Resinous compositions and fire-resistant laminates prepared therefrom

Claim 1

IN THE PROCESS OF PREPARING FIRE-RESISTANT THEREMOSET RESINOUS LAMINATES, THE STEPS COMPRISING IMPREGNATING A SHEET FIBROUS METERICAL WITH A SOLUTION OF A THERMOSETTABLE RESINOUS PRODUCT DERIVED BY REACTING ONLY ONE MOLE OF A PHENOL, FROM 0.8 TO 2.0 MOLES OF DICYANDIANMIDE, AND FROM 0.9 TO 1.5 MOLES OF FORMALDEHYDE PRE MOLE OF THE PHENOL AND DICYANDIANMIDE IN THE PRESENCE OF WATER AND AN ALKALI CATALYST IN AN AMOUNT OF UP TO 5% OF THE WEIGHT OF THE PHENOL, THE MIXTURE BEING REFLUXED FOR AT LEAST 1/2 HOUR AND THEN VACUM DEHYDRATED AT A TEMPERATURE NOT EXCEEDING 100*C., THE RESULTING REACTION PRODUCT BEING DISOLVED IN A VOLATILE SOLVENT TO PROVIDE THE SAID IMPREGNATING SOLUTION, THE RESIN IMPREGNATED SHEET FIBROUS MATERIAL BEING HEATED TO DRIVE OFF THE SOLVENT AND TO ADVANCE THE CURE OF THE RESIN TO A CONDITION WHERE ITS GREENNESS IN LESS THAN 5%, THE FIBROUS SHEET CRYING FROM 0.7 TO 2 TIMES ITS WEIGHT OF THE RSIN AFTER DRYING, SUPERIMPOSING A PLURALITY OF LAYERS OF THE RESIN TREATED FIBROUS SHEET AND MOLDING THE SUPERIMPOSED LAYERS AT A PRESSURE OF FROM 500 TO 5,000 POUNDS PER SQUARE INCH AT TEMPERATURES OF FROM 135*C. TO 165*C. TO FULLY CURE THE APPLIED RESIN AND TO PRODUCE A THERMOSET LAMINATE.