EP0231102A2
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EP
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Catalyst composition for polymerizing alpha-olefins
Assignee: Mobil Oil AS
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Filing: 1987-01-22
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Granted: —
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Expires: 2007-01-22
Abstract
Abstract A catalyst composition for polymerizing alpha-olefins is prepared by reacting a transition metal compound, e.g., titanium, with trimethylaluminum catalyst activator. In a preferred embodiment, the catalyst is supported on a porous refractory support and is prepared by additionally reacting a magnesium compound or an organomagnesium composition with the support. Also disclosed is a process for polymerizing alpha-olefins in the presence of the catalyst of the invention. The polymer products have narrow molecular weight distribution, higher bulk density and produce films of greater strength than polymers prepared with similar catalysts utilizing different alkyl-aluminum activators, e.g., triethylaluminum and tri-isobutylaluminum.
Inventors
- 👤 Robert Olds Hagerty
- 👤 Richard Otto Mohring
- 👤 Luanne Mary Allen
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 18:28
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
57 words
A catalyst composition for polymerizing alpha-olefins comprising (1) at least one magnesium compound having the empirical formula where R and R' are the same or different and are C l -C 12 hydrocarbyl groups, provided that R' may also be a halogen, and n is 0, 1 or 2; (2) a transition metal compound; and (3) trimethylaluminum.
Claim 2
Dependent Claim
57 words
A catalyst composition for polymerizing alpha-olefins comprising (1) at least one magnesium compound having the empirical formula where R and R' are the same or different and are C l -C 12 hydrocarbyl groups, provided that R' may also be a halogen, and n is 0, 1 or 2; (2) a transition metal compound; and (3) trimethylaluminum.
Claim 3
Dependent Claim
18 words
The catalyst composition of claim 2 which is deposited on a solid, porous carrier having reactive OH groups.
Claim 4
Dependent Claim
18 words
The catalyst composition of claim 1 or 2 wherein the magnesium compound is ethylmagnesium chloride or magnesium chloride.
Claim 5
Dependent Claim
21 words
The catalyst composition of claim 1, 2 or 3 wherein the transition metal compound is TiCl 3 or TiCl 4 .
Claim 6
Dependent Claim
37 words
The catalyst composition of claim 1, 2, 3 or 4 wherein the amount of trimethylaluminum present is such that the polymer formed with the catalyst composition comprises about 15 to about 300 parts per million of trimethylaluminum.
Claim 7
Dependent Claim
25 words
6 . The catalyst composition of claim 4 wherein the number of moles of trimethylaluminum per gram atom of titanium is from 6 to 80.
Claim 8
Dependent Claim
26 words
A process for preparing an alpha-olefin polymerization catalyst composition comprising (A) forming a catalyst precursor and (B) contacting the precursor with a catalyst activator comprising trimethylaluminum.
Claim 9
Dependent Claim
26 words
A process for preparing an alpha-olefin polymerization catalyst composition comprising (A) forming a catalyst precursor and (B) contacting the precursor with a catalyst activator comprising trimethylaluminum.
Claim 10
Dependent Claim
76 words
The process of claim 7 wherein the precursor is prepared by (1) contacting at least one magnesium compound having the empirical formula where R and R' are the same or different and are C 1 -C 12 hydrocarbyl groups, provided that R' may also be a halogen, and n is 0, 1 or 2, with a solid, porous carrier comprising reactive OH groups; and (2) contacting the product of step (1) with a transition metal compound.
Claim 11
Dependent Claim
14 words
The process of claim 8 wherein the transition metal compound is a titanium compound.
Claim 12
Dependent Claim
31 words
The process of claims 8 or 9 wherein the number of moles of the magnesium compound is in excess of the number of moles of the OH groups on the carrier.
Claim 13
Dependent Claim
34 words
The process of claims 8, 9 or 10 wherein the carrier is silica, the magnesium compound is ethylmagnesium chloride or magnesium chloride and the transition metal compound is TiCl 3 or TiCl 4 .
Claim 14
Dependent Claim
43 words
The process of claims 8, 9, 10 or 11 wherein, in step (1), the carrier is silica and the ratio of the number of moles of the magnesium compound to the number of moles of the OH groups on the silica is 1.1-3.5:1.
Claim 15
Dependent Claim
36 words
The process of claims 7, 8, 9, 10, 11 or 12 wherein the amount of the trimethylaluminum used is such that the concentration thereof in the polymer product is about 15 to 300 parts per million.
Claim 16
Dependent Claim
30 words
The process of claims 7, 8, 9, 10, 11, 12 or 13 wherein the catalyst precursor is activated by adding the precursor and the activator separately to the polymerization medium.
Claim 17
Dependent Claim
29 words
The process of claims 7, 8, 9, 10, 11, 12 or 13 wherein the precursor and the activator are combined prior to the introduction thereof into the polymerization medium.
Claim 18
Dependent Claim
29 words
A process of preparing polyolefin comprising polymerizing at least one C2-C10 alpha-olefin in the presence of the catalyst composition according to claims 1, 2, 3, 4, 5, or 6.
Claim 19
Dependent Claim
37 words
1 7 . The process of claim 16 wherein ethylene and at least one C 3 -C 10 alpha-olefin are polymerized to form a linear low density polyethylene having a density of 0.940 gm/cm 3 or less.
Claim 20
Dependent Claim
16 words
The process of claim 17 whrein the C 3 -C 10 alpha-olefin is 1-butene or 1-hexene.
Claim 21
Dependent Claim
67 words
A linear low density copolymer of ethylene and at least one C 3 -C 10 alpha-olefin, the copolymer having a density of 0. 940 gm/cm or less and being prepared by copolymerizing ethylene and at least one C 3 -C 10 alpha-olefin in the presence of the catalyst composition according to claim 1, 2, 3, 4, 5, or 6, the copolymer having a narrow molecular weight distribution.
Claim 22
Dependent Claim
15 words
The.copolymer of claim 19 wherein the C 3 -C 10 alpha-olefin is 1-butene or 1-hexene.
Claim 23
Dependent Claim
39 words
The copolymer of claim 20 having a melt flow ratio ranging from about 24 to about 29, a density of about 0.914 to about 0.926 gm/cm 3 and an 1 2 melt index of about 0.9 to about 4.0.
References Cited (Backward Citations)
No citation records indexed.
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