US5525565A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foam-supported double metal cyanide catalysts for polyol synthesis
Assignee: Lyondell Chemical Technology LP
•
Filing: 1994-12-20
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Granted: 1996-06-11
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Expires: 2014-12-20
Abstract
Abstract Foam-supported double metal cyanide (DMC) catalysts are disclosed as useful catalysts for epoxide polymerization. Polyurethane foam-supported catalysts of the invention are more active and show reduced induction periods compared with conventional powdered DMC catalysts. The catalysts of the invention can be recovered from the epoxide polymer products and can be reused to catalyze additional epoxide polymerizations.
Inventors
- 👤 Bi Le-Khac
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:53
CPC Classifications
B; B01; B01J; B01J31/00; B01J31/02; B01J31/06; B01J31/068; B01J27/00; B01J27/24; B01J27/26; B01J23/00; B01J23/70; B01J23/76; B01J23/80; B01J31/16; B01J31/22; C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4829; C08G65/00; C08G65/02; C08G65/04; C08G65/06; C08G65/08; C08G65/10; C08G65/26; C08G65/2642; C08G65/2645; C08G65/2663; C08G65/2693; B01J2531/00; B01J2531/20; B01J2531/26; B01J31/40; B01J31/4015; B01J31/4023; B01J31/403; C08G2110/00; C08G2110/0008; C08G2110/0083; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/584
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
11 words
A double metal cyanide (DMC) catalyst supported on a foamed solid.
Claim 2
Dependent Claim
11 words
A double metal cyanide (DMC) catalyst supported on a foamed solid.
Claim 3
Dependent Claim
21 words
The foam-supported catalyst of claim 1 wherein the foam is one that can be synthesized in the presence of the catalyst.
Claim 4
Dependent Claim
13 words
The foam-supported catalyst of claim 1 wherein the foam is a plastic foam.
Claim 5
Dependent Claim
24 words
A process for making a DMC catalyst supported on a foamed solid, said process comprising forming the foam in the presence of the catalyst.
Claim 6
Dependent Claim
24 words
A process for making a DMC catalyst supported on a foamed solid, said process comprising forming the foam in the presence of the catalyst.
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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) | 1999-06-11 | 1999-12-11 | 2000-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-06-11 | 2003-12-11 | 2004-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-06-11 | 2007-12-11 | 2008-06-11 | $7700.00 | Window Closed / Lapsed |