Abstract: The invention relates to a process for the preparation of low density polyethylene (LDPE) wherein the polymerisation takes place in a tubular reactor at peak temperatures ranging from 180° C. to 350° C. and at pressures ranging from 150 to 350 MPa and wherein the total effective length of the polymerisation reactor divided by the number of reaction zones is in the range from 230 to 350 m.

Abstract: The present invention relates to an ethylene copolymer obtained by radical polymerisation through a high-pressure process comprising (i) ?78.0 and ?99.99 mole % of recurring units derived from ethylene; (it) ?0.01 and ?22.0 mole % of recurring units derived from comonomer A according to Formula (I), wherein R1 is composed of a saturated aliphatic moiety comprising 5-40 carbon atoms or R1 is composed of a saturated aliphatic moiety and consists of hydrogen atoms and 5-40 carbon atoms; R2 is selected from —H or —CH3; R3 is selected from —O—, —(CO)—(NH)— or —(CO)—O—; n=0 or 1 The ethylene copolymers have a reduced peak melting temperature and reduced enthalpy of fusion, indicating that these ethylene copolymers have a reduced degree of crystallinity and improved clarity, combined with a desired melt mass-flow rate.

Abstract: A process for producing polyolefin particles from a polyolefin composition, comprising the steps of: a) providing a melted composition of a polyolefin and b) providing particles from the melted composition by: b1) mixing a first flow of a supercritical fluid in the melted composition in a pressure vessel to obtain a solution saturated with the supercritical fluid and b2) passing the solution from the pressure vessel through a throttling device to a spraying tower to expand the solution to obtain the polyolefin particles in the spraying tower, wherein a second flow of a supercritical fluid is injected in the throttling device, wherein the supercritical fluid is a supercritical fluid of a substance selected from the group consisting of CO2, NH3, H2O, N2O, CH4, ethane, propane, propylene, n-butane, i-butane, n-pentane, benzene, methanol, ethanol, isopropanol, isobutanol, chlorotrifluoromethane, monofluoromethane, 1,1,1,2-Tetrafluoroethane, toluene, pyridine, cyclohexane, cyclohexanol, o-xylene, dimethyl ether an

Abstract: The present invention relates to a process for recycling polyolefin, comprising the steps of: 1) feeding a solid post-consumer polyolefin composition comprising polyolefin and contaminants and a flow of an extraction fluid to an extractor having a pressure of 100-1000 bar and a temperature of 20-80° C. to obtain a solid extracted composition, 2) melting the solid extracted composition to obtain a melted composition, 3) providing particles from the melted composition by: 3a) mixing a flow of a supercritical fluid in the melted composition in a pressure vessel to obtain a solution saturated with the supercritical fluid and 3b) passing the solution from the pressure vessel through a throttling device to a spraying tower to expand the solution to obtain polyolefin particles in the spraying tower.

Abstract: The invention relates to a device (100) for injecting and mixing a reactive fluid in a flow of a process fluid for the preparation of polyolefins, comprising: •an annular part (101) having an outer wall and an inner wall (102), wherein the annular part (101) is arranged for having a flow of the process fluid in a transport direction (F); •a support structure (103) connected to the inner wall (102) of the annular part (101); •an injector part (104) mounted on the support structure (103), wherein the injector part (104) is cylindrically shaped and wherein the cylindrical axis A-A? of the injector part is parallel with a central axis of the annular part and is in the central part of the annular part (101); wherein the injector part (104) comprises a nozzle (105) for injecting the reactive fluid, disposed at a downstream side of the injector part relative to the transport direction (F); •a supply channel (106) extending from the outer wall of the annular part (101) through the support structure (103) to the nozzl

Abstract: The present invention relates to a process for recycling polyolefin, comprising the steps of: 1) feeding a solid post-consumer polyolefin composition comprising polyolefin and contaminants and a flow of an extraction fluid to an extractor having a pressure of 100-1000 bar and a temperature of 20-80° C. to obtain a solid extracted composition, 2) melting the solid extracted composition to obtain a melted composition, 3) providing particles from the melted composition by: 3a) mixing a flow of a supercritical fluid in the melted composition in a pressure vessel to obtain a solution saturated with the supercritical fluid and 3b) passing the solution from the pressure vessel through a throttling device to a spraying tower to expand the solution to obtain polyolefin particles in the spraying tower.

Abstract: The invention relates to a process for preparing a graft copolymer comprising polyethylene, comprising the steps of: A) providing an ethylene copolymer comprising side chains having C?C bond and B) reacting the ethylene copolymer of step A) with an azide at an elevated temperature in the absence of a catalyst to obtain the graft copolymer, wherein the azide compound is an azide compound having a functional group or a polymer having an azide group.

