Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1972-11-17
1976-02-10
Schofer, Joseph L.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
260 795C, 260 821, 260 853R, 260 949B, 260 949C, C08F 482, C08F 444, C08F13604
Patent
active
039376923
ABSTRACT:
A process for the stereospecific polymerization of olefins is described, wherein the selected monomer is homopolymerized, or the selected monomers are copolymerized, by reacting the selected monomer or monomers in the presence of a catalyst consisting of an uranium .pi. - allyl compound represented by one of the formulae: ##EQU1## in which R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5, the same or different, may be hydrogen atoms, alkyl radicals having from 1 to 10 carbon atoms, aryl radicals having from 6 to 10 carbon atoms, cycloalkyl radicals having from 4 to 10 carbon atoms, and alkylaryl radicals; the dotted line indicates the possible delocalization of the valence electrons; X is an anion selected from among Cl.sup.-, Br.sup.- and I.sup.-; and n is an integer ranging from 1 to 3; and, optionally, a co-catalyst which is a Lewis acid, or a complex thereof with an ether, a tertiary amine or a phosphine.
REFERENCES:
patent: 3379706 (1968-04-01), Wilke
patent: 3468866 (1969-09-01), Alferov et al.
patent: 3719653 (1973-03-01), Dawans
Lugli Gabriele
Mazzei Alessandro
Modini Gabriele
Holler A.
Schofer Joseph L.
Snamprogetti S.p.A.
Watson, Esq. Ralph M.
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