-4.0:1. |
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Antifoulant for impact copolymers and method Invention relates to obtaining heterophasic copolymer. Active polymer from first polymerisation reactor is introduced into second polymerisation reactor. Contact of active polymer with at least one olefin is performed in polymerisation conditions in second polymerisation reactor with obtaining heterophasic copolymer, which has value of copolymer fraction (Fc) from 10 wt % to 50 wt %. Multicomponent antifoulant is introduced into second polymerisation reactor at such a rate that multicomponent antofoulant is present in heterophasic copolymer in concentration from 1 ppm to 100 ppm. Antifoulant represents multicomponent antifoulant and/or coating preparation. |
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Method of polymerising olefins Invention relates to polymerisation of olefins. Described is a method of polymerising at least one olefin monomer in more than one polymerisation zone of one or more polymerisation reactors using a highly active catalyst, which is fed into the front end of the reactor to form solid polymer particles. The method is carried out in the apparatus. |
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Impact resistant low-density polyethylene (lldpe) composition and films made therefrom Invention relates to a low-density ethylene polymer with a multimodal comonomer distribution, a method for production thereof and moulded articles, including films, made from said polymer. The multimodal polyethylene has a wide molecular weight distribution MWD in the range from 3 to 8 and contains two polymer components. The first polymer component is 70-95 wt % copolymer of ethylene with at least one C3-C20-α-olefin comonomer, having MWD less than 5, CDBI greater than 60% and high-load melt index (@21.6 kg, 190°C) of 10-100 g/10 min. The second polymer component is 5-30 wt % substantially homopolymeric polyethylene, having MWD greater than 10, CDBI greater than 80% and high-load melt index (@21.6 kg, 190°C) of 0.2-20 g/10 min. Said multimodal polyethylene is obtained in a single reactor using a catalyst system containing at least two catalysts in form of transition metal complexes. |
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Invention relates to substrate-free conducting surface coat and method of its production. Proposed surface coat includes central layer consisting of the particles produced mincing of said sheet. Said particles are sintered particles embedded in polymer matrix. Said particles and/or said polymer matrix contain conducting material. Proposed method comprises the steps that follow. a) Sheet mincing to produced said particles. b) Making the polymer-based powder for polymer matrix. c) Application of said particles on moving belt carrier. d) Application of said polymer-based powder on said particles. e) Heat treatment and compaction of said particles and said polymer-based powder at the press. |
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Method of processing nucleating layer of polymerisation reaction Invention relates to methods of nucleating layer processing before carrying out polymerisation reaction. Method of preparing reactor for carrying out polymerisation reaction includes providing at least one nucleating layer in reactor. Nucleating layer includes at least one metal-organic compound and polymer particles. Nucleating layer additionally contacts with at least one hydrocarbon in such a way that at least one hydrocarbon is present in gaseous phase of nucleating layer in amount from 2 to 8 mol.%. Also described is polymerisation method. |
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System and method of catalyst activation Described are methods of chrome catalyst activation, which include increasing chrome catalyst temperature in, at least, bilinear changing, which contains increase of chrome catalyst temperature at first speed during first period of time to first temperature on first site of changing of bilinear changing; and increase of chrome catalyst temperature at second speed during second period of time from said first temperature to second temperature on second site of changing of bilinear changing, which follows directly after first area of changing, and first speed is larger, than second speed, and first period precedes second period; with first temperature being in the range from approximately 650°C to approximately 750°C, with second temperature being in the range from approximately 750°C to approximately 850°C. Method of obtaining polyolefines in presence of catalyst, activated by claimed method, is described. |
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Pyridyldiamide transition metal complexes, production and use thereof Invention relates to a pyridyldiamide transition metal complex. The complex is described by general formula (IV), wherein M denotes Ti, Zr or Hf; R6, R7, R8 and R9 denote hydrogen; R1 and R11 are independently selected from a group including alkyls and phenyl groups containing 0-5 different substitutes which include F, Cl, Br, I, CF3, NO2, alkoxy group, dialkylamino group, hydrocarbyl (such as alkyl or aryl) and substituted hydrocarbyls (such as heteroaryl), containing 0-10 carbon atoms; R2 and R10 all independently denote -E(R12)(R13)-, where E denotes carbon, and each R12 and R13 is independently selected from a group which includes hydrogen and phenyl groups; R3, R4 and R5 denote hydrogen; L denotes an anionic splitting group, wherein the L groups may be identical or different and any of the two L groups may be bonded to form a dianionic splitting group; n equals 0, 1, 2, 3 or 4; L' is selected from a group which includes ethers, thioethers, amines, nitriles, imines, pyridines and phosphines; and w equals 0, 1, 2, 3 or 4. Also disclosed are methods of producing the complex (versions), pyridyldiamine for producing the complex, a catalyst system and a polymerisation method. |
Another patent 2551042.