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US4279798A
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Polydiene polyalkylene oxide block copolymers and their use as alcohol hydrocarbon dispersants
Assignee: Omnova Services Inc
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Filing: 1980-03-28
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Granted: 1981-07-21
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Expires: 2000-03-28
Abstract
Abstract A block copolymer of polyalkalene oxide and a polydiene is made by the lithium catalyzed anionic polymerization of a diene followed by polymerization of an alkalene oxide using a double metal cyanide catalyst. The dispersant can be used in forming a crude oil methanol dispersion for transport through unheated pipelines from the North Slope oil fields to Prudhoe Bay.
Inventors
- 👤 Sundar L. Aggarwal
- 👤 Ivan G. Hargis
- 👤 Russell A. Livigni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:51
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/04; C08G65/06; C08G65/08
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
63 words
In a dispersion containing alcohol, and liquid hydrocarbon, the improvement comprising the presence of a small but effective amount to stabilize the dispersion of a block copolymer having within its molecular structure at least two segments, segment A being a polydiene containing a major portion of a 1,4 structure diene, and segment B being a double metal cyanide complex catalyst polymerized alkylene oxide.
Claim 2
Dependent Claim
63 words
In a dispersion containing alcohol, and liquid hydrocarbon, the improvement comprising the presence of a small but effective amount to stabilize the dispersion of a block copolymer having within its molecular structure at least two segments, segment A being a polydiene containing a major portion of a 1,4 structure diene, and segment B being a double metal cyanide complex catalyst polymerized alkylene oxide.
Claim 3
Dependent Claim
41 words
The composition of claim 1 wherein the alcohol is from 1 to 3 parts of methanol, and the liquid hydrocarbon is 1 to 3 parts of crude oil, and the copolymer is present at a level of 0.01 to 1.6 parts.
References Cited (Backward Citations)
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US4039593A
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US3867295A
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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) | 1984-07-20 | 1985-01-19 | 1985-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-20 | 1989-01-19 | 1989-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-20 | 1993-01-19 | 1993-07-21 | $7700.00 | Window Closed / Lapsed |