| 摘要 |
<p>Diepoxides of the general formula: <IMAGE> <IMAGE> wherein n has an average value not exceeding 0.03 and R is the bisphenyl radical of bisphenol-A are recovered from an epoxy resin of the same general formula with n varying from 0.07 to 0.30, by removing the low-boiling substance from the epoxy resin at 0.1-1 mm Hg and 165 DEG -200 DEG C and distilling off said diepoxide from the thus treated epoxy resin at 0.1-0.005 mm Hg and a temperature not exceeding 240 DEG C. The low viscosity, narrow molecular weight distribution and excellent purity of these diepoxides allow their use in critical application fields.</p> |
