KATALYSATOREN UND VERFAHREN ZUR HERSTELLUNG VON KATALYSATOREN FUER DIE ETHYLENPOLYMERISATION

摘要

PCT No. PCT/FR93/00996 Sec. 371 Date Jun. 7, 1994 Sec. 102(e) Date Jun. 7, 1994 PCT Filed Oct. 8, 1993 PCT Pub. No. WO94/09044 PCT Pub. Date Apr. 28, 1994.This catalyst consists of the reaction product, with at least one organomagnesium compound and/or organolithium compound R1Li (R1=alkyl) or ArLi (Ar=phenyl or benzyl), of the reaction product of (Cp)2MX2Li(OR2)2 (M=lanthanide, Sc, Y; (Cp)=optionally substituted cyclopentadienyl; and R=alkyl), with at least one bidentate ligand, such as beta -diketone or beta -keto imine CZ3COCHZCDCZ3, Z selected from halogen, alkyl and H, D=O, NH or NR3 (R3=alkyl or aryl); and phosphorus ylid R23P=CA-CO-R2, R2 chosen from alkyl and aryl; A=alkyl or H. It advantageously takes the form of a solution at least partially containing an aromatic hydrocarbon. The process for the polymerization of ethylene may be carried out at 20 DEG -250 DEG C. at a pressure which may range up to approximately 200 bars, in solution or in suspension in an at least C6 inert hydrocarbon or may be carried out continuously, in at least one autoclave or tubular reactor, at 150 DEG -300 DEG C., at 400-2000 bars, the reaction medium being in the supercritical state.