METHOD FOR PRODUCING AROMATIC HYDROCARBON MODIFIED PHENOLIC RESIN

摘要

PROBLEM TO BE SOLVED: To obtain an aromatic hydrocarbon modified novolak type phenolic resin with a low molecular weight and a narrow molecular weight distribution in high yield. SOLUTION: This method is characterized by reacting phenols, an aromatic hydrocarbon aldehyde resin and aldehydes using an organic phosphonic acid as a catalyst.