| 摘要 |
<p>A brominated polyphenylene oxide having a molecular skeleton obtained by condensing tribromophenols and satisfying the requirements: (A) its 20 wt.% solution in chloroform has an absorbance at 600 nm of not larger than 0.6; (B) when 50 ml of ion-exchanged water is added to its 1.00 g/30 ml solution in dioxane, the resulting solution has an electroconductivity of not larger than 10 mu S/cm measured at 25 DEG C; and (C) when a mixture comprised of 20 % by weight of the brominated polyphenylene oxide and 80 % by weight of triphenyl phosphate is heated at 280 DEG C for 20 minutes, the halide ion increase therein is not larger than 10 mu mols per gram of the brominated polyphenylene oxide, is used as a flame retardant. When it is added to resin, the resin moldings are excellent in its flame retardancy, electric properties, physical properties, thermal stability and appearance (color hue), and they do not corrode molds.</p> |
