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US 10,280,235 B2Granted
Catalyst system containing high surface area supports and sequential polymerization to produce heterophasic polymers
AssigneeExxonMobil Chemical Patents Inc.
InventorLubin Luo
Life of this patent
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Abstract
This invention relates to propylene polymers having multimodal molecular weight distribution and propylene polymerization processes using single site catalyst systems with supports having multimodal particle size distribution comprising one mode peaked at particle size of 3-70 μm, and another mode peaked at particle size of 70-200 μm, the support also having an average particle size of more than 30 μm up to 200 μm and a specific surface area of 400-800 m2/g.
Claims33
A catalyst system for making polyolefinic copolymers, comprising:
- (a) a single site catalyst precursor compound;
- (b) an activator;
- and
- (c) a support having:
- A) an average particle size of more than 30 μm up to 200 μm;
- B) a specific surface area of 400 to 800 m2/g;
- C) an average pore diameter of 60 to 200 Angstrom;
- D) 10 to 90 wt % of support particles having a particle size of 3 to 70 μm and 90 to 10 wt % of support particles having a particle size of greater than 70 to 200 μm, based upon the weight of the support;
- and
- E) a multimodal particle size distribution comprising a first peak or inflection point having a peak particle size of 3 to 70 μm and a second peak or inflection point having a peak particle size of greater than 70 to 200 μm.
7 more elements
A process of making a catalyst system, the process comprising:
- (a) providing a support having:
- A) an average particle size of more than 30 μm up to 200 μm;
- B) a specific surface area of 400 to 800 m2/g;
- C) an average pore diameter of 60 to 200 Angstrom;
- D) 10 to 90 wt % of support particles having a particle size of 3 to 70 μm and 90 to 10 wt % of support particles having a particle size of greater than 70 to 200 μm, based upon the weight of the support;
- and
- E) a multimodal particle size distribution comprising a first peak or inflection point having a peak particle size of 3 to 70 μm and a second peak or inflection point having a peak particle size of greater than 70 to 200 μm;
- (b) contacting activator and the support to form a supported activator;
- and
- (c) contacting the supported activator with a single site catalyst precursor compound to form the catalyst system.
7 more elements
Dependencies are inferred from the claim text.