METHOD FOR PRODUCING NOVOLAC RESIN, AND NOVOLAC RESIN

摘要

Disclosed is a method for efficiently producing a novolac resin having a low molecular weight, wherein a phenol and an aldehyde are reacted with each other under mild conditions. The method for producing a novolac resin is characterized in that a phenol and an aldehyde are reacted with each other in the presence of a catalyst that contains a boron compound represented by the following formula (I): B-(OR)3 (wherein R represents a hydrogen atom or an alkyl group having 1-10 carbon atoms) and an acid having a pKa of 5.0 or less.