US5093377A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blowing agent and process for preparing polyurethane foam
Assignee: EIDP Inc
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Filing: 1991-08-19
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Granted: 1992-03-03
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Expires: 2011-08-19
Abstract
Abstract The use of 1,1-difluoroethane (HFC-152a) and dimethyl ether, optionally with up to 50 mole % of water, as the blowing agent is disclosed as an efficient route to a rigid, closed-cell polyurethane or polyisocyanurate foam of improved cell structure and excellent insulation properties.
Inventors
- 👤 Philip L. Bartlett
- 👤 Joseph A. Creazzo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:35
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/149; C08J2375/00; C08J2375/04; Y; Y10; Y10S; Y10S521/00; Y10S521/91
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
73 words
In a process for producing a closed-cell rigid polyurethane or polyisocyanurate polymer foam wherein an isocyanate-containing compound is mixed and allowed to react with an active hydrogen-containing compound in the presence of a blowing agent composition, the improvement wherein the blowing agent composition consists essentially of 2 to about 25 weight percent, based on the combined weight of the isocyanate and the active hydrogen-containing compound, of a mixture of 1,1-difluoroethane and dimethyl ether.
Claim 2
Dependent Claim
73 words
In a process for producing a closed-cell rigid polyurethane or polyisocyanurate polymer foam wherein an isocyanate-containing compound is mixed and allowed to react with an active hydrogen-containing compound in the presence of a blowing agent composition, the improvement wherein the blowing agent composition consists essentially of 2 to about 25 weight percent, based on the combined weight of the isocyanate and the active hydrogen-containing compound, of a mixture of 1,1-difluoroethane and dimethyl ether.
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein the blowing agent composition contains 1,1-difluoroethane and 5-75 weight percent of dimethyl ether.
Claim 4
Dependent Claim
19 words
The process of claim 1 wherein the blowing agent composition contains 1,1-difluoroethane and 5-30 weight percent of dimethyl ether.
Claim 5
Dependent Claim
19 words
The process of claim 1 wherein the blowing agent composition also contains up to 50 mole percent of water.
Claim 6
Dependent Claim
14 words
The process of claim 1 wherein said polyisocyanurate has an isocyanate index of 0.9-10.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-03-03 | 1995-09-02 | 1996-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-03 | 1999-09-02 | 2000-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-03 | 2003-09-02 | 2004-03-03 | $7700.00 | Window Closed / Lapsed |