US4252927A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for polymerizing 1-olefins with a chromium-containing catalyst and a modifier comprising a trihydrocarbyl aluminum and an α-ω
Assignee: BP Chemicals Ltd
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Filing: 1979-08-15
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Granted: 1981-02-24
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Expires: 1999-08-15
Abstract
Abstract Process for polymerizing ethylene or mixtures of ethylene with up to 40 weight % of other 1-olefin(s) by contacting the monomer with a catalyst (A) in the presence of a catalyst modifier (B), catalyst (A) being prepared by supporting chromium trioxide, or a chromium compound calcinable thereto, on a refractory oxide support material and heat activating, catalyst modifier (B) comprising (1) a trihydrocarbyl aluminum compound and (2) an α, ω-aliphatic diene containing a chain of at least 6 carbon atoms. The refractory oxide is preferably silica, alumina, zirconia, thoria or silica-alumina. The trihydrocarbyl aluminum compound is suitably an alkyl, aryl or alkaryl aluminum. The α,ω-diene is peferably 1,5-hexadiene or 1,7-octadiene. The polymerization is preferably carried out under particle form process conditions in a fluid medium.
Inventors
- 👤 Paul L. Eve
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:51
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S526/00; Y10S526/903
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
137 words
A process for polymerizing ethylene or mixtures of ethylene together with up to 40 wt. % based on the total 1-olefin content of one or more other 1-olefins copolymerizable therewith comprising contacting the 1-olefin(s) under polymerization conditions with a catalyst (A) in the presence of a catalyst modifier (B), said catalyst (A) having been prepared by supporting chromium oxide, or a chromium compound calcinable thereto, on a refractory oxide support material and heating to a temperature at least sufficient to produce an active catalyst, and said catalyst modifier (B) comprising (1) from about 0.1-20 moles per gram atom of chromium in the catalyst of a trihydrocarbyl aluminum compound and (2) from about 10 to 5000 moles per gram atom of chromium in the catalyst of an α,ω-aliphatic diene containing a chain of at least 6 carbon atoms.
Claim 2
Dependent Claim
137 words
A process for polymerizing ethylene or mixtures of ethylene together with up to 40 wt. % based on the total 1-olefin content of one or more other 1-olefins copolymerizable therewith comprising contacting the 1-olefin(s) under polymerization conditions with a catalyst (A) in the presence of a catalyst modifier (B), said catalyst (A) having been prepared by supporting chromium oxide, or a chromium compound calcinable thereto, on a refractory oxide support material and heating to a temperature at least sufficient to produce an active catalyst, and said catalyst modifier (B) comprising (1) from about 0.1-20 moles per gram atom of chromium in the catalyst of a trihydrocarbyl aluminum compound and (2) from about 10 to 5000 moles per gram atom of chromium in the catalyst of an α,ω-aliphatic diene containing a chain of at least 6 carbon atoms.
Claim 3
Dependent Claim
13 words
A process as claimed in claim 1 wherein the refractory oxide is silica.
Claim 4
Dependent Claim
23 words
A process as claimed in claim 1 wherein the catalyst (A) is activated at a temperature in the range 400° to 900° C.
Claim 5
Dependent Claim
19 words
A process as claimed in claim 1 wherein the hydrocarbyl groups of the trihydrocarbyl aluminum compound are alkyl groups.
Claim 6
Dependent Claim
31 words
A process as claimed in claim 1 wherein the quantity of trihydrocarbyl aluminum compound employed is in the range 0.5 to 10 moles per gram atom of chromium in the catalyst.
Claim 7
Dependent Claim
28 words
A process as claimed in claim 1 wherein the quantity of trihydrocarbyl aluminum compound employed is in the range 0.04 to 2 millimoles per gram of catalyst (A).
Claim 8
Dependent Claim
14 words
A process as claimed in claim 1 wherein the α,ω-diene is 1,5-hexadiene or 1,7-octadiene.
Claim 9
Dependent Claim
27 words
A process as claimed in claim 1 wherein the quantity of α,ω-diene is in the range 0.05 to 5 moles per 100 moles of monomeric 1-olefin employed.
Claim 10
Dependent Claim
35 words
A process as claimed in claim 1 wherein the polymerization is conducted in a fluid medium under conditions so that the polymeric 1-olefin forms as solid particles suspended in or fluidized in a fluid medium.
Claim 11
Dependent Claim
18 words
A process as claimed in claim 9 wherein the fluid medium is a liquid hydrocarbon or a gas.
Claim 12
Dependent Claim
27 words
A process as claimed in claim 9 wherein the fluid medium is osobutane or n-pentane and the polymerization temperature is in the range 50° to 112° C.
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) | 1984-02-24 | 1984-08-25 | 1985-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-24 | 1988-08-25 | 1989-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-24 | 1992-08-25 | 1993-02-24 | $7700.00 | Window Closed / Lapsed |