Method for homo- or copolymerization of ethene

摘要

PCT No. PCT/FI91/00397 Sec. 371 Date May 25, 1993 Sec. 102(e) Date May 25, 1993 PCT Filed Dec. 18, 1991 PCT Pub. No. WO92/12181 PCT Pub. Date Jul. 23, 1992.The invention relates to a method for homo- or copolymerizing ethene in the presence of a Ziegler-Natta or other catalyst and a possible comonomer and hydrogen for preparing a homo- or copolymer of ethene in particle form in propane. In accordance with the invention, the polymerization is performed in a loop reactor under such supercritical conditions where the temperature is higher than the critical temperature of the mixture formed by ethene, propane and a possible hydrogen and a comonomer, but lower than the melting temperature of the ethene polymer forming in the polymerization, and the pressure is higher than the critical pressure of said mixture.