Other

Elena Yakovlevna Mandelshtam

Boris S Korotkevich

Alexandr G Liakumovich

Jury A Shmuk

Genrikh A Tolstikov

Valentin Pavlovich Shatalov

Vasily P Popov

Leonid Vasillevich Kovtunenko

Valery P Juriev

Mengzda K Sultanova

Nikolai Alexandrovich Juzhakov

Svetlana Mikhailovna Lashova

Gennady Nikolaevich Petrov

Tatyana Alexeevna Kornilova

Jury B Monakov

Gennady Mikhailovich Tolstopyatov

Sergei Mikhailovich Krasilnikov

Alexandr Julievich Shteinbok

Boris I Pantukh

A process for preparing cis-polyisoprene which comprises polymerization of isoprene in a medium of a non-polar hydrocarbon solvent at a temperature ranging from 0.degree. to 60.degree. C in the presence of a catalyst comprising a reaction product of titanium tetrachloride and an intracyclic organo-aluminium compound having the formula: ##STR1## wherein R, the same or different, are H, CH.sub.3 ; taken in a molar ratio of 1:1.05-1.1 respectively; weight ratio of isoprene to said catalyst being equal to 100:0.2-0.7. The present invention makes it possible to improve the quality of the thus-obtained cis-polyisoprene and to increase the catalyst capacity by two times due to modification of its properties.

Process for preparing cis-polyisoprene

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:

Method for preparing copolymers from conjugated dienes and

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Moscow, Russia

Elena Yakovlevna Mandelshtam