The present invention has excellent heat resistance and excellent electrical characteristics and significantly improved brittle thermosetting resin and the provision of the method and the thermosetting resin obtained in one of the object accordingly. The present invention, a) to the thermosetting resin having a polyfunctional phenol compound represented by the general formula I, b) a diamine compound represented by the formula II, and c) is heated to react, dihydrobenzoxazine jinhwan structure aldehyde compound provides a method ; & . Formula I & ; & Formula II & ; [wherein, X is an organic group having a carbon number of 6 or more, Y is an organic group having 5 or more comprises an aromatic ring, X and Y all of which as a hetero atom N, O, and may have a F, X, each of the benzene rings on both sides Y X, binds to a different atom in Y]
展开▼
