Patent ID: 9522968
Filing Date: 2016-12-20
CPC Classification: C08F

Claim Text:
1. A process for producing a Ziegler-Natta catalyst for the polymerization of olefins comprising the steps of: a. combining a spherical spray-cooled MgCl b. heating the mixture in the reactor to a temperature of between about 30° C. to about 100° C.; c. concurrent with the heating in step (b), or following reaching the temperature of step (b), adding an internal electron donor consisting essentially of a diether compound to the mixture in the reactor, wherein the diether is selected such that the resulting catalyst has an activity and hydrogen response resulting in the production of propylene polymers having a molecular weight distribution in the range from about 5.75 to about 9; d. heating the resulting mixture to at least about 80′C, and holding the resulting mixture at that temperature for about 1 to 3 hours to produce a pre-catalyst; e. filtering the mixture containing the pre-catalyst while still hot to obtain the solid pre-catalyst component; f. extracting the pre-catalyst with a mixture of an organic solvent and a transition metal compound at a temperature of at least 100° C. for 1-5 hours to form a catalyst; and g. washing the catalyst with a hydrocarbon solvent and drying the catalyst under vacuum and/or elevated temperature of 30-100° C.