Patent US4798884A successfully refreshed from Google Patents.
US4798884A
Expired / Lapsed
US
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Process for the working-up of ethylene/carbon monoxide alternating copolymers
Assignee: Shell USA Inc
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Filing: 1986-12-23
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Granted: 1989-01-17
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Expires: 2006-12-23
Abstract
Abstract The invention is a process for working up a linear alternating copolymer of carbon monoxide, ethylene and optionally at least one olefinically unsaturated hydrocarbon, which process comprises contacting the copolymer with an organic solvent in the absence of molecular oxygen and under conditions effective to reduce the amount of impurities in the copolymer, and drying the copolymer in the absence of molecular oxygen.
Inventors
- 👤 Henricus M. J. Brons
- 👤 Maarten M. Geuze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:18
CPC Classifications
C; C08; C08G; C08G67/00; C08G67/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
85 words
A process for working up a linear alternating copolymer of carbon monoxide and ethylene which process comprises washing the copolymer in the absence of molecular oxygen with an organic solvent selected from the group consisting of aliphatic alcohols, ketones, ethers, nitriles and saturated hydrocarbons, separating the copolymer from the solvent and drying the copolymer at a temperature of at least (T-30)°C., wherein T is the boiling point of the solvent at room pressure, in the absence of molecular oxygen and in the absence of water.
Claim 2
Dependent Claim
85 words
A process for working up a linear alternating copolymer of carbon monoxide and ethylene which process comprises washing the copolymer in the absence of molecular oxygen with an organic solvent selected from the group consisting of aliphatic alcohols, ketones, ethers, nitriles and saturated hydrocarbons, separating the copolymer from the solvent and drying the copolymer at a temperature of at least (T-30)°C., wherein T is the boiling point of the solvent at room pressure, in the absence of molecular oxygen and in the absence of water.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein washing and drying are under a nitrogen atmosphere.
Claim 4
Dependent Claim
11 words
The process of claim 1 wherein washing is carried out batchwise.
Claim 5
Dependent Claim
11 words
The process of claim 1 wherein drying is carried out batchwise.
Claim 6
Dependent Claim
16 words
The process of claim 1 wherein washing and drying are carried out in a single unit.
Claim 7
Dependent Claim
85 words
A process for working up a linear alternating polymer of carbon monoxide, ethylene and propylene which process comprises washing the polymerin the absence of molecular oxygen with an organic solvent selected from the group consisting of aliphatic alcohols, ketones, ethers, nitriles and saturated hydrocarbons, separating the polymer from the solvent and drying the polymer at a temperature of at least (T-30)°C., wherein T is the boiling point of the solvent at room pressure, in the absence of molecular oxygen and in the absence of water.
Claim 8
Dependent Claim
85 words
A process for working up a linear alternating polymer of carbon monoxide, ethylene and propylene which process comprises washing the polymerin the absence of molecular oxygen with an organic solvent selected from the group consisting of aliphatic alcohols, ketones, ethers, nitriles and saturated hydrocarbons, separating the polymer from the solvent and drying the polymer at a temperature of at least (T-30)°C., wherein T is the boiling point of the solvent at room pressure, in the absence of molecular oxygen and in the absence of water.
Claim 9
Dependent Claim
14 words
The process of claim 6 wherein washing and drying are under a nitrogen atmosphere.
Claim 10
Dependent Claim
19 words
The process of claim 6 wherein drying the copolymer further comprises compressing the copolymer to reduce the solvent content.
Claim 11
Dependent Claim
15 words
The process of claim 8 wherein the drying is carried out in a single unit.
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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) | 1992-01-17 | 1992-07-18 | 1993-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-17 | 1996-07-18 | 1997-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-17 | 2000-07-18 | 2001-01-17 | $7700.00 | Window Closed / Lapsed |