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US 2016/0355653 A1Published application
Porous Propylene Polymers
AssigneeExxonMobil Chemical Patents Inc.
InventorsMatthew W. Holtcamp, Gregory S. Day, Jian Yang, Lubin Luo, Steven D. Brown, Rohan A. Hule
Life of this patent
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Abstract
This invention relates to high porosity (≧15%) and/or low pore diameter (PD<165 μm) propylene polymers and propylene polymerization processes using single site catalyst systems with supports having high surface area (SA≧400 m2/g), low pore volume (PV≦2 mL/g), a specific mean pore diameter range (PD=1-20 nm), and high average particle size (PS≧30 μm).
Claims25
A propylene polymer comprising:
- at least 50 mol % propylene;
- a 1% Secant flexural modulus of at least 1000 MPa, determined according to ASTM D 790 (A, 1.0 mm/min);
- greater than 5 and less than 200 regio defects per 10,000 propylene units, determined by 13C NMR;
- if comonomer is present, a composition distribution breadth index (CDBI) of 50% or more;
- a matrix comprising a porosity of 15% or more and a median pore diameter of between greater than 6 and less than 160 μm, as determined by mercury intrusion porosimetry.
2 more elements
A process to polymerize propylene comprising:
- (a) contacting propylene monomer under polymerization conditions with a catalyst system, the catalyst system comprising a single site catalyst precursor compound, an activator, and a support, wherein the support has an average particle size of from 30 microns up to 200 microns, a surface area of 400 m2/g or more, a pore volume of from 0.5 to 2 mL/g, and a mean pore diameter of from 1 to 20 nm (10 to 200 Å), as determined by BET nitrogen adsorption;
- and
- (b) forming a matrix of propylene polymer comprising at least 50 mol % propylene and a porosity of 15% or more as determined by mercury intrusion porosimetry.
Dependencies are inferred from the claim text.