Ethylene-styrene copolymers and phenol-triazole type complexes, catalysts, and processes for polymerizing
View Patent ↗Metal-ligand complexes that are useful as precursors to catalysts for the polymerization of olefins are provided. Certain of the catalysts are particularly effective at polymerizing ethylene and styrene into copolymers having novel properties, including a low molecular weight and close comparison between vinyl and methyl end groups.
1. A copolymer of ethylene and styrene having a molecular weight of less than about 10,000, said copolymer having at least one end that is a vinyl group and at least a second end that is a methyl group and wherein the ratio of said methyl to said vinyl is about 0.8:1 to about 1:0.8.
2. The copolymer of claim 1 , wherein said molecular weight is less than about 5,000.
3. The copolymer of claim 1 , wherein said molecular weight is less than about 3,000.
4. The copolymer of claim 1 , wherein said molecular weight is less than about 1,000.
5. The copolymer of claim 1 , wherein said molecular weight is a weight average molecular weight.
6. The copolymer of claim 1 , wherein said molecular weight is a number average molecular weight.
7. The copolymer of claim 1 , wherein said ratio is about 0.9:1 to about 1:0.9.
8. A compound characterized by either of the general formulas:
wherein h, i and j are each a number greater than or equal to 1 and the molecular weight of said compound is less than about 10,000.
9. The compound of claim 8 , wherein said molecular weight is less than about 5,000.
10. The compound of claim 8 , wherein said molecular weight is less than about 3,000.
11. The compound of claim 8 , wherein said molecular weight is less than about 1,000.
12. The compound of claim 8 , wherein (h+i+1)*j)+2 in a bulk sample is between 5 and 100.
13. The compound of claim 8 , wherein (h+i+1)*j)+2 in a bulk sample is between 5 and 50.
14. The compound of claim 8 , wherein (h+i+1)*j)+2 in a bulk sample is between 5 and 25.
15. The compound of claim 8 , wherein j is a number between 1 and 10.
16. The compound of claim 8 , wherein j is a number between 1 and 5.
17. The compound of claim 8 , wherein j is a number between 1 and 3.
18. The compound of claim 8 , wherein j is a number between 2 and 10.
19. The compound of claim 8 , wherein j is a number between 2 and 5.
20. The compound of claim 8 , wherein said compound is a copolymer is produced by polymerization of ethylene and styrene with the aid of a catalyst that comprises Hf, Zr or Ti.
21. The compound of claim 20 , wherein said catalyst is formed from a composition comprising a ligand and metal precursor, wherein said ligand is characterized by the following formula:
wherein X 1 and X 2 are N, and X 3 , X 4 , and X 5 are independently selected from the group consisting of N and CR 15 , where R 15 is selected from the group consisting of hydrogen, alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, heterocycloalkyl, substituted heterocycloalkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, alkoxy, aryloxy, silyl, boryl, phosphino, amino, thio, seleno, and combinations thereof, provided that at least one and not more than two of X 3 , X 4 , and X 5 are N; optionally, X 3 and X 4 may be joined to form a fused ring system having up to 50 atoms, not counting hydrogen atoms; and
R 1 , R 2 , R 3 and R 4 are independently selected from the group consisting of hydrogen, alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, heteroalkyl, substituted heteroalkyl, heterocycloalkyl, substituted heterocycloalkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, alkoxy, aryloxy, halo, silyl, boryl, phosphino, amino, thio, seleno, nitro, and combinations thereof, with the exception that R 1 may not be hydrogen, and optionally two or more of R 1 , R 2 , R 3 and R 4 may be joined to form a fused ring system having up to 50 atoms, not counting hydrogen atoms; and
wherein said metal precursor comprises a group 4 metal.