Ishida and Sanders [9], [10], [11] and [12] invented a novel class of arylamine-based bifunctional benzoxazine resin. In their benzoxazine resins, a bifunctional bisphenol-A-xylidine type benzoxazine resin (BA-35x) provided superior thermal stability to a bisphenol-A-aniline type (BA-a) and a bisphenol-A-toluidine type (BA-mt) resins. At its fully cured stage, BA-35x’s Tg and degradation temperature were reported to exhibit the values much greater than those of BA-a polymer due to the regioselectivity of the benzoxazine polymerization in the aromatic amine-based polybenzoxazines