Abstract: The present invention relates to an ethylene copolymer comprising: (iv) ?78.0 and ?99.9 mol % of recurring units derived from ethylene; (v) ?0.10 and ?20.0 mol % of a recurring units derived from a comonomer A according to formula (I) wherein R1 is a moiety comprising 1-30 carbon atoms; R2 is selected from —H or —CH3; R3 is selected from —O—, —(CO)—(NH)— or —(CO)—O—; n=0 or 1; and m?1 and ?10; and (vi) ?0.01 and ?2.00 mol % of a recurring units derived from a comonomer B according to formula (II) wherein R1 is a moiety comprising 1-30 carbon atoms; each R2 may individually be selected from —H or —CH3; each of R3 is individually selected from —O—, —(CO)—(NH)— or —(CO)—O—; n=0 or 1; p=0 or 1; and m?1 and ?10; the mol % of each of (i), (ii) and (iii) being related to the sum of the mol % of (i), (ii) and (iii), the sum of the mol % of (i), (ii) and (iii) adding up to 100 mol %.

Abstract: The present invention relates to an ethylene copolymer obtained by radical polymerisation through a high-pressure process comprising (i) ?78.0 and ?99.99 mole % of recurring units derived from ethylene; (it) ?0.01 and ?22.0 mole % of recurring units derived from comonomer A according to Formula (I), wherein R1 is composed of a saturated aliphatic moiety comprising 5-40 carbon atoms or R1 is composed of a saturated aliphatic moiety and consists of hydrogen atoms and 5-40 carbon atoms; R2 is selected from —H or —CH3; R3 is selected from —O—, —(CO)—(NH)— or —(CO)—O—; n=0 or 1 The ethylene copolymers have a reduced peak melting temperature and reduced enthalpy of fusion, indicating that these ethylene copolymers have a reduced degree of crystallinity and improved clarity, combined with a desired melt mass-flow rate.

Abstract: The invention relates to a process for preparing a graft copolymer comprising polyethylene, comprising the steps of: A) providing an ethylene copolymer comprising side chains having C?C bond and B) reacting the ethylene copolymer of step A) with an azide compound in the presence of a catalyst, a free radical initiator or diphenylamine to obtain the graft copolymer, wherein the azide compound is an azide compound having a functional group or a polymer having an azide group.

Abstract: The invention relates to a process for preparing a graft copolymer comprising polyethylene, comprising the steps of: A) providing an ethylene copolymer comprising side chains having C?C bond and B) reacting the ethylene copolymer of step A) with an azide at an elevated temperature in the absence of a catalyst to obtain the graft copolymer, wherein the azide compound is an azide compound having a functional group or a polymer having an azide group.

Abstract: The invention relates to a process for preparing a graft copolymer comprising polyethylene, comprising the steps of: A) providing an ethylene copolymer comprising side chains having C?C bond and B) reacting the ethylene copolymer of step A) with an azide compound in the presence of a catalyst, a free radical initiator or diphenylamine to obtain the graft copolymer, wherein the azide compound is an azide compound having a functional group or a polymer having an azide group.

Abstract: The present invention relates to a process for the production of ethylene polymers in a tubular reactor comprising reacting in said tubular reactor a feed composition comprising ethylene and one or more composition comprising one or more cyclic olefin wherein the cyclic olefin is a compound having the structure of Formula (I): wherein R may be a moiety comprising ?1 and ?10 carbon atoms; wherein R1 and R2 may each individually be hydrogen or a moiety comprising ?1 and ?5 carbon atoms, R1 and R2 may be the same or different; wherein ? the tubular reactor may be operated at a pressure of ?200 and ?280 MPa; ? the average reaction peak temperature may be ?220° C. and ?300° C.; ? the composition comprising one or more cyclic olefin may be fed to the reactor in one or more feed inlet of said tubular reactor; and ? said cyclic olefin may be fed to the tubular reactor in quantities of ?1.0 mol %, with regards to the total feed composition.

Abstract: The invention relates to a high-pressure polymerisation process for the preparation of polyethylene. A polymer is added to the extruder via a side feed dosage unit wherein the MFIsf of the polymer added via the side feed dosage unit has a higher value than the melt flow index (MFLend) of the polyethylene end product and wherein the Mw/Mn of the end product increases at least 15% compared to the product wherein no polymer is dosed via the side feed.

Abstract: The present invention relates to an ethylene polymer comprising moieties according to Formula (IB): wherein R is a moiety comprising ?1 and ?10 carbon atoms; wherein R1 and R2 are each individually hydrogen or a moiety comprising ?1 and ?5 carbon atoms, R1 and R2 may be the same or different; wherein the ethylene polymer has a molecular weight distribution of ?3.0 and ?40.0; the ethylene polymer has a melting temperature of ?115° C.; the ethylene polymer has a density ?935 and ?960 kg/m3; the ethylene polymer is essentially free from chromium, hafnium, zirconium and tetrahydrofuran; for the fraction of the ethylene polymer having a molecular weight >100 kg/mol, the intrinsic viscosity of the ethylene polymer is related to the molecular weight according to the inequality: log I.V.<0.65*log M?3.

