| abstract |
(57) [Summary] [Purpose] To synthesize a p-substituted phenol-modified phenol resin with excellent heat resistance and oxidation resistance. [Composition] Phenols (Ph), p-substituted phenols (PP) and formaldehyde (F), Ph and PP So that Ph is 95 to 20 mol% and PP is 5 to 80 mol%, and the reaction molar ratio is {F / (Ph + P P)} is in the range of 0.5 to 2.0, and a metal element selected from the group consisting of transition metals, IIA group elements, IIIA group elements, IVA group elements, VA group elements and VIA group elements. And react in the presence of acid. |