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Rotational moulding process for polymerizing or copolmerizing ethylene for manufacturing ethylene polymers or copolymers having a controlled particle size and morphology. Ethylene is polymerized or copolymerized under ethylene polymerizing conditions in the presence of a supported metallocene cataly

Rotational moulding process for polymerizing or copolmerizing ethylene for manufacturing ethylene polymers or copolymers having a controlled particle size and morphology. Ethylene is polymerized or copolymerized under ethylene polymerizing conditions in the presence of a supported metallocene catalyst, where the average particle size of the catalyst particles is selected within the range of 14-40 μm and the residence time at the polymerization is selected so as to achieve a polymer where average particle size is between 0.2-0.5 mm and the proportion of fractions between 0.1-0.6 is at least 80%.

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1. Rotational moulding process of ethylene polymers or copolymers having a controlled particle size and morphology, wherein the process comprises following steps: 1) polymerizing or copolymerizing of ethylene under ethylene polymerizing conditions in the presence of a supported metallocene cataly

1. Rotational moulding process of ethylene polymers or copolymers having a controlled particle size and morphology, wherein the process comprises following steps: 1) polymerizing or copolymerizing of ethylene under ethylene polymerizing conditions in the presence of a supported metallocene catalyst having an average particle size within the range of 10-40 μm and selecting the residence time at the polymerization so as to achieve a polymer having an average particle size between 0.2-0.5 mm and the proportion of the fraction between 0.1 mm and 0.6 mm being at least 80%, and the metallocene catalyst being supported on a carrier, which is selected from alumina, silica or silica-alumina, and 2) rotation moulding of the polymer achieved in 1) without additional pelletizing, grinding or mixing steps. 2. Process according to claim 1, wherein in step 1) the polymer is produced in a slurry polymerization reactor, where the average residence time is 30-120 minutes. 3. Process according to claim 1, wherein in step 1) the polymer is produced in a slurry polymerization reactor, where the average residence time is 40-90 minutes. 4. Process according to claim 1, wherein in step 1) the polymer is produced in a gas phase reactor, where average residence time is 4-8 hours. 5. Process according to claim 1, wherein said metallocene is a metallocene compound having a formula (RnCp)mMR'oXp,where Cpis an unsubstituted or substituted and/or fused homo or heterocyclopentadienyl, R is a substituent of Cp ring and a group having 1-4 atoms and bridging two Cp rings, M is a transition metal group 4A, 5A or 6A (Hubbard), R' is C1-C2hydrocarbyl or hydrocarboxy group and X is a halogen atom and wherein m is 1-3, n is 0 or 1, o is 0-3, p is 0-3. 6. Rotational moulding product obtained by a process according to claim 1.