US5767324A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyols
Assignee: Huntsman International LLC
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Filing: 1996-11-06
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Granted: 1998-06-16
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Expires: 2016-11-06
Abstract
Abstract Process for reducing the level of unsaturation in a polyether polyol having an oxypropylene content of at least 30% by weight calculated on the total amount of oxyalkylene units in the polyol and having a number average equivalent weight of at least 1000 by subjecting the polyol to ultrafiltration.
Inventors
- 👤 Pierre Gilbert Henri Jean Chaffanjon
- 👤 Minh Son Le
- 👤 Robert Henry Carr
- 👤 Howard Matthew Colquhoun
- 👤 Jan Frans Hernalsteen
- 👤 Julien Armand Devos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:56
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/30; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4866; C08G2110/00; C08G2110/0008
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
77 words
A process for reducing the level of unsaturation in a polyether polyol having an oxypropylene content of at least 30% by weight calculated on total amount of oxyalkylene units in the polyol and having a number average equivalent weight of at least 1000 wherein the reduction of the level of unsaturation is conducted by subjecting the polyol to ultrafiltration, the polyol having been added to an organic solvent prior to subjecting the polyether polyol to said ultrafiltration.
Claim 2
Dependent Claim
77 words
A process for reducing the level of unsaturation in a polyether polyol having an oxypropylene content of at least 30% by weight calculated on total amount of oxyalkylene units in the polyol and having a number average equivalent weight of at least 1000 wherein the reduction of the level of unsaturation is conducted by subjecting the polyol to ultrafiltration, the polyol having been added to an organic solvent prior to subjecting the polyether polyol to said ultrafiltration.
Claim 3
Dependent Claim
18 words
Process according to claim 1 wherein the filter used has a molecular weight cut-off of 1-25 K daltons.
Claim 4
Dependent Claim
25 words
The process of claim 1 wherein said organic solvent is selected from the group consisting of methanol, ethanol, butanol, propanol, tetrahydrofuran, dichloromethane and mixtures thereof.
Claim 5
Dependent Claim
21 words
The process of claim 3 wherein said organic solvent is selected from the group consisting of methanol, ethanol and mixtures thereof.
Claim 6
Dependent Claim
33 words
The process of claim 4 wherein said organic solvent is an aqueous organic solvent selected from the group consisting of a mixture of methanol in water and a mixture of ethanol in water.
Claim 7
Dependent Claim
25 words
The process of claim 5 wherein said mixture of methanol in water has a weight ratio of methanol to water of from 10/90 to 90/10.
Claim 8
Dependent Claim
15 words
The process of claim 6 wherein said weight ratio of methanol in water is 50/50.
Claim 9
Dependent Claim
25 words
The process of claim 5 wherein said mixture of ethanol in water has a weight ratio of ethanol to water of from 10/90 to 90/10.
References Cited (Backward Citations)
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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) | 2001-06-15 | 2001-12-15 | 2002-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-06-15 | 2005-12-15 | 2006-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-06-15 | 2009-12-15 | 2010-06-16 | $7700.00 | Window Closed / Lapsed |