Patent ID: 6992166

Claim:
A method of producing a phenolic resin comprising the following steps (i) and (ii): (i) a first step in which a dihydroxy compound represented by the following formula (1) is partially dehydrated by a dehydration reaction, wherein, Ar represents an aromatic group having 6 to 20 carbon atoms; R 1 to R 4 represent each independently a hydrogen atom, alkyl group having 1 to 20 carbon atoms, cycloalkyl group having 5 to 20 carbon atoms or aralkyl group having 7 to 20 carbon atoms; R 1 and R 3 do not simultaneously represent a hydrogen atom, and R 2 and R 4 do not simultaneously represent a hydrogen atom, (ii) a second step in which the partially dehydrated dihydroxy compound obtained in the first step is reacted with a phenolic compound by mol ratio of 40:100 to 90:100.