A method for the production of polyolefin powder with a controlled morphology with the use of a metallocene catalyst support strength gating system.

摘要

Olefin polymers and copolymers having controlled morphology are prepared by bulk or slurry polymerization using metallocene catalysis in the presence of an alumoxane cocatalyst. Prepolymerization at a temperature of -10 °C to +35 °C during 1.5 to 3.5 minutes is immediately followed by polymerization at 55-70 °C. The fluff has a narrow grain size distribution, a smooth surface and a high bulk density.