US4605808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cationic polymerization of 1-olefins
Assignee: BP Chemicals Ltd
•
Filing: 1984-10-30
•
Granted: 1986-08-12
•
Expires: 2004-10-30
Abstract
Abstract This invention relates to a process for producing polyisobutene which has at least 70% of its unsaturation in the terminal position. The process uses a complex of boron trifluoride and alcohol as catalyst and a contact time of at least 8 minutes. The feature of the process is its ability to use longer contact times than used hitherto thereby facilitating its commercial operation and improving the control of such an operation. The high terminal unsaturation improves the reactivity of the polymer.
Inventors
- 👤 John N. R. Samson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:00
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
75 words
A liquid phase process for the cationic polymerisation of a feedstock comprising 1-olefins in the presence of boron trifluoride as catalyst at a temperature between -100° and +50° C. characterised in that the catalyst is a preformed complex of boron trifluoride and an alcohol and the contact time of the polymerisation reaction is at least 8 minutes such that at least 70% of the unsaturated linkages in the polymer product are in the terminal position.
Claim 2
Dependent Claim
75 words
A liquid phase process for the cationic polymerisation of a feedstock comprising 1-olefins in the presence of boron trifluoride as catalyst at a temperature between -100° and +50° C. characterised in that the catalyst is a preformed complex of boron trifluoride and an alcohol and the contact time of the polymerisation reaction is at least 8 minutes such that at least 70% of the unsaturated linkages in the polymer product are in the terminal position.
Claim 3
Dependent Claim
21 words
A process according to claim 1 wherein the hydrocarbon feedstock comprising 1-olefins contains 4 to 16 carbon atoms in the 1-olefin.
Claim 4
Dependent Claim
16 words
A process according to claim 1 or 2 wherein the hydrocarbon feedstock is a butadiene raffinate.
Claim 5
Dependent Claim
18 words
A process according to claim 3 wherein the hydrocarbon feedstock contains at least 15% by weight of isobutene.
Claim 6
Dependent Claim
20 words
A process according to claim 1 wherein the process is carried out under pressure when the hydrocarbon feed is gaseous.
Claim 7
Dependent Claim
21 words
A process according to claim 1 wherein the alcohol in the preformed complex catalyst contains from 1 to 8 carbon atoms.
Claim 8
Dependent Claim
20 words
A process according to claim 6 wherein the alcohol in the preformed complex catalyst contains 1 to 4 carbon atoms.
Claim 9
Dependent Claim
16 words
A process according to claim 7 wherein the alcohol in the preformed complex catalyst is ethanol.
Claim 10
Dependent Claim
21 words
A process according to claim 1 wherein the molar ratio of boron trifluoride to the alcohol is from 0.5:1 to 5:1.
Claim 11
Dependent Claim
16 words
A process according to claim 1 wherein the contact time is from 8 to 70 minutes.
Claim 12
Dependent Claim
87 words
A liquid phase process for the cationic polymerisation of a butadiene raffinate in the presence of boron trifluoride as catalyst at a temperature between -100° and +50° C., characterised in that the catalyst is a preformed complex of boron trifluoride and ethanol wherein the molar ratio of boron trifluoride to ethanol is from 0.5:1 to 1:1, and the contact time of the polymerisation reaction is at least 8 minutes such that at least 70% of the unsaturated linkages in the polymer product are in the terminal position.
Claim 13
Dependent Claim
87 words
A liquid phase process for the cationic polymerisation of a butadiene raffinate in the presence of boron trifluoride as catalyst at a temperature between -100° and +50° C., characterised in that the catalyst is a preformed complex of boron trifluoride and ethanol wherein the molar ratio of boron trifluoride to ethanol is from 0.5:1 to 1:1, and the contact time of the polymerisation reaction is at least 8 minutes such that at least 70% of the unsaturated linkages in the polymer product are in the terminal position.
Claim 14
Dependent Claim
18 words
A process according to claim 11, wherein the butadiene raffinate contains at least 15% by weight of isobutene.
Claim 15
Dependent Claim
16 words
A process according to claim 11, wherein the contact time is from 12 to 20 minutes.
Claim 16
Dependent Claim
36 words
A process according to claim 11, wherein the butadiene raffinate contains at least 15% by weight of isobutene, from 10% to 20% by weight of butanes, and from 20% to 40% by weight of normal butenes.
Claim 17
Dependent Claim
21 words
A process according to claim 1, wherein the molar ratio of boron trifluoride to the alcohol is from 0.5:1 to 1:1.
References Cited (Backward Citations)
US2559984A
Cited
US2918508A
Cited
US3024226A
Cited
US3166546A
Cited
US3306907A
Cited
US3346354A
Cited
US3382291A
Cited
US3634383A
Cited
US3726842A
Cited
US3778487A
Cited
US3780128A
Cited
US3935249A
Cited
US3927041A
Cited
US4152499A
Cited
GB1592016A
Cited
US4225739A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-08-11 | 1990-02-10 | 1990-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-11 | 1994-02-10 | 1994-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-11 | 1998-02-10 | 1998-08-12 | $7700.00 | Window Closed / Lapsed |