PRODUCTION METHOD FOR NOVOLAK

摘要

PROBLEM TO BE SOLVED: To provide a method for efficiently producing a novolak which is excellent in strengths and in which fluidity is compatible with rapidly curing properties. SOLUTION: In this production method, a phenol is reacted with formaldehyde or its compound in the presence of a catalyst comprising a divalent-metal oxide and an acid having a dissociation constant pKa of 1.5-5.0.