Catalyst composition for polymerizing alpha olefins and...

Details Catalyst composition for polymerizing alpha olefins and... Catalyst composition for polymerizing alpha olefins and...

C - Chemistry, Metallurgy

08

F

252/100, 402/431

C08F 4/24 (2006.01) C08F 4/62 (2006.01) C08F 10/00 (2006.01) C08F 210/16 (2006.01)

Patent

CA 1323361

579235 F-4554 ABSTRACT CATALYST COMPOSITION FOR POLYMERIZING ALPHA OLEFINS AND ALPHA OLEFINS POLYMERIZATION THEREWITH A supported catalyst for polymerizing 1-olefins, for example, ethylene, is prepared by depositing a chromium compound and a titanium compound on a refractory oxide support which is substantially non-spherical, and which has a relatively broad particle size distribution range. The catalyst is preferably combined, either outside of the polymerization vessel or in situ, with a sufficient amount of at least one magnesium composition of the formula RMgR', where R and R' are the same or different and they are C1 to C12 hydrocarbyl groups, to provide a molar ratio of magnesium to chromium in the catalyst composition of 0.01:1 to 25:1. The resulting catalyst composition has good feedability and fluidization characteristics, and it produces resins of relatively high HLMI at relatively low temperatures. There is also disclosed a process for polymerizing 1-olefins, at relatively lower temperatures than was heretofore possible, to obtain resins of relatively high HLMI, using the above-identified catalyst composition. The resulting polymers can be used for the fabrication of blow-molded products, e.g., household and industrial containers.

579235

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