Abstract: Provided are bimodal medium density polyethylene compositions, and microirrigation drip tapes including the same. The bimodal medium density polyethylene compositions can be extruded at higher lines speed while maintaining other desirable properties. The bimodal medium density polyethylene compositions include a high molecular weight (HMW) polyethylene component and a low molecular weight (LMW) polyethylene component. In some embodiments, the bimodal medium density polyethylene composition has a density of from 0.937 to 0.949 g/cm3; a high load melt index (I21) from 12 to 30 g/10 min: a crossover G?=G? of from 30 to 45 kPa; and a calculated LMW density of the LWM polyethylene component of less than or equal to 0.974 g/cm3.

Abstract: A process of making a catalytically-active prepolymer composition in a slurry-phase prepolymerization reaction, the catalytically-active prepolymer composition made thereby, and a process of making a polyolefin polymer using the catalytically-active prepolymer composition in a gas-phase polymerization reaction.

Abstract: In various embodiments, a bimodal polyethylene may include a high molecular weight component and a low molecular weight component. The bimodal polyethylene may have a density of from 0.933 g/cm3 to 0.960 g/cm3, a melt index (I2) of from 0.3 dg/min to 1.2 dg/min, and a melt flow ratio (MFR21) greater than 70.0. The high molecular weight component may have a density of from 0.917 g/cm3 to 0.929 g/cm3, and a high load melt index (I21) of from 0.85 dg/min to 4.00 dg/min. The bimodal polyethylene may include from 40 wt. % to 60 wt % of the high molecular weight component. Methods for producing the bimodal polyethylene and articles manufactured from the bimodal polyethylene are also provided.