The instant invention provides a process for substantially reducing the polymer cement viscosity or reducing the molecular weight distribution of the a conjugated diene polymer synthesized by using a charge of catalytically effective amounts of a rare earth catalyst and an organo magnesium component by adding an organo zinc component to the charge in an amount and under conditions sufficient to reduce the polymer cement viscosity. The invention also contemplates a catalyst compostion for substantially reducing the polymer cement viscosity of a polymer product as well the resultant polymer product.
                            本发明提供了一种工艺,该工艺通过使用催化有效量的稀土催化剂和
有机镁组分的加料,在足以降低聚合物粘合剂粘度的量和条件下加入
有机锌组分,从而大幅降低聚合物粘合剂粘度或减少共轭二烯聚合物的分子量分布。本发明还考虑了一种催化剂组合物,用于大幅度降低聚合物产品以及由此产生的聚合物产品的聚合物胶结粘度。