The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 10, 1976
Filed:
Nov. 17, 1972
Gabriele Lugli, San Donato Milanese, IT;
Alessandro Mazzei, San Donato Milanese, IT;
Gabriele Modini, San Donato Milanese, IT;
Snamprogetti S.p.A., San Donato Milanese, IT;
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.