Borate cocatalysts for polyolefin production
AssigneeDow Global Technologies LLC
InventorsDavid M. Pearson, David S. Laitar, Cole A. Witham
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Abstract
Embodiments are directed to catalyst systems comprising a metal ligand complex procatalyst, and an activator, wherein the activator comprises an anion and a cation, the anion having a structure according to formula (I).
Claims23
A polymerization process comprising contacting ethylene and optionally one or more α-olefin monomers in a solution polymerization reactor in the presence of a catalyst system at a temperature of 120° C. to 200° C., wherein the catalyst system comprises a procatalyst and an activator, wherein the activator comprises a anion and a cation, the anion having a structure according to formula (I):
- where:
- B is boron atom;
- each R1 and each R5 is selected from-H or fluorine atom;
- each R2, R3, and R4 is selected from —H, fluorine atom, (C1-C40)hydrocarbyl, (C1-C40)heterohydrocarbyl, wherein at least three of R1, R2, R3, R4, and R5 on each individual ring are fluorine atoms;
- R6, R7, R8, R9, and R10 are independently selected from —H, fluorine atom, (C1-C40)hydrocarbyl, (C1-C40)heterohydrocarbyl, —ORC, —SiRC3, wherein RC is (C1-C20)hydrocarbyl or —H, and optionally R7 and R8 are connected to form a ring;
- wherein:
- the structure according to formula (I) has a fluorine to carbon ratio (F/C) of less than or equal to 0.83, wherein F is the total number of fluorine atoms in the structure according to formula (I) and C is the total number of carbon atoms in the structure according to formula (I).
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A process comprising:
- polymerizing ethylene and optionally one or more α-olefin monomers in a solution polymerization reactor in the presence of a catalyst system, wherein the catalyst system comprises a procatalyst and an activator, wherein the activator comprises a anion and a cation, the anion having a structure according to formula (II):
- where:
- B is boron atom;
- each R11 and each R15 is selected from —H, fluorine atom, or —CF3;
- each R12, R13, and R14 is selected from —H, fluorine atom, (C1-C40)hydrocarbyl, (C1-C40)heterohydrocarbyl, provided that:
- (1) at least three of R11, R12, R13, R14, and R15 on each individual ring are fluorine atoms or (2) at least one of R11, R12, R13, R14, and R15 on each individual ring is —CF3;
- R16, R17, R18, R19, and R20 are independently selected from —H, fluorine atom, —CF3, (C1-C40)hydrocarbyl, (C1-C40)heterohydrocarbyl, —ORC, —SiRC3, and optionally R17 and R18 are connected to form a ring;
- where RC is —H or (C1-C20)hydrocarbyl;
- wherein the structure according to formula (II) does not include:
- obtaining a produced polymer;
- and
- heating the produced polymer to a thermal decomposition temperature for at least 1 minute.
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An activator selected from:
Dependencies are inferred from the claim text.