Non-flammable rigid foam and its use as a building material
Abstract
Abstract The non-flammable rigid foam e.g. used as a building material complies with the requirements of DIN 4102 and which provides a non-toxicity of the combustion fumes according to DIN 53436. It has a mass ratio of resin component:filler of at least 1:2,5 and a bulk density amounting to 50 kg/m 3 to 450 kg/m 3 . The resin component is formed by reaction of 50-62 mass parts resolic resin, 0-15 mass parts furane resin, 25-40 mass parts furfuryl alcohol, 0,5-11,5 mass parts foam stabilizer including 14-17 mass parts per 100 mass parts of resin component plus filler of a curing agent mixture of phosphoric acid, boronhydrofluoric acid, p-toluene sulphonic acid and water. The filler used is a mixture of 40-55 mass % aluminium hydroxide 10-35 mass parts boric acid 2-7 mass parts sodium tetraborate 5-10 mass parts manganese dioxide 1-5 mass parts kopper-II-oxide 1-4 mass parts magnesium hydroxysilicate 1-2 mass parts aluminium silicate.
Inventors
- 👤 Erich Ruhl
- 👤 Johann Thenner
Bibliographic Details
Claims Analysis
Total Claims: 5References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-31 | 1988-01-30 | 1988-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-31 | 1992-01-30 | 1992-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-31 | 1996-01-30 | 1996-07-31 | $7700.00 | Window Closed / Lapsed |