ポリカーボネートの合成に関する研究(第2報)

原料の純度,精製について

抄録

The refining methods and purities of bisphenol A, methylene chloride and phosgene as the raw materials for polycarbonate have been investigated in relation to condensation-polymerization reaction. For obtaining the colorless, transparent high polymer easy for washing after the completion of the reaction with good yield, the following procedures are necessary:1) Bisphenol A should be recrystallized from solvent, such as xylene, to white and, highly pure form.2) Methylene chloride should not contain large amount of molecular weight modifier such as methanol.3) Highly pure phosgene must be used with the lesat amount of chlorine and hydrochloric acid.