Long-chain dialkylmagnesium, its preparation process and applica

Details Long-chain dialkylmagnesium, its preparation process and applica Long-chain dialkylmagnesium, its preparation process and applica

1998-06-29

2000-05-16

Shaver, Paul F.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526265, 526266, 5263171, 526319, 526328, 526329, 5263297, 526341, 526348, 526352, C08F 444, C08F21000, C08F11802, C08F 2006, C08F 1102

Patent

active

060638826

ABSTRACT:
This dialkylmagnesium is represented by the formula R--(CH.sub.2 --CH.sub.2).sub.n --Mg--(CH.sub.2 --CH.sub.2).sub.n' --R', (E--O--E').sub.x, where R and R' each independently represent a C.sub.1 -C.sub.20 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 --CH.sub.2 --CH.sub.2 -- 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.ltoreq.x.ltoreq.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*.sub.2 MCl.sub.2 Li(OEt.sub.2).sub.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').sub.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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B. Bogdanovic, et al., "Diorganomagnesium Compounds from Magnesium, Hydro, and 1-Alkenes and Their Application in Synthesis,"Chem. Ber., vol. 126 (1993), pp. 1371-1383.

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