PROCESS FOR PRODUCING POLYMERS

Abstract: process of producing a polymer comprising (i) feeding a monomer stream containing the monomers for producing the polymer into a polymerization unit comprising at least one reaction vessel where at least one reaction mixture comprising a polymer is produced in a polymerization reaction in the presence of at least one solvent and at least one catalyst, (ii) feeding at least a fraction of a reaction mixture produced in the polymerization unit comprising a polymer, catalyst and, optionally monomer, into a recycle line to form a recycle stream, (iii) reducing the temperature of the recycle stream, (iv) feeding the recycle stream, after its temperature has been reduced, into the polymerization unit, the monomer stream or both, and wherein the polymer is an elastomer selected from (a) ethylene/alpha-olefin copolymers with at least 20% by weight of units derived from ethylene and which, optionally may further comprise units derived from at least one non-conjugated diene having from 6 to 30 carbon atoms, preferably selected from dicyclopentadiene (dcpd), 5-ethylidene-2-norbornene (enb), 5-vinyl-2-norbornene (vnb) and a combination thereof, (b) polybutadienes and (c) butadiene copolymers with at least 50% by weight of units derived from butadiene, wherein, preferably, at least one reaction vessel of the polymerization unit has a reactor volume of at least 4 liters and wherein the process, preferably, further comprises a step (v) comprising removing solvent and isolating the polymer from a reaction mixture produced in the polymerization unit, preferably by feeding a reaction mixture produced in the polymerization unit to at least one work up section for removing the solvent and isolating the polymer.

Inventor(s): Harmen Jan BOONSTRA, Ronaldus Jacobus Maria HUYPS, Wouter VAN MEERENDONK, Gerardus VAN DOREMAELE

CPC Classification: C08F2/01 (MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS)

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