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Bromine (BRP) or chlorine modified Phenolic resins (CLP) were prepared by the reaction of paraharogenated phenol-phenol mixtures with formaldehyde. Boron modified Phenolic resins (PBP) were prepared by the esterification of boric acid with phenol, followed by the polycondensation with paraformaldehyde. The flame retardance of the modified resins was evaluated in comparison with the unmodified resin (GP) by the measurement of oxygen index, and found to be in the order: BRP>PBP>CLP> GP. The higher was the heat-treatment temperature, the higher was the heat distortion temperature (HDT) of resin. The HDT of resin was in the order: PBP, GP>BRP>CLP. This order was the same as the results of flexual properties. The resistance against thermooxidative degradation of the resins was examined by means of thermogravimetry and differential thermal analysis, and the higher resistance was observed by the order of PBP>GP•àCLP•âBRP. キ ー ・ワー ド:ハ ロゲ ン変 性 フ ェ ノー ル樹 脂,ホ ウ酸 フ ェニ ル樹 脂,耐 燃 性,耐 熱 性,耐 酸 化 熱 分 解 性

Bromine, chlorine and boron modified phenolic resins with excellent flame retardance and thermal stability.