Patent ID: 8173569
Filing Date: 2012-05-08
Classification: C08F

Abstract:
1. A Ziegler-Natta procatalyst composition comprising: a spray drying products of a liquid composition comprising reduced titanium tetrachloride with magnesium metal in the presence of a Lewis base electron donor free of substituents containing active hydrogen as the sole electron donor; wherein the spray drying products of the liquid composition are solid particles, characterized in that the concentration of a magnesium chloride in the spray dried liquid composition is greater than 90 percent of the saturation concentration of the magnesium chloride at the temperature of the atomization; and wherein said Ziegler-Natta procatalyst composition is in the form of solid particles and comprising magnesium chloride and transition metal moieties, said particles having an average size (D50) of from 10 to 70 μm and comprising at least 5 percent of the particles having internal void volume substantially or fully enclosed by a monolithic surface layer (shell), said layer having an average shell thickness/particle size ratio (Thickness Ratio) determined by Scanning Electron Micrograph (SEM) techniques for particles having particle size greater than 30 μM of greater than 0.2.