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:
Sep. 05, 2023
Filed:
Jan. 16, 2019
Versalis S.p.a., San Donato Milanese, IT;
Giovanni Ricci, Parma, IT;
Anna Sommazzi, Novara, IT;
Guido Pampaloni, Pontedera, IT;
Giuseppe Leone, Milan, IT;
Francesco Masi, Sant'angleo Lodigiano, IT;
Versalis S.P.A., Milanese, IT;
Abstract
Process for the preparation of polyisoprene with a mainly alternating cis-1,4-alt-3,4 structure comprising polymerizing isoprene in the presence of a catalytic system comprising: (a) at least one pyridyl iron complex having general formula (I): wherein: Ris selected from linear or branched C-C, preferably C-C, alkyl groups, optionally substituted cycloalkyl groups, optionally substituted aryl groups; Ris selected from linear or branched C-C, preferably C-C, alkyl groups; X, mutually identical or different, represent a halogen atom such as, for example, chlorine, bromine, iodine; or they are selected from linear or branched C-C, preferably C-C, alkyl groups, —OCORgroups or —ORgroups wherein Ris selected from linear or branched C-C, preferably C-C, alkyl groups. n is 2 or 3; (b) at least one co-catalyst selected from organo-derivative compounds of aluminum, preferably from (b) aluminoxanes having general formula (II):(R)—Al—O—[—Al(R)—O—]—Al—(R)  (II) wherein R, Rand R, mutually identical or different, represent a hydrogen atom, or a halogen atom such as, for example, chlorine, bromine, iodine, fluorine; or they are selected from linear or branched C-Calkyl groups, cycloalkyl groups, aryl groups, said groups being optionally substituted with one or more silicon or germanium atoms; and m is an integer ranging from 0 to 1000; (b) aluminum compounds having general formula (III):Al(R)(R)(R)  (III) wherein Ris a hydrogen atom, or is selected from linear or branched C-Calkyl groups, cycloalkyl groups, aryl groups, alkylaryl groups, arylalkyl groups, alkoxy groups; Rand R, mutually identical or different, are selected from linear or branched C-Calkyl groups, cycloalkyl groups, aryl groups, alkylaryl groups, arylalkyl groups; wherein the molar ratio between the aluminum present in the co-catalyst and the iron present in the iron pyridyl complex having general formula (I) is ranging from 5 to 60, preferably from 8 to 55.