在阴离子聚合引发剂的存在下，乙烯基芳族单体，之后的共轭二烯单体或它们两者的聚合反应中，以停止聚合反应除了烷氧基铝化合物的用于制备末端改性聚合物。 可替换地，通过在适当位置的烷氧基铝化合物的加入卤化铝化合物，也通过用具有碳原子数为1〜4的低级醇反应停止聚合反应后，有可能产生一个末端改性聚合物。 将所得的末端改性的聚合物，使之提高用作这种制剂汽车充气轮胎橡胶组合物中二氧化硅的分散性。

In the presence of an anionic polymerization initiator, the vinyl aromatic monomer, after the conjugated diene monomers, or both of them by the polymerization reaction, there to stop the polymerization reaction addition of alkoxy aluminum compounds for producing a terminal-modified polymer. Alternatively, after stopping the polymerization reaction by adding an aluminum halide compound in place of the alkoxy aluminum compounds, also by reaction with a lower alcohol having 1 to 4 carbon atoms, they can be prepared terminal-modified polymer. The resulting end-modified polymer and allowed to improve the dispersibility of the silica used as such compounding agents automotive pneumatic tire rubber composition.