Claims
- 1. A CFC-free foam comprising a closed-cell, resol resin having a density from about 0.5 to about 3.0 pounds per cubic foot and having, contained within its cells, a perfluoroether.
- 2. The foam of claim 1 wherein the density of the foam is from about 0.8 to about 2.8.
- 3. The foam of claim 1 wherein the perfluoroether is a polyether.
- 4. The foam of claim 1 wherein the perfluoroether is a polymerized, oxidized 1,1,2,3-hexafluoro-propene.
- 5. The foam of claim 1 wherein the cells additionally contain a hydrogenated chlorofluoro carbon or a hydrogenated fluorocarbon.
- 6. The foam of claim 1 where the cells contain 1-chloro-1,1,-difluoroethane.
- 7. The foam of claim 1 wherein the foam is prepared from a resol resin having a viscosity of about 7,000 to about 20,000 centipoise at 40.degree. C.
- 8. The foam of claim 1 wherein the free water content of the resin is from about 4 to about 8%.
Parent Case Info
This is a division of U.S. patent application Ser. No. 08/920,616, filed Aug. 27, 1997.
US Referenced Citations (12)
Foreign Referenced Citations (3)
Number |
Date |
Country |
0305084 |
Mar 1989 |
EPX |
0348199 |
Dec 1989 |
EPX |
0439283 |
Jul 1991 |
EPX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
920616 |
Aug 1997 |
|