Non-phthalate compounds as electron donors for polyolefin catalysts
AssigneeFormosa Plastics Corporation, U.S.A.
InventorsDemin Xu, Lei Zhang
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Abstract
Non-phthalate compounds having a structure represented by the general formula and a method for using same are provided as electron donors in the Ziegler-Natta type catalyst system for the homopolymerization or copolymerization of alpha olefins. The non-phthalate compounds may be used in the preparation of the solid catalyst component, thus serving as “internal electron donors”, or employed during or prior to polymerization as “external electron donors,” and therefore they can be used to prepare phthalate-free polyolefins.
Claims38
A solid Ziegler-Natta type catalyst component for the polymerization or copolymerization of alpha olefins, comprising magnesium, titanium, halogen, and electron donors;
- wherein the electron donors comprise at least one non-phthalate compound represented by the formula:
- wherein R1, R2, R3, R4, R5, R6 and X are independently selected from the groups consisting of aliphatic hydrocarbons, alicyclic hydrocarbons, aromatic hydrocarbons, and polycyclic hydrocarbons, and
- wherein the subscripts m, n, p and t, y, z are independently selected from 1 to 3, and
- wherein L and Q are independently selected functional groups containing at least one atom selected from O, S, N, and P atoms.
A catalyst system for the polymerization or co-polymerization of alpha-olefins comprising:
- (1) a solid catalyst component for the polymerization or co-polymerization of alpha-olefins comprising titanium, magnesium, halogen, and at least one non-phthalate compound represented by the formula:
- wherein R1, R2, R3, R4, R5, R6 and X are independently selected from the groups consisting of aliphatic hydrocarbons, alicyclic hydrocarbons, aromatic hydrocarbons, and polycyclic hydrocarbons,
- wherein the subscripts m, n. p and t, y, z are independently selected from 1 to 3, and
- wherein L and Q are independently selected functional groups containing at least one atom selected from O, S, N, and P atoms;
- and
- (2) a co-catalyst component.
A method for the polymerization or copolymerization of alpha-olefins, comprising:
- (1) providing a catalyst system for the polymerization or co-polymerization of alpha-olefins comprising a solid catalyst component comprising titanium, magnesium, halogen, and at least one non-phthalate compound represented by the formula:
- wherein R1, R2, R3, R4, R5, R6 and X are independently selected from the groups consisting of aliphatic hydrocarbons, alicyclic hydrocarbons, aromatic hydrocarbons, and polycyclic hydrocarbons,
- wherein the subscripts m, n, p and t, y, z are independently selected from 1 to 3, and
- wherein L and Q are independently selected functional groups containing at least one atom selected from O, S, N, and P atoms;
- and
- (2) polymerizing alpha-olefins in the presence of the catalyst system.
Dependencies are inferred from the claim text.