Abstract: The present invention relates to a process for preparing a solid catalyst component suitable for producing polyethylene and its copolymers, said process comprising the steps of: (a) contacting a dehydrated support having hydroxyl groups with a magnesium compound having the general formula MgR1R2; (b) contacting the product obtained in step (a) with modifying compounds (A) and/or (B) and/or (C), wherein: (A) is at least one oxygen and/or nitrogen comprising organic compound; (B) is a compound having the general formula R11f(R12O)gSiXh, (C) is a compound having the general formula (R13O)4M, and (c) contacting the product obtained in step (b) with a titanium halide compound having the general formula TiX4, wherein Ti is a titanium atom and X is a halide atom, wherein an organometallic compound is added either before step (a) and/or after step (c). The invention also relates to a solid catalyst component obtainable by said process.

Abstract: The present invention relates to a process for preparing a solid catalyst component suitable for producing polyethylene and its copolymers, said process comprising the steps of: (a) contacting a dehydrated support having hydroxyl groups with a magnesium compound having the general formula MgR1R2; (b) contacting the product obtained in step (a) with modifying compounds (A) and/or (B) and/or (C), wherein: (A) is at least one oxygen and/or nitrogen comprising organic compound; (B) is a compound having the general formula R11f(R12O)gSiXh, (C) is a compound having the general formula (R13O)4M, and (c) contacting the product obtained in step (b) with a titanium halide compound having the general formula TiX4, wherein Ti is a titanium atom and X is a halide atom, wherein an organometallic compound is added after step (a) and before step (b). The invention also relates to a solid catalyst component obtainable by said process.

Abstract: The present invention relates to a process for preparing a solid catalyst component suitable for producing polyethylene and its copolymers, said process comprising the steps of: (a) contacting a dehydrated support having hydroxyl groups with a magnesium compound having the general formula MgR1R2; (b) contacting the product obtained in step (a) with modifying compounds (A) and/or (B) and/or (C), wherein: (A) is at least one oxygen and/or nitrogen comprising organic compound; (B) is a compound having the general formula R11f(R12O)gSiXh, (C) is a compound having the general formula (R13O)4M, and (c) contacting the product obtained in step (b) with a titanium halide compound having the general formula TiX4, wherein Ti is a titanium atom and X is a halide atom, wherein an organometallic compound is added either before step (a) and/or after step (c). The invention also relates to a solid catalyst component obtainable by said process.

Abstract: The present invention relates to a process for preparing a solid catalyst component suitable for producing polyethylene and its copolymers, said process comprising the steps of: (a) contacting a dehydrated support having hydroxyl groups with a magnesium compound having the general formula MgR1R2; (b) contacting the product obtained in step (a) with modifying compounds (A) and/or (B) and/or (C), wherein: (A) is at least one oxygen and/or nitrogen comprising organic compound; (B) is a compound having the general formula R11f(R12O)gSiXh, (C) is a compound having the general formula (R13O)4M, and (c) contacting the product obtained in step (b) with a titanium halide compound having the general formula TiX4, wherein Ti is a titanium atom and X is a halide atom, wherein an organometallic compound is added after step (a) and before step (b). The invention also relates to a solid catalyst component obtainable by said process.

Abstract: The present invention relates to a process for preparing a solid catalyst component suitable for producing polyethylene and its copolymers, said process comprising the steps of: (a) contacting a dehydrated support having hydroxyl groups with a magnesium compound having the general formula MgR1R2; (b) contacting the product obtained in step (a) with modifying compounds (A) and/or (B) and/or (C), wherein: (A) is an 4-amino-pent-3-en-2-one; (B) is a compound having the general formula R11f(R12O)g,SiXh, (C) is a compound having the general formula (R13O)4M, and (c) contacting the product obtained in step (b) with a titanium halide compound having the general formula TiX4, wherein Ti is a titanium atom and X is a halide atom. The invention also relates to a solid catalyst component obtainable by said process. The invention further relates to a process for producing polyethylene and its copolymers in the presence of the solid catalyst component and a co-catalyst.

Abstract: The invention relates to a polymerization process for the production of high density polyethylene by polymerization of ethylene in the presence of a catalyst composition comprising a chromium compound, a support material wherein the alcohol is a primary alcohol having the formula (I) wherein R, R? and R? are the same or different and respectively represent a linear or branched alkyl, cycloalkyl, phenyl or phenyl containing radicals comprising from 5 to 15 carbon atoms and wherein only one of R, R? or R? can be a hydrogen radical and/or wherein the alcohol is a secondary alcohol and/or a secondary cyclic alcohol. The catalyst composition may also comprise a titanium compound. The high density polyethylene may be applied in the production of blow molded articles.

Abstract: The present invention is directed to a polymerization process for the production of polyethylene by polymerization of ethylene in the presence of a catalyst composition comprising a porous silicon oxide support material carrying a chromium compound and a transition metal containing compound or metal halide transition metal compound. The silicon oxide support material has an average particle size between 20 um and 40 um, a pore volume between 1.8 and 2.2 ml/g and a surface area between 400 and 600 m2/g.

Abstract: The invention relates to a polymerization process for the production of high density polyethylene by polymerization of ethylene in the presence of a catalyst composition comprising a chromium compound, a support material wherein the alcohol is a primary alcohol having the formula (I) wherein R, R? and R? are the same or different and respectively represent a linear or branched N alkyl, cycloalkyl, phenyl or phenyl containing radicals comprising from 5 to 15 carbon atoms and wherein only one of R, R? or R? can be a hydrogen radical and/or wherein the alcohol is a secondary alcohol and/or a secondary cyclic alcohol. The catalyst composition may also comprise a titanium compound. The high density polyethylene may be applied in the production of blow molded articles.

Abstract: A diverter valve for use in apparatus for the conveyance of a material, comprising: an inlet port capable of being placed in fluid communication with an inlet duct for conveying the material; more than one outlet port each of which is capable of being placed in fluid communication with an outlet duct for conveying the material; a diverter tube extending between the inlet and outlet ports and movable from a first position in which it is in fluid communication with the inlet port and with one of the outlet ports and a second position in which it is in fluid communication with the inlet port and with another one of the outlet ports; sealing means positioned between each of the inlet and outlet ports and the diverter tube; and a seal protection member positioned between the diverter tube and the sealing means of at least one of the outlet ports to protect the sealing means during movement of the diverter tube.