Patent US4133944A successfully refreshed from Google Patents.
US4133944A
Expired / Lapsed
US
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Ethylene polymerization
Assignee: Imperial Chemical Industries Ltd
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Filing: 1975-11-25
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Granted: 1979-01-09
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Expires: 1995-11-25
Abstract
Abstract Ethylene is polymerised or copolymerised using a transition metal catalyst at a pressure in the range 300-1000 atmospheres and a temperature of at least 100 DEG C in the presence of a volatile inert diluent such as pentane, or at least one 1-olefine comonomer such as buten-1, or both. The catalyst can be a Ziegler type catalyst, an organo-compound of a transition metal such as a substituted silylmethyl, cyclopentadienyl, arene, norbornyl, pi -allyl or benzyl compound and may be supported on a suitable support such as silica, alumina, or magnesia. Other catalysts which may be used are supported chromium or molybdenum oxides. If a solid catalyst is used it is preferred to use a material which has been finely dispersed.
Inventors
- 👤 Richard R. Cooper
- 👤 Kenneth S. Whiteley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:56
CPC Classifications
C; C08; C08F; C08F10/00; C08F10/02; C08F110/00; C08F110/02
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
76 words
A process for the homopolymerisation of ethylene which comprises introducing a mixture of from 20 to 80% by weight of a volatile inert diluent and correspondingly from 80 to 20% by weight of ethylene into a polymerisation reactor and in the polymerisation reactor the mixture is contacted with a transition metal polymerisation catalyst at a temperature of from 100° C. up to 350° C. and a pressure of from 300 up to 1000 kgm/cm 2 .
Claim 2
Dependent Claim
76 words
A process for the homopolymerisation of ethylene which comprises introducing a mixture of from 20 to 80% by weight of a volatile inert diluent and correspondingly from 80 to 20% by weight of ethylene into a polymerisation reactor and in the polymerisation reactor the mixture is contacted with a transition metal polymerisation catalyst at a temperature of from 100° C. up to 350° C. and a pressure of from 300 up to 1000 kgm/cm 2 .
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein the volatile inert diluent is an aliphatic hydrocarbon having from 3 to 8 carbon atoms.
Claim 4
Dependent Claim
29 words
The process of claim 1 wherein the mixture is contacted with the transition metal polymerisation catalyst at a pressure in the range 400 up to 800 kgm/cm 2 .
Claim 5
Dependent Claim
16 words
The process of claim 3 wherein the pressure is not more than 600 kgm/cm 2 .
Claim 6
Dependent Claim
17 words
The process of claim 1 wherein a chain transfer agent is also introduced into the polymerisation reactor.
Claim 7
Dependent Claim
17 words
The process of claim 1 wherein the transition metal polymerisation catalyst is in a finely dispersed form.
Claim 8
Dependent Claim
19 words
The process of claim 1 wherein the transition metal polymerisation catalyst is a supported organo-compound of a transition metal.
Claim 9
Dependent Claim
26 words
The process of claim 1 which comprises effecting polymerisation in more than one zone and introducing the transition metal polymerisation catalyst into more than one zone.
Claim 10
Dependent Claim
19 words
The process according to claim 1 wherein the reaction conditions are such that a single fluid phase is obtained.
Claim 11
Dependent Claim
66 words
The process of claim 1 wherein the mixture contains from 40 to 60% by weight of an aliphatic hydrocarbon having from 3 to 8 carbon atoms and correspondingly from 60 to 40% by weight of ethylene and is contacted with the transition metal polymerisation catalyst at a temperature of from 120° C. to 320° C. and a pressure from 400 up to 800 kgm/cm 2 .
Claim 12
Dependent Claim
115 words
A process for the copolymerisation of ethylene which comprises introducing a mixture of from 20 up to 95% by weight of at least one 1-olefine monomer and correspondingly from 80 to 5% by weight of ethylene into a polymerisation reactor in which the mixture is contacted with a transition metal polymerisation catalyst at a temperature of from 100° C. up to 350° C. and a pressure of from 300 up to 1000 kgm/cm 2 and in order to replace the ethylene and comonomer which have been polymerised a feed of fresh ethylene is provided and at least a part of this feed is subjected to a dimerisation step which is effected in the polymerisation reactor.
Claim 13
Dependent Claim
115 words
A process for the copolymerisation of ethylene which comprises introducing a mixture of from 20 up to 95% by weight of at least one 1-olefine monomer and correspondingly from 80 to 5% by weight of ethylene into a polymerisation reactor in which the mixture is contacted with a transition metal polymerisation catalyst at a temperature of from 100° C. up to 350° C. and a pressure of from 300 up to 1000 kgm/cm 2 and in order to replace the ethylene and comonomer which have been polymerised a feed of fresh ethylene is provided and at least a part of this feed is subjected to a dimerisation step which is effected in the polymerisation reactor.
Claim 14
Dependent Claim
23 words
The process of claim 11 wherein the dimerisation step is effected using a dimerisation catalyst comprising a titanium tetra-alkoxide and an aluminium alkyl.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-08 | 1982-07-10 | 1983-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-08 | 1986-07-10 | 1987-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-08 | 1990-07-10 | 1991-01-09 | $7700.00 | Window Closed / Lapsed |