| abstract |
A method for producing a novolak-type phenolic resin that can obtain a high-yield novolak-type phenolic resin having a low content of a low-nucleate component, a high content of a high-molecular-weight component, a large weight-average molecular weight, and a high softening point. provide. A first step of heterogeneously reacting phenols and aldehydes with 100 parts by mass of phenols in the presence of 5 parts by mass or more of phosphoric acid, a solvent extraction method, a liquid / liquid separation method, A second step of performing a fractionation treatment by at least one selected from reprecipitation methods. [Selection diagram] None |