METHOD FOR PRODUCING NOVOLAK-TYPE PHENOLIC RESIN

摘要

PROBLEM TO BE SOLVED: To provide a method for producing a novolak-type phenolic resin with narrow molecular weight distribution. SOLUTION: This method for producing a novolak-type phenolic resin is characterized by comprising reaction between a methylol compound of a phenol and the phenol is the presence of an organophosphonic acid as the catalyst.