| 摘要 |
This dialkylmagnesium is represented by the formula R-(CH2-CH2)n-Mg-(CH2-CH2)n'-R', (E-O-E')x, where R and R' each independently represent a C1-C20 hydrocarbon residue, branched or not, substituted or not, of the alkyl, cycloalkyl or aralkyl type; n and n', identical or substantially identical, represent an average number of -CH2-CH2- linkages such that the average number of carbon atoms in each of the two chains borne by Mg is greater than 20; E and E', identical or different, each represent an alkyl radical, linear or cyclical, branched or not; and 0</=x</=2, x being the average value of the number of moles of E-O-E' ether complexed to the dialkylmagnesium. In order to prepare a dialkylmagnesium of this type, ethylene is polymerized in an anhydrous, de-oxygenated hydrocarbonaceous solution by means of a catalyst Cp*2MCl2Li(OEt2)2 (Cp*=a pentamethylcyclopentadienyl ligand; M=scandium, yttrium or a metal of the lanthanide series; Et=ethyl), in the presence of a dialkylmagnesium, soluble in the solvent, of the formula R-Mg-R', (E-O-E')x, where R, R', E, E' and x are as defined above, as a chain-transfer agent, and the reaction is stopped before the polydispersity of the polymer product obtained exceeds 2, preferably before it exeeds 1.5.
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| 申请人 |
ENICHEM S.P.A. - FRANCE UNIVERSITE DES SCIENCES ET TECHNOLOGIES DE LILLE;UNIV LILLE SCIENCES TECH |
发明人 |
PELLETIER, JEAN-FRANCOIS;BUJADOUX, KAREL;OLONDE, XAVIER;ADISSON, EMMANUEL;MORTREUX, ANDRE;CHENAL, THOMAS |
