Patents by Inventor Nikolai Choubine

Nikolai Choubine has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Catalytic complexes based on lanthanides for the (co) polymerization of conjugated dienes
    Patent number: 6121429
    Abstract: Complexes of lanthanides are described, which are effective in the polymerization of conjugated dienes, obtained by reacting LnX.sub.3 with at least one Lithium compound selected from:(i) Li(A), the molar ratio Li(A)/LnX.sub.3 being from 1.5 to 2.5;(ii) LiLn(A).sub.4, the molar ratio between LiLn(A).sub.4 and LnX.sub.3 being from 0.5 to 1.5;wherein Ln is selected from any of the Lanthanides; X is selected from halides, carboxylates, alcoholates, --N(R.sub.x) (R.sub.y) wherein R.sub.x and R.sub.y, the same or different, are C.sub.1 -C.sub.5 alkyl radicals;A is an allyl radical having the general formula ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5, the same or different, are selected from hydrogen and C.sub.1 -C.sub.10 alkyl radicals.
    Type: Grant
    Filed: November 16, 1998
    Date of Patent: September 19, 2000
    Assignee: Enichem S.p.A.
    Inventors: Alessandro Balducci, Lido Porri, Nikolai Choubine