公开(公告)号：US3980623A

公开(公告)日：1976-09-14

申请号：US494021

申请日：1974-08-02

申请人： John H. Staib ,  Joseph Wagensommer

发明人： John H. Staib ,  Joseph Wagensommer

IPC分类号： C08F4/00 ,  C08F4/60 ,  C08F4/68 ,  C08F210/18

CPC分类号： C08F210/18

摘要： This invention is directed to a process for preparing copolymers of ethylene with certain alpha olefins and nonconjugated dienes. The novel aspect of this invention relates to a catalyst system comprising a vanadium tetrachloride catalyst in conjunction with a cocatalyst comprising equimolar quantities of ethyl aluminum dichloride and tri-isobutyl aluminum. Isobutyl aluminum dichloride may be substituted for the ethyl aluminum dichloride. The product prepared by this process has a high number average molecular weight and is high in tensile strength when compounded with carbon blacks or mineral fillers and extender oils. Additionally, the polymer of this invention exhibits a rapid cure rate. Since the product further exhibits a narrow molecular weight distribution and low crystallinity, there is a greatly reduced die swell upon extrusion. The combination of the high molecular weight, narrow molecular weight distribution and low crystallinity produce a vulcanized product of low compression set.

摘要翻译： 本发明涉及制备乙烯与某些α-烯烃和非共轭二烯的共聚物的方法。 本发明的新颖方面涉及包含四氯化钒催化剂与包含等摩尔量的二氯乙基铝和三异丁基铝的助催化剂的催化剂体系。 异丁基二氯化铝可以代替二氯化乙基铝。 通过该方法制备的产物具有高数均分子量，并且当与炭黑或矿物填料和增量油混合时具有高拉伸强度。 此外，本发明的聚合物表现出快速的固化速率。 由于产物进一步表现出窄的分子量分布和低的结晶度，因此挤出时的模头膨胀大大降低。 高分子量，窄分子量分布和低结晶度的组合产生低压缩固化的硫化产品。