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US 2016/0355619 A1Published application
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.
Claims25
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.
1 more element
A method for making a silica supported aluminoxane 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.
3 more elements
A method for making a silica supported aluminoxane comprising contacting:
- a. a silica support;
- and
- b. an aluminoxane;
- wherein during contacting (a) and (b) the temperature is 40° C. or greater, and
- wherein the aluminoxane loading on the support is greater than about 9.5 mmol Al/g silica.
2 more elements
Dependencies are inferred from the claim text.