Abstract: The invention relates to a device (100) for injecting and mixing a reactive fluid in a flow of a process fluid for the preparation of polyolefins, comprising: an annular part (101) having an outer wall and an inner wall (102), wherein the annular part (101) is arranged for having a flow of the process fluid in a transport direction (F); a support structure (103) connected to the inner wall (102) of the annular part (101); an injector part (104) mounted on the support structure (103), wherein the injector part (104) is cylindrically shaped and wherein the cylindrical axis A-A? of the injector part is parallel with a central axis of the annular part and is in the central part of the annular part (101); wherein the injector part (104) comprises a nozzle (105) for injecting the reactive fluid, disposed at a downstream side of the injector part relative to the transport direction (F); a supply channel (106) extending from the outer wall of the annular part (101) through the support structure (103) to the nozzle (1

Abstract: A process for increasing purity of a low density polyethylene (LDPE) composition, comprising the steps of: a) providing a melted composition comprising LDPE having Mn of at least 5.0 kg/mol according to size exclusion chromatography, Mw of at least 50 kg/mol according to size exclusion chromatography, a density of 915 to 935 kg/m3 according to ISO1183 and a melt flow rate of 0.10 g/10 min to 80 g/10 min according to ISO1133:2011 measured at 190° C. and 2.16 kg, and b) providing particles from the melted composition by: b1) mixing a supercritical fluid in the melted composition to obtain a solution saturated with the supercritical fluid and b2) expanding the solution through an opening to obtain the particles.

Abstract: The present invention relates to a process for producing polyolefin particles from a polyolefin composition, comprising the steps of: a) providing a melted composition of a polyolefin and b) providing particles from the melted composition by: b1) mixing a first flow of a supercritical fluid in the melted composition in a pressure vessel to obtain a solution saturated with the supercritical fluid and b2) passing the solution from the pressure vessel through a throttling device to a spraying tower to expand the solution to obtain the polyolefin particles in the spraying tower, wherein a second flow of a supercritical fluid is injected in the throttling device, wherein the supercritical fluid is a supercritical fluid of a substance selected from the group consisting of CO2, NH3, H2O, N2O, CH4, ethane, propane, propylene, n-butane, i-butane, n-pentane, benzene, methanol, ethanol, isopropanol, isobutanol, chlorotrifluoromethane, monofluoromethane, 1,1,1,2-Tetrafluoroethane, toluene, pyridine, cyclohexane, cyclohex

Abstract: The present invention relates to an ethylene copolymer comprising: (iv) ?78.0 and ?99.9 mol % of recurring units derived from ethylene; (v) ?0.10 and ?20.0 mol % of a recurring units derived from a comonomer A according to formula (I) wherein R1 is a moiety comprising 1-30 carbon atoms; R2 is selected from —H or —CH3; R3 is selected from —O—, —(CO)—(NH)— or —(CO)—O—; n=0 or 1; and m?1 and ?10; and (vi) ?0.01 and ?2.00 mol % of a recurring units derived from a comonomer B according to formula (II) wherein R1 is a moiety comprising 1-30 carbon atoms; each R2 may individually be selected from —H or —CH3; each of R3 is individually selected from —O—, —(CO)—(NH)— or —(CO)—O—; n=0 or 1; p=0 or 1; and m?1 and ?10; the mol % of each of (i), (ii) and (iii) being related to the sum of the mol % of (i), (ii) and (iii), the sum of the mol % of (i), (ii) and (iii) adding up to 100 mol %.

Abstract: A process for preparing an ethylene copolymer in the presence of free-radical polymerization initiator at pressures from 150 MPa to 350 MPa and temperatures from 100° C. to 350° C., by copolymerizing ethylene and a comonomer having a C?C bond and optionally further comonomers, wherein the comonomer having the C?C bond is represented by formula wherein R1 is hydrogen or methyl; X1 is —CO—O— or —CO—NH—; R2 is —CH2—O—, —O—CO—, —Si(CH3)2—, —Si(CH3)2—O— or —CR5R6— wherein R5 and R6 are independently selected from hydrogen, methyl, ethyl and hydroxyl; n is an integer from 1 to 32 and R2 is same or different from each other when n is 2 to 32; and R3 is —C?C— and R4 is hydrogen, C1-C10 linear or branched alkyl, C1-C10 linear or branched hydroxyalkyl or phenyl, or the unit R3-R4 stands for wherein X2 is F, Cl, Br or I.