Process for the preparation of polyethylenes
AssigneeSabic Global Technologies B.V.
InventorsLidong Li, Salah Al Hubish
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Abstract
The present invention relates to a process for the production of a polyethylene by polymerisation of a reaction mixture comprising ethylene in the presence a catalyst system and an antistatic agent according to formula I: (I) wherein R1, R2 and R3 stand for a moiety according to formula II or a hydrocarbon moiety having 1 to 20 carbon atoms (II) wherein each of R4, R5 and R6 may be the same or different, and wherein each of R4, R5 and R6 is a hydrocarbon moiety having 1 to 10 carbon atoms, and wherein at least one of R1, R2 and R3 is a moiety according to formula II. Such process allows for the reduction of sheeting in the polymerisation reactor without compromising the polymerisation reaction kinetics.
Claims19
Process for the production of a polyethylene comprising polymerizing a reaction mixture comprising ethylene in the presence of a catalyst system and an antistatic agent according to formula I:
- wherein R1, R2 and R3 stand for a moiety according to formula II or a hydrocarbon moiety having 1 to 20 carbon atoms
- wherein each of R4, R5 and R6 is the same or different, and wherein each of R4, R5 and R6 is a hydrocarbon moiety having 1 to 10 carbon atoms, and wherein at least two of R1, R2 and R3 are each a moiety according to formula II.
Process for the production of a polyethylene comprising polymerizing a reaction mixture comprising ethylene in the presence of a catalyst system and an antistatic agent according to formula I:
- wherein R1, R2 and R3 stand for a moiety according to formula II or a hydrocarbon moiety having 1 to 20 carbon atoms
- wherein each of R4, R5 and R6 is the same or different, and wherein each of R4, R5 and R6 is a hydrocarbon moiety having 1 to 10 carbon atoms, and wherein at least one of R1, R2 and R3 is a moiety according to formula II,
- wherein the catalyst system is a metallocene-type catalyst system, and
- the process is continuously operated by providing to a reactor a continuous supply of a reactant feed comprising ethylene, a continuous supply of the metallocene-type catalyst system, and a continuous supply of the antistatic agent, such that the molar ratio of the metallocene complex in the metallocene-type catalyst system to the antistatic agent is maintained in the range of ≥0.01 and ≤100, and wherein a product stream comprising the polyethylene produced in the polymerisation reactor is withdrawn continuously from the reactor.
Dependencies are inferred from the claim text.