Heterocyclic organic compounds as electron donors for polyolefin catalysts
AssigneeFormosa Plastics Corporation, U.S.A.
InventorsYiqun Fang, Demin Xu, Ming-Yung Lee
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Abstract
Heterocyclic organic compounds are used as electron donors in conjunction with solid Ziegler-Natta type catalyst in processes in which polyolefins such as polypropylene are produced. The electron donors may be used in the preparation of solid catalyst system, thus serving as “internal electron donors”, or they may be employed during or prior to polymerization with the co-catalyst as “external electron donors”.
Claims26
A solid catalyst component for the polymerization or co-polymerization of alpha-olefins comprising titanium, magnesium, halogen and at least one internal electron donor selected from heterocyclic organic compounds of:
- wherein L is represented by:
- wherein A and A1, which may be identical or different, is a carbon atom or a heteroatom selected from the group consisting of Si, N, B, and P;
- wherein Q and Q1, which may be identical or different, is a heteroatom selected from the group consisting of O, N, S, and P;
- wherein R1, R4, R5, and R8, which may be identical or different, are aliphatic, alicyclic or aromatic groups;
- wherein the subscripts p, q, i, and j are independently selected from 0 or 1;
- wherein the bonds directly connected to Q, A, Q1, and A1, are independently a single bond or a double bond;
- wherein R, R2, R3, R6, and R7, which may be identical or different, are bridging groups with a backbone chain length being 1-6 atoms for R and 0-6 atoms for R2, R3, R6, and R7, wherein the resultant ring structure is a three to eight-membered ring.
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-olefin comprising titanium, magnesium, halogen and at least one internal electron donor selected from heterocyclic organic compounds of:
- wherein L is represented by:
- wherein A and A1, which may be identical or different, is a carbon atom or a heteroatom selected from the group consisting of Si, N, B, and P;
- wherein Q and Q1, which may be identical or different, is a heteroatom selected from the group consisting of O, N, S, and P;
- wherein R1, R4, R5, and R8, which may be identical or different, are aliphatic, alicyclic or aromatic groups;
- wherein the subscripts p, q, i, and j are independently selected from 0 or 1;
- wherein the bonds directly connected to Q, A, Q1, and A1, are independently a single bond or a double bond;
- wherein R, R2, R3, R6, and R7, which may be identical or different, are bridging groups with a backbone chain length being 1-6 atoms for R and 0-6 atoms for R2, R3, R6, and R7, wherein the resultant ring structure is a three to eight-membered ring;
- (2) a co-catalyst component.
A method for polymerizing alpha-olefins, comprising polymerizing alpha-olefins in the presence of:
- (1) a solid catalyst component for the polymerization or co-polymerization of alpha-olefin comprising titanium, magnesium, halogen and at least one internal electron donor selected from heterocyclic organic compounds:
- wherein L is represented by:
- wherein A and A1, which may be identical or different, is a carbon atom or a heteroatom selected from the group consisting of Si, N, B, and P;
- wherein Q and Q1, which may be identical or different, is a heteroatom selected from the group consisting of O, N, S, and P;
- wherein R1, R4, R5, and R8, which may be identical or different, are aliphatic, alicyclic or aromatic groups;
- wherein the subscripts p, q, i, and j are independently selected from 0 or 1;
- wherein the bonds directly connected to Q, A, Q1, and A1, are independently a single bond or a double bond;
- wherein R, R2, R3, R6, and R7, which may be identical or different, are bridging groups with a backbone chain length being 1-6 atoms for R and 0-6 atoms for R2, R3, R6, and R7, wherein the resultant ring structure is a three to eight-membered ring;
- (2) a co-catalyst component.
Dependencies are inferred from the claim text.