Back to results
US 2026/0103548 A1Published application
Process for producing polypropylene-ethylene random copolymer resin with sustainable reactor operability
AssigneeW.R. Grace & Co.-Conn.
InventorsPing Cai, Matthew J. Fedec
Life of this patent
Estimating the term…
Abstract
A gas-phase polymerization process is disclosed for producing polypropylene random copolymers with excellent reactor operability and/or particle morphology. The polypropylene random copolymer is produced while maintaining the partial pressure of the propylene monomer within controlled limits based upon the amount of comonomer present and the operating temperature.
Claims16
A process for producing a polypropylene-ethylene random copolymer in a reactor comprising:
- feeding a gaseous medium into a reactor vessel containing a bed of catalytically active polyolefin particles, the gaseous medium comprising propylene gas, ethylene comonomer, optionally hydrogen, and at least one inert gas;
- wherein the propylene gas is maintained in the reactor vessel at a partial pressure according to the following relationship:
- 0.9
- *
- (
- 4.31
- -
- 0.301
- E
- t
- -
- 0.015
- T
- )
- <
- PP
- propylene
- <
- 1.1
- *
- (
- 4.31
- -
- 0.301
- E
- t
- -
- 0.015
- T
- )
- wherein:
- Et is the ethylene comonomer content in the copolymer (in wt %);
- T is the bed temperature (in ° C.);
- and
- PPpropylene is the partial pressure of propylene (in MPa).
32 more elements
Dependencies are inferred from the claim text.