Claims
- 1. A process to produce a polyurethane foam or a polyisocyanurate foam, which processes comprises:(A) combining a mixture of compounds needed to produce a polyurethane with a sufficient quantity of the azeotrope-like mixture as a blowing agent, under reaction conditions which produce a foamed polyurethane; or (B) combining a mixture of compounds needed to produce a polyisocyanurate with a sufficient quantity of the azeotrope-like mixture as a blowing agent, under reaction conditions which produce a foamed polyisocyanurate; wherein said blowing agent is an azeotrope-like mixture, which mixture comprises: (a) pentafluoropropane; and (b) a hydrofluorocarbon of the formula: CxFyHz wherein x is 3, 4, 5, or 6 and y and z are each independently 1 or a positive whole number such that the result of y/(y+z) is greater than 0.67.
- 2. The process of claim 1 wherein the hydrofluorocarbon is selected from 1,1,2,2,3-pentafluoropropane; 1,1,2,3,3-pentafluoropropane; 1,1,1,2,3-pentafluoropropane; 1,1,1,3,3-pentafluoropropane; or mixtures thereof.
- 3. The process of claim 2 wherein the hydrofluorocarbon is selected from 1,1,2,2,3-pentafluoropropane or 1,1,1,3,3-pentafluoropropane.
- 4. The process of claim 2 wherein the pentafluoropropane is 1,1,1,3,3-pentafluoropropane.
- 5. The process of claim 1 wherein the hydrofluorocarbon is 1,1,2,2,3-pentafluoropropane.
- 6. The process of claim 1 wherein the hydrofluorocarbon is 1,1,2,3,3-pentafluoropropane.
RELATED APPLICATIONS
This is divisional of application, Ser. No. 08/685,821, filed on Aug. 31. 1998, now U.S. Pat. No. 5,800,729 which is a continuation-in-part application of Ser. No. 60/001,530, filed Jul. 26, 1995.
US Referenced Citations (4)
Number |
Name |
Date |
Kind |
5496866 |
Sommerfield et al. |
Mar 1996 |
A |
5562857 |
Werner et al. |
Oct 1996 |
A |
5672294 |
Lund et al. |
Sep 1997 |
A |
5800729 |
Wilson et al. |
Sep 1998 |
A |
Foreign Referenced Citations (4)
Number |
Date |
Country |
WO9422973 |
Jan 1994 |
WO |
WO9402563 |
Mar 1994 |
WO |
WO9508603 |
Mar 1995 |
WO |
WO9610063 |
Apr 1996 |
WO |
Non-Patent Literature Citations (1)
Entry |
Abstract, Database WPI, Week 9521, Derwent Publications Ltd., London, GB, AN 95-159086 & JP, A, 70 082 405 (Matsushita), Mar. 28, 1995. |
Provisional Applications (1)
|
Number |
Date |
Country |
|
60/001530 |
Jul 1995 |
US |