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AssigneeHostalen Polyethylen GmbH
InventorsJoachim Berthold, Ludwig Böhm, Johannes Friederich Enderle, Rainer Münnig, Paul-Richard Schöneborn
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The novel process for preparing ethylene copolymers by polymerizing ethylene with, as comonomer, up to 10% by weight, based on the total amount of the monomers, of a 1-olefin of the formula R—CH═CH2, where R is a straight-chain or branched alkyl radical having from 1 to 4 carbon atoms, is carried out in a polymerization reactor and in suspension with a dispersion medium at a temperature of from 20 to 100° C. and a pressure of from 2 to 20 bar, in the presence of a catalyst. The dispersion medium is then separated from the polymer. After carrying out the polymerization, but before removing the dispersion medium from the polymer, the suspension stream is partly evaporated, with the result that some of the wax formed in the polymerization is adsorbed onto the polymer and the resultant vapor stream is fed directly into the reactors after condensation or back into the process after distillative removal of the comonomer.
A process for preparing ethylene copolymers by polymerizing ethylene with, as comonomer, up to 10% by weight, based on the total amount of the monomers, of a 1-olefin of the formula R—CH═CH2, where R is a straight-chain or branched alkyl radical having from 1 to 4 carbon atoms, in a polymerization reactor and in suspension with a dispersion medium at a temperature of from 20 to 100° C. and a pressure of from 2 to 20 bar, in the presence of a catalyst, followed by separation of the dispersion medium from the polymer, which comprises, after carrying out the polymerization and before removing the dispersion medium from the polymer, partly evaporating the suspension stream, with the result that some portion of the wax formed in the polymerization is adsorbed onto the polymer, and feeding the resultant vapor stream directly into the reactor after condensation or back into the reactor after distillative removal of the comonomer.
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