METHOD OF PRODUCING PHENOL NOVOLAK RESIN

摘要

PROVIDED IS A PROCESS FOR PRODUCING A PHENOL NOVOLAK RESIN HAVING AN ORTHO RATIO OF 30 TO 60%, WHEREIN A PHENOLIC COMPOUND AND AN ALDEHYDE ARE REACTED IN THE PRESENCE OF AN AROMATIC SULFONIC ACID CATALYST AT A TEMPERATURE OF 110 TO 160°C UNDER PRESSURIZED CONDITION, AND THE AMOUNT OF REMAINING OXALIC ACID AND FORMIC ACID IS REDUCED AND THE CORROSION PROPERTY TO A REACTION APPARATUS IS DECREASED.