Dicyandiamide phenolaldehyde resin varnish and process of preparation

Claim 1

IN THE PROCESS OF PRODUCING A DICYANDIAMIDEPHENELALDEHYDE RESIN VARNISH, THE STEPS COMPRISING REFLUXING ONE MOLE OF A PHENOL FROM 0.8 MOLE TO 2.0 MOLES OF DICYANDIAMIDE AND FROM 0.5 TO 0.9 MOLE OF AQUEOUS FORMALDEHYDE FOR EACH MOLE OF THE COMBINED PHENOL AND DICYANDIAMIDE FOR A PERIOD OF TIME OF FROM 1/2 HOUR TO 2 HOUR IN THE PRESENCE OF FROM 0.1% TO 5.0%, BASED ON THW WEIGHT OF THE PHENOL, OF AN ALKYLOLAMINE CATALYST HAVING NOT OVER 4 CARBON ATOMS IN THE ALKYLOL RADICALS, EVACUATING THE REFLUXED REACTION PRODUCT TO A VACUUM OF AT LEAST 25 INCHES OF MERCURY WHILE SPPLYING HEAT DURING THE EVACUATION TO A POINT WHERE A SAMPLE OF RESIN IS BRITTLE AT ROOM TEMPERAATURE, THEREAFTER ADDING TO THE REFLUCXED REACTION PRODUCT A VOLATILE SOLVENT SELECTED FROM AT LEAST ONE OF THE GROUPS CONSISTING OF ONE TO THREE CARBON ATOM MONOHYDRIC ALIPHATIC ALCOHOLS WITH NOT OVER 50* BY WEIGHT OF WATER, A SUFFICIENT AMOUNT OF BEXAMETHYLENETERAMINE TO BRING THE RATIO OF THE TOTAL AMOUNT OF FORMALDEHYDE TO THE COMBINED PHENOL AND DISCYANDIAMIDE TO A VALUE OF FROM 0.95 TO 1.5 REFLUXING FOR A PERIOD OF TIME OF FROM 1/2 HOUR TO 2 HOURS, AND THEREAFTER COOLING THE VARNISH TO ROOM TEMPERATURE.