| 摘要 |
1487204 Foamed amino-formaldehyde furfuryl alcohol resins KONINKLIJKE EMBALLAGE INDUSTRIE VAN LEER BV 24 March 1975 [4 April 1974] 15067/74 Headings C3C and C3R Foamed solid amino-formaldehyde furfuryl alcohol resins are made by polymerizing a furfuryl alcohol containing amino-formaldehyde liquid resin in the presence of an acid which is compatible with the liquid resin so that a homogenous mixture is maintained during polymerization, and at least 10% by wt. (based on the resin) of a boron compound, the boron compound being present in sufficient amount so that the foamed resin will pass a muffle furnace test at 500‹ C. (as defined), the amine portion of the resin being urea, thiourea and/or melamine and the resin containing 15-90% by wt. of free or bound furfuryl alcohol and having an amine : formaldehyde molar ratio of 1 : 1-5. In the examples urea-formaldehyde-furfuryl alcohol resins were polymerized in the presence of furan resin, a silicone, boric acid, borax, o-phosphoric acid, polyphosphoric acid, isopropanol, 1,4-butanediol, methanol, water, glucose, ammonium phosphate and sulphate, furfuryl alcohol, dimethoxymethane, dichloromethane, pentane, tetraphosphoric acid, ammonium chloride, sodium bicarbonate, glyoxalboric acid complex, trimethoxylboroxine, sodium tetraborate, tri- and di-chloroethanes and/or talc to produce foams which were fire-retardant. |
