US4562170A
Expired / Lapsed
US
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Polymerization catalyst
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1984-09-04
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Granted: 1985-12-31
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Expires: 2004-09-04
Abstract
Abstract An olefin polymerization catalyst produced by treating a inert porous support material preferably a hydrated high surface area silica support having 1.00 to 1.50 hydroxyls per gram of silica with the reaction product of an organomagnesium compound and first a hafnium compound then a halogenator and tetravalent titanium compound, which when used as a cocatalyst with an organoaluminum compound produces polymers having broad molecular weight distribution.
Inventors
- 👤 Victoria Graves
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:56
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
75 words
A supported olefin polymerization catalyst prepared under anhydrous conditions by the steps of: (1) sequentially (a) preparing a slurry of inert particulate support material, (b) adding to said slurry a solution of an organomagnesium compound, (c) adding to said slurry and reacting a solution of hafnium compound, and (2) thereafter (d) adding to said slurry and reacting a halogenator, (e) adding to said lsurry and reacting a tetravalent titanium compound and (f) recovering solid catalyst.
Claim 2
Dependent Claim
75 words
A supported olefin polymerization catalyst prepared under anhydrous conditions by the steps of: (1) sequentially (a) preparing a slurry of inert particulate support material, (b) adding to said slurry a solution of an organomagnesium compound, (c) adding to said slurry and reacting a solution of hafnium compound, and (2) thereafter (d) adding to said slurry and reacting a halogenator, (e) adding to said lsurry and reacting a tetravalent titanium compound and (f) recovering solid catalyst.
Claim 3
Dependent Claim
19 words
The catalyst component according to claim 1 wherein said inert particulate support material is dehydrated high surface area silica.
Claim 4
Dependent Claim
21 words
The catalyst according to claim 2 wherein said silica has from about 1.00 to 1.50 millimoles OH - /gram of silica.
Claim 5
Dependent Claim
14 words
The catalyst according to claim 1 wherein said organomagnesium compound is a dihydrocarbylamgnesium compound.
Claim 6
Dependent Claim
11 words
The catalyst according to claim 4 wherein said dihydrocarbyl is dialkyl.
Claim 7
Dependent Claim
11 words
The catalyst according to claim 4 wherein said dihydrocarbyl is diaryl.
Claim 8
Dependent Claim
28 words
The catalyst according to claim 4 wherein said organomagnesium compound is n-butyl-sec-butyl magnesium, diisopropyl magnesium, di-n-hexyl magnesium, isopropyl-n-butyl magnesium, ethyl-n-hexyl magnesium, ethyl-n-butyl magnesium, di-n-octyl magnesium or mixtures thereof.
Claim 9
Dependent Claim
17 words
The catalyst according to claim 4 wherein said organomagnesium compound is diphenylmagnesium, dibenzylmagnesium, ditolylmagnesium or mixtures thereof.
Claim 10
Dependent Claim
13 words
The catalyst according to claim 2 wherein said organomagnesium compound is ethyl-n-butyl magnesium.
Claim 11
Dependent Claim
19 words
The catalyst according to claim 1 wherein said hafnium compound is a halide alkoxyhalide, alkoxide, chelate or mixture thereof.
Claim 12
Dependent Claim
63 words
The catalyst according to claim 10 wherein said hafnium compound is represented by the empirical formula Hf(OR) x X y , wherein R is independently a hydrocarbyl group having from 1 to about 20 carbon atoms, each X is independently chlorine or bromine, and x and y independently have values from zero to 4 with the value of x plus y being 4.
Claim 13
Dependent Claim
13 words
The catalyst according to claim 9 wherein said hafnium compound is di(2-ethyl hexoxy)dichlorohafnium.
Claim 14
Dependent Claim
33 words
The catalyst according to claim 1 wherein said halogenator is a chloride, bromide or fluoride of a metal from Group 3a, 4a, or 5a of the Periodic Table of Elements or mixtures thereof.
Claim 15
Dependent Claim
21 words
The catalyst according to claim 13 wherein said metal is B, Si, Ge, Sn, P, Sb or Bi or mixtures thereof.
Claim 16
Dependent Claim
12 words
The catalyst according to claim 14 wherein said halogenator is a chloride.
Claim 17
Dependent Claim
11 words
The catalyst according to claim 15 wherein said metal is B.
Claim 18
Dependent Claim
13 words
The catalyst according to claim 12 wherein said halogenator is BCl 3 .
Claim 19
Dependent Claim
25 words
The catalyst according to claim 1 wherein said tetravalent titanium compound is a halide, alkoxyhalide, alkoxide, siloxyhalide, siloxide, aromatic ring complex, chelate or mixture thereof.
Claim 20
Dependent Claim
15 words
The catalyst according to claim 17 wherein said tetravalent titanium compound is TiCl 4 .
Claim 21
Dependent Claim
31 words
The catalyst according to claim 1 wherein the atomic ratio of Mg:Hf is from about 1:1 to about 14:1 and of Hf to Ti is from about 0.2:1 to about 10:1.
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) | 1988-12-30 | 1989-07-01 | 1989-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-30 | 1993-07-01 | 1993-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-30 | 1997-07-01 | 1997-12-31 | $7700.00 | Window Closed / Lapsed |