US 11,939,417 B2
Ziegler-Natta catalyst with an electron donor compound for increasing polymer molecular weight
Linfeng Chen, Missouri City, TX (US); Mingzhe Yu, Midland, MI (US); Mehmet Demirors, Pearland, TX (US); Andrew T. Heitsch, Angleton, TX (US); Jeffrey A. Sims, Lake Jackson, TX (US); David Gordon Barton, Midland, MI (US); Kurt F. Hirsekorn, Sugar Land, TX (US); and Peter N. Nickias, Midland, MI (US)
Assigned to Dow Global Technologies LLC, Midland, MI (US)
Appl. No. 17/056,473
Filed by Dow Global Technologies LLC, Midland, MI (US)
PCT Filed May 29, 2019, PCT No. PCT/US2019/034299
§ 371(c)(1), (2) Date Nov. 18, 2020,
PCT Pub. No. WO2019/231986, PCT Pub. Date Dec. 5, 2019.
Claims priority of provisional application 62/679,263, filed on Jun. 1, 2018.
Prior Publication US 2021/0221924 A1, Jul. 22, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. C08F 4/655 (2006.01); C08F 2/06 (2006.01); C08F 4/685 (2006.01); C08F 10/02 (2006.01)
CPC C08F 4/6557 (2013.01) [C08F 2/06 (2013.01); C08F 4/685 (2013.01); C08F 10/02 (2013.01)] 17 Claims
 
1. A heterogeneous procatalyst comprising:
a titanium species, wherein the titanium species is TiCl4-c(OR3), or TiCl3-d(OR3)d, wherein R3 is (C1-C20)hydrocarbyl, c is 0, 1, 2, 3, or 4, and d is 0, 1, 2, or 3;
a preformed MgCl2 support with a specific surface area of at least 100 m2/g;
a chlorinating agent having a structural formula Al(Cl)x(R1)3-x or Si(Cl)y(R1)4-y, where:
R1 is a (C1-C30) hydrocarbyl;
x is 1, 2, or 3; and
y is 1, 2, 3, or 4; and
a metal-ligand complex having a structural formula (L)nM(Y)m(XR2)b, where:
M is a metal cation;
each L is a neutral ligand or (═O);
each Y is a halide or (C1-C20)alkyl;
each XR2 is an anionic ligand in which X is a heteroatom or a heteroatom-containing functional group and R2 is (C1-C20)hydrocarbyl or (C1-C20)heterohydrocarbyl;
n is 0, 1, or 2;
m is 0, 1, 2, 3, or 4;
b is 1, 2, 3, 4, 5, or 6; and
the metal-ligand complex is overall charge neutral;
wherein the molar ratio of the total amount of chlorine in the chlorinating agent to the sum of the amounts of OR3 and XR2 in the heterogeneous procatalyst is from 0.33 to 1.45.