Claims
- 1. In a method for the preparation of a rigid polyurethane and/or polyisocyanurate foam by reacting a polyisocyanate and a polyol in the presence of a blowing agent, the improvement wherein a fluorinated inert, insoluble, non-blowing liquid having a boiling point of at least 60.degree. C. is also present during the reaction.
- 2. The method according to claim 1 wherein a blowing agent is used which has a boiling point between -70.degree. C. and 0.degree. C. at 1 bar.
- 3. The method according to claim 1 wherein a blowing agent is used which is selected amongst the group consisting of CHClF.sub.2, CH.sub.2 F.sub.2, CF.sub.3 CH.sub.2 F, CF.sub.2 HCF.sub.2 H, CH.sub.3 CClF.sub.2, C.sub.2 H.sub.4 F.sub.2, C.sub.2 HF.sub.5, C.sub.2 HClF.sub.4 and mixtures thereof.
- 4. The method according to claim 1 wherein the blowing agent is water.
- 5. The use according to claim 1 wherein the inert, insoluble, non-blowing liquid is selected from the group consisting of fluorinated hydrocarbons, fluorinated ethers, fluorinated tertiary amines, fluorinated amino-ethers and fluorinated sulfones.
- 6. The method according to claim 1 wherein the inert, insoluble, non-blowing liquid is selected from the group consisting of fluorinated ethers and fluorinated amino-ethers.
- 7. The method according to claims 1 wherein a surfactant is also used.
- 8. The method according to claim 7 wherein the surfactant is a fluorinated surfactant.
- 9. The method according to claim 1 wherein the amount of blowing agent is 1-20 parts by weight per 100 parts by weight of reaction system.
- 10. The method according to claim 7 wherein the amount of surfactant is 0.02-5 parts by weight per 100 parts by weight of reaction system.
- 11. The method according to claim 1 wherein the amount of inert, insoluble, non-blowing liquid is 0.02-5 parts by weight per 100 parts by weight of reaction system.
Priority Claims (4)
Number |
Date |
Country |
Kind |
9106967 |
Apr 1991 |
GBX |
|
9112622 |
Jun 1991 |
GBX |
|
9117749 |
Aug 1991 |
GBX |
|
9123205 |
Nov 1991 |
GBX |
|
Parent Case Info
This is a division of application No. 07/852,071, filed on Mar. 16, 1992 abandoned.
US Referenced Citations (4)
Foreign Referenced Citations (3)
Number |
Date |
Country |
03000743 |
Jan 1991 |
JPX |
1589562 |
May 1981 |
GBX |
2226030 |
Jun 1990 |
GBX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
852071 |
Mar 1992 |
|