Patent US4868254A successfully refreshed from Google Patents.
US4868254A
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US
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Catalytic reduction of carbon monoxide/olefin copolymer to polyalcohol
Assignee: Shell USA Inc
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Filing: 1987-12-29
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Granted: 1989-09-19
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Expires: 2007-12-29
Abstract
Abstract A polymeric polyalcohol of high molecular purity is obtained by sodium botohydride reduction of a linear alternating copolymer of carbon monoxide and ethylene in a liquid-phase solution in hexafluoroisopropanol at ambient temperature and pressure.
Inventors
- 👤 Pui K. Wong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:25
CPC Classifications
C; C08; C08G; C08G67/00; C08G67/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
48 words
A homogeneous process for the production of a polymeric polyalcohol of at least 90% molecular purity by contacting a linear alernating copolymer of carbon monoxide and ethylene with at least a stoichiometric amount of sodium borohydride in liquid-phase solution in hexafluoroisopropanol at ambient conditions of temperature and pressure.
Claim 2
Dependent Claim
48 words
A homogeneous process for the production of a polymeric polyalcohol of at least 90% molecular purity by contacting a linear alernating copolymer of carbon monoxide and ethylene with at least a stoichiometric amount of sodium borohydride in liquid-phase solution in hexafluoroisopropanol at ambient conditions of temperature and pressure.
Claim 3
Dependent Claim
16 words
The process of claim 1 wherein the polyalcohol is of a molecular purity at least 95%.
Claim 4
Dependent Claim
28 words
The process of claim 2 wherein the linear alternating polymer is contacted with the sodium borohydride at a temperature of from about 15° C. to about 40° C.
Claim 5
Dependent Claim
24 words
The process of claim 1 wherein at last 1.5 grams of said sodium borohydride are contacted with each gram of said linear alternating copolymer.
Claim 6
Dependent Claim
21 words
The process of claim 1 wherein said polymeric polyalcohol is recovered from the solution in hexafluoroisopropanol by evaporation of the hexafluoroisopropanol.
References Cited (Backward Citations)
US2495292A
Cited
US2495286A
Cited
GB1081304A
Cited
US3694412A
Cited
EP0121965A2
Cited
US4513117A
Cited
US4513117B1
Cited
EP0181014A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-18 | 1993-03-20 | 1993-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-18 | 1997-03-20 | 1997-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-18 | 2001-03-20 | 2001-09-19 | $7700.00 | Window Closed / Lapsed |