LIQUID RARE-EARTH ELEMENT CARBOXYLATE COMPOSITION, PROCESS OF PREPARING THIS COMPOSITION, AND POLY

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FIELD : polymerization catalysts.SUBSTANCE : invention provides rare-earth element carboxylate composition used as a part of catalytic system for polymerization of conjugated dienes and containing rare-earth element carboxylate and organic solvent, which composition is characterized by additionally containing oxyalkylenated C1-C20-alcohol with molecular mass 90 to 100000 or mixture of such oxyalkylenated alcohols. Described is also preparation of liquid rare-earth element carboxylate composition as well as conjugated diene polymerization process in presence of catalytic system to give polymer with high content of 1, 4-cis units.EFFECT : enabled preparation of stable composition suitable for preparation of stereospecific diene polymerization catalyst.5 cl, 23 ex