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AssigneeChevron Phillips Chemical Company LP
InventorsMax P. McDaniel, Carlton E. Ash, Kathy S. Clear, Eric D. Schwerdtfeger, Carlos A. Cruz, Jeremy M. Praetorius
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Supported chromium catalysts containing a solid oxide and 0.1 to 15 wt. % chromium, in which the solid oxide or the supported chromium catalyst has a particle size span from 0.5 to 1.4, less than 3 wt. % has a particle size greater than 100 μm, and less than 10 wt. % has a particle size less than 10 μm, can be contacted with an olefin monomer in a loop slurry reactor to produce an olefin polymer. Representative ethylene-based polymers produced using the chromium catalysts have a HLMI of 4 to 70 g/10 min, a density from 0.93 to 0.96 g/cm3, from 150 to 680 ppm solid oxide (such as silica), from 1.5 to 6.8 ppm chromium, and a film gel count of less than 15 catalyst particle gels per ft2 of 25 micron thick film and/or a gel count of less than or equal to 50 catalyst particles of greater than 100 μm per five grams of the ethylene polymer.
A supported chromium catalyst comprising a solid oxide and from 0.1 to 15 wt. % chromium, wherein the supported chromium catalyst is characterized by:
A supported chromium catalyst comprising a solid oxide and from 0.1 to 15 wt. % chromium, wherein the supported chromium catalyst is characterized by:
A supported chromium catalyst comprising a solid oxide and from 0.1 to 15 wt. % chromium, wherein the supported chromium catalyst is characterized by:
A supported chromium catalyst comprising a solid oxide and from 0.1 to 15 wt. % chromium, wherein the supported chromium catalyst is characterized by:
Dependencies are inferred from the claim text.