Silica supports with high aluminoxane loading capability
AssigneeExxonMobil Chemical Patents Inc.
InventorsLubin Luo, Anupriya Jain, Xuan Ye
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Abstract
Olefin polymerization catalyst systems having high aluminoxane loading and methods for making and using them are disclosed herein.
Claims35
An olefin polymerization catalyst system comprising a catalyst component and a silica supported aluminoxane, wherein the silica supported aluminoxane comprises silica gel particles having:
- a. an average surface area of from about 400 to 800 m2/g;
- b. an average pore diameter of from about 60 to 80 Angstrom;
- and
- c. at least 20% of the incremental pore volume comprised of pores having a pore diameter smaller than about 70 Angstrom;
- wherein the aluminoxane loading on the support is greater than 12 to 20 mmol Al/g silica.
An olefin polymerization catalyst system comprising a catalyst component and a silica supported aluminoxane, wherein the silica supported aluminoxane comprises silica gel particles having:
- a. an average surface area of from about 400 to 800 m2/g;
- b. an average pore diameter of from about 60 to 80 Angstrom;
- and
- c. at least 20% of the incremental pore volume comprised of pores having a pore diameter smaller than about 70 Angstrom;
- wherein the aluminoxane loading on the support is greater than 12 to 20 mmol Al/g silica;
- and
- the silica supported aluminoxane is prepared by a method comprising contacting:
- a. a silica support;
- and
- b. an aluminoxane;
- wherein when, during contacting (a) and (b), the temperature does not exceed 40° C., the porous silica support obtains a first aluminoxane loading, and when the temperature is 40° C. or greater, the porous silica support obtains a second aluminoxane loading;
- and the second aluminoxane loading is at least about 1.0 mmol Al/g silica or greater than the first aluminoxane loading, and the silica support comprises greater than 12 to 20 mmol Aug silica.
An olefin polymerization catalyst system comprising a catalyst component and a silica supported aluminoxane, wherein the silica supported aluminoxane comprises silica gel particles having:
- a. an average surface area of from about 400 to 800 m2/g;
- b. an average pore diameter of from about 60 to 80 Angstrom;
- and
- c. at least 20% of the incremental pore volume comprised of pores having a pore diameter smaller than about 70 Angstrom;
- wherein the aluminoxane loading on the support is greater than 12 to 20 mmol Al/g silica;
- and
- the silica supported aluminoxane is prepared by a method comprising contacting:
- a. a silica support;
- and
- b. an aluminoxane;
- wherein when, during contacting (a) and (b), the temperature does not exceed 40° C., the porous silica support obtains a first aluminoxane loading, and when the temperature is 40° C. or greater, the porous silica support obtains a second aluminoxane loading;
- and the second aluminoxane loading is at least about 1.0 mmol Al/g silica or greater than the first aluminoxane loading, and the silica support comprises greater than 12 to 20 mmol Al/g silica;
- and
- further wherein the silica supported aluminoxane is further contacted with the olefin catalyst component.
An olefin polymerization catalyst system comprising a catalyst component and a silica supported aluminoxane, wherein the silica supported aluminoxane comprises silica gel particles having:
- a. an average surface area of from about 400 to 800 m2/g;
- b. an average pore diameter of from about 60 to 80 Angstrom;
- and
- c. at least 20% of the incremental pore volume comprised of pores having a pore diameter smaller than about 70 Angstrom;
- wherein the aluminoxane loading on the support is greater than 12 to 20 mmol Al/g silica;
- and
- the silica supported aluminoxane is prepared by a method comprising contacting:
- a. a silica support;
- and
- b. an aluminoxane;
- wherein when, during contacting (a) and (b), the temperature is 40° C. or greater.
Dependencies are inferred from the claim text.