Abstract: The present invention relates to a continuous process for controlling the gas-phase co-polymerisation of olefins in a fluidised bed reactor. The present invention further relates to a method for the continuous gas-phase (co-)polymerisation of olefins in a fluidised bed reactor in the presence of a polymerisation catalyst wherein the density of the polymer powder particles leaving the reactor is maintained constant by controlling the particle size distribution of the polymerisation catalyst. The present invention also relates to a process for controlling the particle size distribution of a polymerisation catalyst in order to achieve the production of a polymer powder of constant density during the continuous gas-phase (co-)polymerisation of olefins in a fluidised bed reactor.

Abstract: The present invention relates to a continuous process for controlling the gas-phase co-polymerisation of olefins in a fluidised bed reactor. The present invention further relates to a method for the continuous gas-phase (co-)polymerisation of olefins in a fluidised bed reactor in the presence of a polymerisation catalyst wherein the density of the polymer powder particles leaving the reactor is maintained constant by controlling the particle size distribution of the polymerisation catalyst. The present invention also relates to a process for controlling the particle size distribution of a polymerisation catalyst in order to achieve the production of a polymer powder of constant density during the continuous gas-phase (co-)polymerisation of olefins in a fluidised bed reactor.

Abstract: A continuous process for gas phase coating of polymerization catalyst. The polymerization catalyst is introduced in a gas phase plug flow type reactor wherein it is submitted to polymerization conditions in the presence of at least one monomer such that at least 95% by weight of the produced coated catalysts have a coating yield comprised between 0.5 to 2 times the average coating yield.

Abstract: A process for preventing polymeragglomeration and for controlling the density of copolymer produced by an alpha-olefin copolymerization process in a polymerization reactor, wherein the ratio of the flow rates of introduction of the comonomer(s) to the monomer is kept constant.

Abstract: A process for the gas-phase (co-)polymerization of olefins in a fluidized bed reactor using a metallocene catalyst in that the polymerization is preformed in the presence of a process aid additive selected from at least one of 1) a polysulfone copolymer, 2) a polymeric polyamine, or 3) an oil-soluble sulfonic acid.

Abstract: A process for preventing polymeragglomeration and for controlling the density of copolymer produced by an alpha-olefin copolymerization process in a polymerization reactor, wherein the ratio of the flow rates of introduction of the comonomer(s) to the monomer is kept constant.

Abstract: A process for the gas-phase (co-)polymerisation of olefins in a fluidised bed reactor using a metallocene catalyst. The polymerisation is performed in the presence of a process aid additive.

Abstract: A process for introducing a solid catalyst particle feed into a fluidised or agitated vessel utilising a feed delivery device, a vertical feed dilution pipe and a feed injection pipe connected to the vessel, the process including the steps of: (a) introducing the solid catalyst particles feed from the feed delivery device into the vertical feed dilution pipe, (b) diluting the solid catalyst particles feed by letting the solid particle reaching by gravity their terminal velocity in the feed dilution pipe, (c) introducing the diluted solid catalyst particles feed into the injection pipe and mixing it with conveying gas, and introducing the gas conveyed diluted solid catalyst particles feed into the vessel.

Abstract: The present invention relates to a process for continuous gas phase polymerization of olefin(s) in a reactor containing a fluidized bed, consisting of a cylinder with a vertical side wall and of a desurging or disengagement chamber (3) mounted above the said cylinder, characterized in that the fluidized bed occupies at least all of the cylinder with a vertical side wall of the reactor.

Abstract: A continuous process for gas phase coating of polymerisation catalyst. The polymerisation catalyst is introduced in a gas phase plug flow type reactor wherein it is submitted to polymerisation conditions in the presence of at least one monomer such that at least 95% by weight of the produced coated catalysts have a coating yield comprised between 0.5 to 2 times the average coating yield.

Abstract: The present invention relates to a process for continuous gas phase polymerization of olefin(s) in a reactor containing a fluidized bed, consisting of a cylinder with a vertical side wall and of a desurging or disengagement chamber (3) mounted above the said cylinder, characterized in that the fluidized bed occupies at least all of the cylinder with a vertical side wall of the reactor.

Abstract: The present invention relates to a process for continuous gas phase polymerization of olefin(s) in a reactor containing a fluidized bed, consisting of a cylinder with a vertical side wall and of a desurging or disengagement chamber mounted above the said cylinder, characterized in that the fluidized bed occupies at least all of the cylinder with a vertical side wall of the reactor.

Abstract: The present invention relates to a process for introducing a solid catalyst into a gas-phase olefin polymerization reactor. It comprises in particular storing the catalyst in the form of a dry powder in a hopper, withdrawing from the hopper a measured amount of the said catalyst, introducing the said amount of the catalyst and a liquid hydrocarbon into a mixing chamber, mixing the said catalyst with the said liquid hydrocarbon so as to form in the said chamber a suspension of the entrained catalyst with the said liquid hydrocarbon, and introducing the said suspension into the said reactor. In a preferred form, the liquid hydrocarbon is continuously introduced into the chamber and forms a continuous stream to which is added the measured amount of the catalyst and which flows into the reactor.