Patents by Inventor Elena Yakovlevna Mandelshtam

Elena Yakovlevna Mandelshtam 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).

  • Method for preparing copolymers from conjugated dienes and monovinylaromatic compounds with random distribution of monomer units
    Patent number: 3972863
    Abstract: A method of preparing copolymers of conjugated diene monomers and monovinylaromatic monomers having a random distribution of monomer units in the presence of a catalyst, metallic lithium in granules, and a modifying additive soluble in a reaction medium and consisting of reaction products of potassium or sodium carbonate, acetate or hydroxide with organoaluminum compound of the general formula:AlR'.sub.m R.sub.n, in which: R' -can be alkyl, aryl, aralkyl, group- OR'", -SR'" or -NR.sub.2 '"; R" - is alkoxy or aryloxy radicals; R'"- -can be hydrogen, alkyl, aryl, aralkyl; m and n - are integers from 0 to 3, inclusive, in case of the said carbonates and acetates, m - are integers from 0 to 2, inclusive, and n-are integers from 1 to 3, inclusive, in case of the said hydroxides. In the above mentioned product the ratio of g-atoms of aluminum per 1 g-atom of potassium or sodium can be from 2 to 20. Copolymerization is effected in solution in liquid hydrogen solvent over a temperature range from 0.degree. to 100.
    Type: Grant
    Filed: March 5, 1974
    Date of Patent: August 3, 1976
    Inventors: Gennady Nikolaevich Petrov, Gennady Mikhailovich Tolstopyatov, Sergei Mikhailovich Krasilnikov, Nikolai Alexandrovich Juzhakov, Tatyana Alexeevna Kornilova, Svetlana Mikhailovna Lashova, Valentin Pavlovich Shatalov, Leonid Vasillevich Kovtunenko, Alexandr Julievich Shteinbok, Elena Yakovlevna Mandelshtam, Boris Sergeevich Korotkevich