Epoxy resins and process for preparing the same.

摘要

A epoxy resin of the general formula:
<CHEM>
wherein X1 and X2 are -OH or
<CHEM>
and X3 is -OH,
<CHEM>
or a group of the general formula:
<CHEM>
in which X4, X5, and X6 are -OH or
<CHEM>
provided that at least one of X1 to X6 is
<CHEM>

<??>The epoxy resin is prepared by reacting gallic acid or tannic acid with an epihalohydrin in the presence of a phase transfer catalyst and reacting the obtained reaction mixture with an aqueous alkali solution.