US6018017A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Highly active double metal cyanide catalysts
Assignee: Lyondell Chemical Technology LP
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Filing: 1997-10-08
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Granted: 2000-01-25
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Expires: 2017-10-08
Abstract
Abstract Improved double metal cyanide catalysts are disclosed. The substantially amorphous catalysts of the invention are more active for polymerizing epoxides than conventional DMC catalysts, which have a substantial crystalline component. Polyol products made with the catalysts are unusually clear, have exceptionally low unsaturations, and contain no detectable amount of low molecular weight polyol impurities. Methods of making the improved DMC catalysts are also disclosed. In one method, the reactants are intimately combined to produce a catalyst of the invention. In another method, an organic complexing agent is initially present in the reactant solutions.
Inventors
- 👤 Bi Le-Khac
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:11
CPC Classifications
B; B01; B01J; B01J31/00; B01J31/16; C; C08; C08G; C08G65/00; C08G65/02; C08G65/26; C08G65/2642; C08G65/2645; C08G65/2663; B01J27/00; B01J27/24; B01J27/26
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
24 words
A polyether polyol having a nominal hydroxyl functionality of at least 3, mostly secondary hydroxyl groups, and an unsaturation less than about 0.007 meq/g.
Claim 2
Dependent Claim
24 words
A polyether polyol having a nominal hydroxyl functionality of at least 3, mostly secondary hydroxyl groups, and an unsaturation less than about 0.007 meq/g.
Claim 3
Dependent Claim
19 words
The polyether polyol of claim 1 wherein the polyol is a polyoxypropylene polyol or an ethylene oxide-propylene oxide copolymer.
Claim 4
Dependent Claim
14 words
The polyether polyol of claim 1 having an unsaturation less than about 0.005 meq/g.
Claim 5
Dependent Claim
14 words
The polyether polyol of claim 1 having an unsaturation less than about 0.004 meq/g.
References Cited (Backward Citations)
US5300535A
Cited
US5068304A
Cited
US5136010A
Cited
US5185420A
Cited
US5767324A
Cited
US5470813A
Cited
US5482908A
Cited
US5728745A
Cited
US5668191A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-01-24 | 2003-07-26 | 2004-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-01-24 | 2007-07-26 | 2008-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-01-24 | 2011-07-26 | 2012-01-25 | $7700.00 | Window Closed / Lapsed |