Patent ID: 7060779

Claim:
A process for producing a hydrocarbon-phenol resin, comprising: (1) reacting a phenolic compound and dicyclopentadiene in the presence of an acid catalyst at a temperature in the range of 50° C. to 90° C. or, if the melting point of the phenolic compound is higher than 50° C., in the range from the melting point of the phenolic compound to 90° C., wherein the concentration of the acid catalyst is from 0.001 to 10% by mass relative to the total mass of phenolic compound, dicyclopentadiene, and acid catalyst, the concentration of moisture is maintained at 200 ppm or less, and the dicyclopentadiene is added to the phenolic compound intermittently or continuously so that the molar fraction of the amount of ether product relative to that of the mixture of products is 0.1 or more; and (2) after addition of the dicyclopentadiene, increasing the temperature to 110° C. or higher so as to continue the reaction further and substantially extinguish the ether product.