Patent US4568730A successfully refreshed from Google Patents.
US4568730A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization catalyst
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1984-08-13
•
Granted: 1986-02-04
•
Expires: 2004-08-13
Abstract
Abstract An olefin polymerization catalyst component produced by impregnating polyethylene with a pulverized solid olefin polymerization catalyst containing a Group 4b or 5b transition metal, for example a pulverized magnesium chloride containing titanium is impregnated in low molecular weight polyethylene by copulvering, then subjecting the impregnated polymer particles to shear in an inert medium at about the softening point of the polyethylene, which when used as a cocatalyst with an organoaluminum compound produces polymers of improved morphology having a more regular shape and higher bulk density than pulverized catalyst alone.
Inventors
- 👤 Victoria Graves
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:49
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S526/00; Y10S526/904; Y10S526/906
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
90 words
An olefin polymerization catalyst component prepared under anhydrous conditions by (a) impregnating a particulate solid olefin polymerization catalyst containing one or more Group 4b or 5b transition metals into solid low molecular weight polyethylene particles to form catalyst impregnated polyethylene particles said polyethylene having a softening point in the range of 90°-150° C.; (b) heating said catalyst impregnated polyethylene particles at about the softening point of said polyethylene under conditions of shear in a liquid in which said polyethylene is not soluble; and (c) recovering spheroidized catalyst impregnated polyethylene particles.
Claim 2
Dependent Claim
90 words
An olefin polymerization catalyst component prepared under anhydrous conditions by (a) impregnating a particulate solid olefin polymerization catalyst containing one or more Group 4b or 5b transition metals into solid low molecular weight polyethylene particles to form catalyst impregnated polyethylene particles said polyethylene having a softening point in the range of 90°-150° C.; (b) heating said catalyst impregnated polyethylene particles at about the softening point of said polyethylene under conditions of shear in a liquid in which said polyethylene is not soluble; and (c) recovering spheroidized catalyst impregnated polyethylene particles.
Claim 3
Dependent Claim
18 words
The olefin polymerization catalyst component according to claim 1 wherein the particulate solid comprises a magnesium compound support.
Claim 4
Dependent Claim
85 words
The olefin polymerization catalyst component according to claim 2 wherein said magnesium compound has the formula MgX 1 X 2 wherein X 1 is halogen and X 2 represents a member selected from halogen atoms, and the groups OR' in which R' is a group selected from the group consisting of alkyl groups containing 1 to 10 carbon atoms, cycloalkyl groups containing 6 to 12 carbon atoms and a phenyl group or phenyl group substituted by an alkyl group containing 1 to 4 carbon atoms.
Claim 5
Dependent Claim
17 words
The olefin polymerization catalyst component according to claim 3 wherein said magnesium compound is MgCl 2 .
Claim 6
Dependent Claim
25 words
The olefin polymerization catalyst component according to claim 2 wherein said magnesium compound is copulverized with yttrium halide, scandium halide, organic ester or combinations thereof.
Claim 7
Dependent Claim
18 words
The olefin polymerization catalyst component according to claim 5 wherein said magnesium compound is copulverized with yttrium halide.
Claim 8
Dependent Claim
18 words
The olefin polymerization catalyst component according to claim 5 wherein said magnesium compound is copulverized with scandium halide.
Claim 9
Dependent Claim
18 words
The olefin polymerization catalyst component according to claim 5 wherein said magnesium compound is copulverized with organic ester.
Claim 10
Dependent Claim
16 words
The olefin polymerization catalyst component according to claim 6 wherein said yttrium halide is yttrium chloride.
Claim 11
Dependent Claim
18 words
The olefin polymerization catalyst component according to claim 9 wherein said magnesium compound is copulverized with ethyl benzoate.
Claim 12
Dependent Claim
29 words
The olefin polymerization catalyst component according to claim 1 wherein said transition metal compounds comprise a titanium compound, a vanadium compound, or a titanium compound and a vanadium compound.
Claim 13
Dependent Claim
18 words
The olefin polymerization catalyst component according to claim 11 wherein said transition metal compounds comprise a titanium compound.
Claim 14
Dependent Claim
27 words
The olefin polymerization catalyst component according to claim 12 wherein said titanium compound is selected from halides, alkoxyhalides, alkoxides, siloxyhalides, siloxides, aromatic ring complexes or chelate compounds.
Claim 15
Dependent Claim
18 words
The olefin polymerization catalyst component according to claim 10 wherein the transition metal compounds comprise TiCl 4 .
Claim 16
Dependent Claim
38 words
The olefin polymerization catalyst component according to claim 1 wherein the particulate solid olefin polymerization catalyst containing one or more Group 4b or 5b transition metals is impregnated into said polyethylene by copulverizing said solid and said polyethylene.
Claim 17
Dependent Claim
30 words
The olefin polymerization catalyst component according to claim 1 wherein said particulate solid olefin polymerization catalyst containing one or more Group 4b or 5b transition metals is a pulverized material.
Claim 18
Dependent Claim
28 words
The olefin polymerization catalyst component according to claim 1 wherein said low molecular weight polyethylene has a number average molecular weight in the range of 900 to 2000.
Claim 19
Dependent Claim
108 words
A process for polymerizing at least one alpha olefin under conditions characteristic of Ziegler polymerization wherein the polymerization conducted in the presence of a catalyst comprising: I. An olefin polymerization catalyst component prepared under anhydrous conditions by (a) impregnating a pulverized solid olefin polymerization catalyst containing one or more Group 4b or 5b transition metals into solid polyethylene particles to form catalyst impregnated polyethylene particles; (b) heating said catalyst impregnated polyethylene particles at about the softening point of said polyethylene and under conditions of shear in a liquid in which said polyethylene is not soluble; and (c) recovering spheroidized catalyst impregnated polyethylene particles and II. an organoaluminum compound.
Claim 20
Dependent Claim
108 words
A process for polymerizing at least one alpha olefin under conditions characteristic of Ziegler polymerization wherein the polymerization conducted in the presence of a catalyst comprising: I. An olefin polymerization catalyst component prepared under anhydrous conditions by (a) impregnating a pulverized solid olefin polymerization catalyst containing one or more Group 4b or 5b transition metals into solid polyethylene particles to form catalyst impregnated polyethylene particles; (b) heating said catalyst impregnated polyethylene particles at about the softening point of said polyethylene and under conditions of shear in a liquid in which said polyethylene is not soluble; and (c) recovering spheroidized catalyst impregnated polyethylene particles and II. an organoaluminum compound.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-02-03 | 1989-08-05 | 1990-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-03 | 1993-08-05 | 1994-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-03 | 1997-08-05 | 1998-02-04 | $7700.00 | Window Closed / Lapsed |