The method for producing a polyvalent hydroxy resin.

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PROBLEM TO BE SOLVED : To provide a thermosetting molding material which has a high glass transition temperature and high heat resistance and has a small coefficient of thermal expansion even at a high temperature.SOLUTION : A polyhydric hydroxy resin contains, based on the whole resin, 70% or more of a polyhydric hydroxy resin obtained by reacting an aromatic monomer having a plurality of phenolic hydroxyl groups with a crosslinking agent represented by formula (I). (Rto Rare each independently a hydroxyl group, a 1-5C alkyl group, or a 1-5C alkoxy group.)SELECTED DRAWING : None