The present invention relates to a novel catalytic system for polymerization, and more particularly for preparing conjugated diene polymers bearing a polar function at the chain end. This catalytic system is based on a metal salt of a rare-earth metal and, as alkylating agent, an organometallic compound based on a metal belonging to the 2
nd
column or the 13
th
column of the Periodic Table, capable of transferring a polar function to the diene elastomer during the conjugated diene polymerization step. The novel catalytic system makes it possible to reduce the steps for synthesizing a chain-end functionalized elastomer, while ensuring optimal functionalization, advantageously close or equal to 100%.
本发明涉及一种新型催化体系,特别是用于制备带有极性功能的共轭二烯聚合物的催化体系。该催化体系基于一种稀土
金属的
金属盐,并且作为烷基化剂,使用基于周期表第2列或第13列
金属的有机
金属化合物,能够在共轭二烯聚合步骤中将极性功能转移给二烯弹性体。这种新型催化体系可以减少合成链端官能化弹性体的步骤,同时确保最佳的官能化,优势接近或等于100%。