Controlling Polyolefin Properties by In‐Reactor Blending, 1–Polymerization Process,Precise Kinetics,and Molecular Properties of UHMW‐PE Polymers

A multipurpose reactor setup for catalytic slurry ethylene polymerization is presented. With the developed multi‐stage polymerization (MSP) method the production of polyolefin in‐reactor blends is accessible. Precisely controlled polymerizations are executed at isothermal, isobaric, and isoperibolic steady state conditions in a dynamic power compensated reactor. The described system realizes fast (<10 s) and constant temperature control (±0.1 K), applying electrical heat compensation in combination with mass flow technique. Single‐ and MSP with a highly active ZN‐catalyst are applied to produce uni‐ and bimodal polyethylenes with controlled fractions of molecular weight (UHMW and medium‐MW PE). Polymerization kinetics and molecular weights (IV, GPC) are presented.