Method of producing an aqueous emulsion of a phenol formaldehyde resol resin suitable for impregnating fibrous material

Claim 1

IN THE METHOD OF PRODUCING AN AQUEOUS EMULSION OF A PHENOL FORMALDEHYDE RESIN, PARTICULARLY ADAPTED FOR THE IMPREGNATION OF FIBROUS MATERIAL BY REACTING PHENOL IN WATER WITH AN EXCESS OF FORMALDEHYDE IN THE PRESENCE OF ORGANIC BASES CONTAINING AMINO GROUPS OR AMMONIA, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT THE REACTION BETWEEN THE PHENOL AND THE FORMALDEHDE IN AN AQUEOUS MADIUM IN WHICH THE ONLY BASES PRESENT ARE ORGANIC NITROGEN BAES CONTAINING TERTIARYL AINO GROUPS SELECTED FROM THE GROUP CONSISTING OF TRIMETHYLAMINE. TRIETHYLAMINE, TRIISOBUTYLAMMINE, TRIETHANOLAMINE AND DIETHYLCYCLOHEXYLAMINE ORGANIC NITROGEN BASES CONTAINING SECONDARY AMINO GROUPS OF UP TO AND INCLUDING 6 CARBON ATOMS AND NITROGEN BASES SELECTED FROM THE GROUP CONSISTING OF AMMONIA AND ORGANIC NITROGEN BASES CONTAINING PRIMAARY AMINO GROUPS OF UP TO AND INCLUDING 6 CARBON ATOMS THE RATIO OF THE NUMBER OF TERITARY AMINO GROUPS TO THE NUMBER OF THE OTHER AMINO GROUPS AND AMMONIA LIES BETWEEN 1:2.5 AND 1:3.5, THE PK OF THE NITROGEN BASES IS 5 AT 20*C AND WHEREIN SAID BAESE ARE SOLUBLE IN THE REACTION MIXTURE.