Claims
- 1. A resin mixture for forming a cellular plastic foam, the resin mixture comprising a phenolic resole, an epoxy resin, a phenolic novalak resin, and as curing agents, a base, and an ester and/or an aliphatic carbonate.
- 2. The resin mixture as claimed in claim 1 wherein the phenolic novalak has a number average molecular weight of 1000-1500.
- 3. The resin mixture as claimed in claim 1 wherein the phenolic novalak is present in an amount of from 2% to 30% by weight.
- 4. The resin mixture as claimed in claim 1 wherein the phenolic novalak is present in an amount of from 14 to 25% by weight.
- 5. The resin mixture as claimed in claim 1 having an initial pH of at least 9.
- 6. The resin mixture as claimed in claim 1 wherein the epoxy is present in an amount of from 2 to 30%.
- 7. The resin mixture as claimed in claim 1 wherein the epoxy is present in an amount of from 10 to 20% by weight.
- 8. The resin mixture as claimed in claim 1 wherein the epoxy resin contains at least two epoxy groups in the molecule.
- 9. The resin mixture as claimed in claim 1 wherein the epoxy is based on oligomers of diglycidylether of Bisphenol A or diglycidylether of Bisphenol F or mixtures thereof.
- 10. The resin mixture as claimed in claim 1 wherein the phenolic resole has a reactive solids content in the range of from 50%-85% by weight.
- 11. The resin mixture as claimed in claim 1 wherein the phenolic resole is prepared from an optionally substituted phenol and an aldehyde in a molar ratio of phenol to aldehyde of 1:1 to 1:3.0.
- 12. The resin mixture as claimed in claim 1 wherein the base is potassium hydroxide and/or sodium hydroxide.
- 13. The resin mixture as claimed in claim 1 wherein the ester is a lactone.
- 14. The resin mixture as claimed in claim 1 wherein the ester is selected from one or more of y-butyrolactone and caprolactone.
- 15. The resin mixture as claimed in claim 1 wherein the ester is present in an amount of from 2 to 25% by weight.
- 16. The resin mixture as claimed in claim 1 including a blowing agent.
- 17. The resin mixture as claimed in claim 16 wherein the blowing agent is a liquid and/or a gas.
- 18. The resin mixture as claimed in claim 17 wherein the blowing agent has a boiling point of up to 70° C.
- 19. The resin mixture as claimed in claim 16 wherein the blowing agent is present in the resin mixture in an amount of up to 25% by weight.
- 20. The resin mixture as claimed in claim 16 wherein the blowing agent is a halogenated hydrocarbon.
- 21. The resin mixture as claimed in claim 16 wherein the blowing agent is pentafluorobutane and/or 1, 2 dichloro-1-fluoroethane and/or pentane or mixtures thereof.
- 22. The resin mixture as claimed in claim 1 including a surfactant.
- 23. The resin mixture as claimed in claim 22 wherein the surfactant is non-ionic.
- 24. The resin mixture as claimed in claim 22 wherein the surfactant is a dimethylsiloxane/polyoxyalkylene copolymer.
- 25. The resin mixture as claimed in claim 22 wherein the surfactant is present in an amount of from 1 to 15% by weight.
- 26. A resin mixture for forming a stable closed cell foam, the resin mixture comprising a phenolic resole, an epoxy resin, a phenolic novalak resin, and as curing agents, a base, and an ester and/or an aliphatic carbonate.
- 27. The process for the preparation of a cellular plastic by expanding and curing a resin mixture as claimed in claim 1.
- 28. The process as claimed in claim 27 wherein the cellular plastic is manufactured at atmospheric pressure.
- 29. The process as claimed in claim 28 wherein the cellular plastic is manufactured at a pressure less than atmospheric pressure.
- 30. The process as claimed in claim 29 wherein the cellular plastic is manufactured at a pressure greater than atmospheric pressure.
- 31. The cellular plastic whenever manufactured using a resin mixture as claimed in claim 1.
- 32. The cellular plastic as claimed in claim 31 having a thermal conductivity of less than 0.04 W/mK.
- 33. The cellular plastic as claimed in claim 31 having a thermal conductivity of less than 0.025 W/mK.
- 34. The cellular plastic as claimed in claim 31 of substantially closed cell structure.
- 35. The cellular plastic as claimed in claim 31 having a closed cell content of greater than 90%.
Priority Claims (1)
Number |
Date |
Country |
Kind |
PCT/EP99/08138 |
Oct 1999 |
WO |
|
Parent Case Info
This is a continuation of PCT/EP00/09655, filed Oct. 3, 2000 and published in English.
US Referenced Citations (6)
Foreign Referenced Citations (10)
Number |
Date |
Country |
3329334 |
Feb 1985 |
DE |
0085512 |
Aug 1983 |
EP |
0146499 |
Jun 1985 |
EP |
0166275 |
Jan 1986 |
EP |
2140017 |
Nov 1984 |
GB |
50-130627 |
Oct 1975 |
JP |
01092242 |
Apr 1989 |
JP |
4268323 |
Sep 1992 |
JP |
04364908 |
Dec 1992 |
JP |
WO9411132 |
May 1994 |
WO |
Non-Patent Literature Citations (1)
Entry |
Japanese Abstract Pub. No. 11255939 Pub. date Sep. 29, 1999. |
Continuations (1)
|
Number |
Date |
Country |
Parent |
PCT/EP00/09655 |
Oct 2000 |
US |
Child |
10/120826 |
|
US |