Loading patent…
AssigneeSnamprogetti S.p.A.
InventorsGabriele Lugli, Alessandro Mazzei, Gabriele Modini
Estimating the term…
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.
Process for the stereospecific homopolymerization of a diolefin wherein the homopolymerization reaction is carried out in the presence of a catalyst selected from the uranium allyl derivatives having the formula ##EQU4## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5, the same or different, are selected from the group consisting of hydrogen atoms, alkyl radicals containing from 1 to 10 carbon atoms, aryl radicals containing from 6 to 10 carbon atoms, cycloalkyl radicals containing from 4 to 10 carbon atoms and alkylaryl radicals;
Process for the polymerization and copolymerization of olefins wherein the polymerization reaction is carried out in the presence of a catalyst selected from the uranium allyl derivatives having the formula ##EQU5## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5, the same or different, are selected from members of the group consisting of hydrogen atoms, alkyl radicals containing from 1 to 10 carbon atoms, aryl radicals containing from 6 to 10 carbon atoms, cycloalkyl radicals containing from 4 to 10 carbon atoms, and alkyl aryl radicals;
Dependencies are inferred from the claim text.