Stable, hydrocarbon-soluble organobarium-, organocalcium-, and organostrontium-containing polymerization initiators are prepared by reacting certain calcium, barium or strontium alkoxides with organolithium, diorganomagnesium or triorganoaluminum compounds and combinations thereof. By way of illustration, the barium alkoxides soluble in hydrocarbon or chlorinated hydrocarbon solvents are prepared by reacting a suspension of barium amide in a hydrocarbon or a chlorinated hydrocarbon solvent with stoichiometric quantities of certain alcohols, alone or in the presence of chelating tertiary di- or polyamines. Alcohols suitable for the preparation of hydrocarbon- or chlorinated hydrocarbon-soluble barium alkoxides are C.sub.4 -C.sub.12 aliphatic and cycloaliphatic alcohols possessing alkyl branches at the one or two-positions, or mixtures of such alcohols. Other suitable alcohols are 2-alkoxy-1-alkanols and .gamma.-alkoxy-poly(ethyleneoxy)-1-ethanols.
稳定的,亲油的有机
钡、
有机钙和有机
锶聚合
引发剂是通过将某些
钙、
钡或
锶醇盐与
有机锂、二元
有机镁或三元
有机铝化合物及其组合物反应制备而成。例如,可通过在烃或
氯化烃溶剂中悬浮
钡酰胺并与一定量的某些醇(单独或与螯合三级二元或多元胺一起)反应制备亲油的或
氯化烃溶解的
钡醇盐。用于制备亲油或
氯化烃溶解的
钡醇盐的醇包括在1-2位具有烷基支链的C.sub.4-C.sub.12脂肪族和环脂肪族醇,或这些醇的混合物。其他适用的醇包括2-烷氧基-1-烷醇和.gamma.-烷氧基-聚(
乙二醇氧基)-1-
乙醇。