Claims
- 1. A non-flammable rigid foam on the basis of phenolic resin and for furane resin, containing aluminium hydroxide as a filler, the resin component being formed by reaction of phenolic resin, furfuryl alcohol and a sulpho acid as curing agent, wherein
- the mass ratio of resin substance: filler substance is at least 1:2,5 and up to 1:3,2 and the bulk density is from 50 kg/m.sup.3 to 450 kg/m.sup.3 and the resin compound is the reaction product obtained by the reaction with one another of
- 50-62 mass parts resolic resin
- 0-15 mass parts furanic resin
- 25-40 mass parts furfuryl alcohol
- 0.5-1.5 mass parts foam stabiliser
- including 14-17 parts by mass per 100 parts by mass of resin component+filler substance of a curing agent mixture composed of
- '-50 mass parts phosphoric acid
- 12-17 mass parts boron hydrofluoric acid
- 6-7 mass parts p-toluene sulphonic acid or p-phenol sulphonic acid and
- 32-35 mass parts water.
- 2. A non-flammable rigid foam according to claim 1, wherein
- the filler substance is composed of
- 40-55 mass parts aluminium hydroxide
- 10-35 mass parts boric acid
- 2-7 mass parts sodium tetraborate
- 5-10 mass parts manganese dioxide
- 1-5 mass parts copper-II oxide
- 1-4 mass parts magnesium hydroxide silicate
- 1-2 mass parts aluminium silicate
- the ratio of borate:boric acid being 1:5.
- 3. A non-flammable rigid foam according to claim 1 wherein
- the foam stabiliser is pyrogenic silicic acid.
- 4. A non-flammable rigid foam according to claim 1, wherein
- the aluminium hydroxide has a screen analysis curve according to the following screen passing data
- 25% 5.5 .mu.m
- 50% 52.0 .mu.m
- 75% 80.0 .mu.m.
Priority Claims (1)
Number |
Date |
Country |
Kind |
3244779 |
Dec 1982 |
DEX |
|
Parent Case Info
This is a division of application Ser. No. 555,403, filed Nov. 28, 1983.
US Referenced Citations (2)
Divisions (1)
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Number |
Date |
Country |
Parent |
555403 |
Nov 1983 |
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