Novolak Aralkyl resin, preparation process thereof, and composition containing said resin

摘要

A preparation process for a novalak aralkyl resin having excellent heat resistance and curing properties involves reacting 0.4 to 0.8 mol of an aralkyl compound based on one mol of the low molecular weight novolak containing 90% by weight or more of bi-nuclear novolak in the presence of an acidic catalyst. The process comprises first melting the low molecular weight novolak, heating it up to a reaction temperature, then adding 0.001 to 0.05% by weight of the acidic catalyst to the total amount of the low molecular weight novolak and the aralkyl compound, then continuously adding the aralkyl compound for reaction, and neutralizing the residual acidic catalyst after the completion of the reaction. A novolak aralkyl resin obtainable by the above preparation process, and a novolak aralkyl resin composition containing that resin, are also provided.