Process for preparing resin impregnated substrates for use in preparing electrical laminates

摘要

The preparation of substrates impregnated with epoxy resins and curing agents therefor is improved by employing as the epoxy resin one which has been prepared by reacting a low equivalent weight epoxy resin such as a diglycidyl ether of bisphenol A with a dihydric phenolic compound such as tetrabromo bisphenol A in the presence of a quaternary ammonium hydroxide such as tetramethyl ammonium hydroxide.