METHOD FOR PRODUCING NOVOLAC TYPE PHENOLIC RESIN, NOVOLAC TYPE PHENOLIC RESIN, THERMOSETTING RESIN COMPOSITION, AND CURED PRODUCT

摘要

A method for producing a novolac type phenolic resin by reacting phenols and saturated aliphatic aldehyde having 6-20 carbon atoms under the presence of a boron compound represented by general formula (1), B-(OR)3 (1), (in the formula, the three Rs are each independently a hydrogen atom or an alkyl group having 1-10 carbon atoms) and an acid with a pKa at 25°C of 5.0 or less.