This disclosure provides for polymerization processes of polyolefins wherein the melt index can be regulated. For example, there is provided a process for producing a polyethylene, the process comprising: (1) in a polymerization reactor, contacting (a) a polymerization catalyst, (b) ethylene, (c) an optional α-olefin comonomer, and (d) (x+y) ppm by weight of an antistatic agent on an ethylene basis; and (2) applying reaction conditions to the reaction mixture suitable to produce the polyethylene having a desired set of characteristics, such as desired target melt index. The disclosed polymerization processes allow for production of polyolefins having higher melt indices, and in the alternative to produce polyolefins having a desired target melt index at lower polymerization temperatures.
本公开提供了可调节熔融指数的聚烯烃聚合工艺。例如,提供了一种生产聚
乙烯的工艺,该工艺包括:(1)在聚合反应器中,将(a)聚合催化剂、(b)
乙烯、(c)任选的α-烯烃共聚单体和(d)(x+y)ppm重量比的
抗静电剂(以
乙烯为基准)进行接触;以及(2)对反应混合物施加适当的反应条件,以生产出具有所需的一系列特性(如所需的目标熔融指数)的聚
乙烯。所公开的聚合工艺可以生产出具有较高熔融指数的聚烯烃,也可以在较低的聚合温度下生产出具有所需目标熔融指数的聚烯烃。