PROCESS FOR PRODUCING CARBO-CHAIN HOMOPOLYMERS, BLOCK AND RANDOM COPOLYMERS OF CONJUGATED DIENES WITH VINYLAROMATIC MONOMERS

摘要

ABSTRACT OF THE DISCLOSUREA process for producing carbo-chain homopolymers, block-and random copolymers of conjugated dienes and vinylaromaticmonomers comprising polymerization of dienes, vinyl- or di-vinylaromatic monomers or copolymerization thereof in a mediumof a hydrocarbon solvent at a temperature ranging from -30 to+150°C in the presence of an organolithium catalyst of theformula R(Li)X, wherein R is a hydrocarbon radical or a dienepolymer, x is an integer of from 1 to 4, and a modifying ad-ditive which is a compound comprising a product of interac-tion between a phenolamine resin and an alkali metal and hav-ing the general formula:wherein n is an integer of from 1 to 10;M is sodium or potassium;R is an alkyl with 2 to 20 carbon atoms or an aryl-alkyl with 7 to 20 carbon atoms;R1 is an alkyl with 1 to 6 carbon atoms, an arylalkylwith 7 to 9 carbon atoms or hydrogen;this modifying additive is used in an amount of from 0.07 to2.0 g/equiv. per one g/equiv. of active lithium.