US 11,814,456 B2
Process for the production of bimodal ethylene-based polymers having high molecular weight high density fractions
Timothy W. Gambrel, Lake Jackson, TX (US); Curvel Hypolite, Rosharon, TX (US); Daniel S. Rynearson, Lake Jackson, TX (US); Michael J. Zogg, Jr., Houston, TX (US); Kyle E. Hart, Manvel, TX (US); Michael D. Turner, Lake Jackson, TX (US); Jorge Rubalcaba, Pearland, TX (US); Pradeep Jain, Lake Jackson, TX (US); and Mehmet Demirors, Pearland, TX (US)
Assigned to Dow Global Technologies LLC, Midland, MI (US)
Appl. No. 16/973,626
Filed by Dow Global Technologies LLC, Midland, MI (US)
PCT Filed Jun. 13, 2019, PCT No. PCT/US2019/036966
§ 371(c)(1), (2) Date Dec. 9, 2020,
PCT Pub. No. WO2019/241515, PCT Pub. Date Dec. 19, 2019.
Claims priority of provisional application 62/685,536, filed on Jun. 15, 2018.
Prior Publication US 2021/0253757 A1, Aug. 19, 2021
Int. Cl. C08F 210/16 (2006.01); B01J 8/00 (2006.01); B01J 8/18 (2006.01); B01J 19/00 (2006.01); B01J 19/18 (2006.01); C08F 2/01 (2006.01); C08F 2/06 (2006.01); C08F 4/64 (2006.01); C08F 2/00 (2006.01)
CPC C08F 210/16 (2013.01) [B01J 8/008 (2013.01); B01J 8/1827 (2013.01); B01J 19/0066 (2013.01); B01J 19/1837 (2013.01); C08F 2/01 (2013.01); C08F 2/06 (2013.01); C08F 4/64193 (2013.01); B01J 2219/00033 (2013.01); C08F 2/001 (2013.01); C08F 2800/20 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A method of producing bimodal ethylene-based polymer comprising:
reacting ethylene monomer and C3-C12 α-olefin comonomer in solvent in the presence of a first catalyst in an agitated solution polymerization reactor to produce a first polymer fraction;
outputting effluent from the agitated solution polymerization reactor, wherein effluent comprises the first polymer fraction, unreacted ethylene monomer, and unreacted C3-C12 α-olefin comonomer;
adding a second catalyst to the effluent downstream of the agitated solution polymerization reactor and upstream from a non-agitated solution polymerization reactor, wherein the second catalyst facilitates further reaction of the unreacted ethylene monomer and unreacted C3-C12 α-olefin comonomer to produce a second polymer fraction having a density and melt index (I2) different from the first polymer fraction and the second catalyst and effluent mix in at least one mixer downstream from the agitated solution polymerization reactor and upstream of the non-agitated solution polymerization reactor;
passing the second catalyst, second polymer fraction, and the first polymer fraction to the non-agitated solution polymerization reactor; and
passing additional ethylene monomer, additional C3-C12 α-olefin comonomer, and solvent to the non-agitated solution polymerization reactor, wherein the additional ethylene monomer, additional C3-C12 α-olefin comonomer react in the presence of the second catalyst to produce more second polymer fraction and thereby the bimodal ethylene-based polymer, the bimodal ethylene-based polymer comprising the first polymer fraction and the second polymer fraction.