Patent ID: 7884172
Filing Date: 2011-02-08
Classification: C08G

Abstract:
1. An epoxy resin obtained by glycidylating a phenol compound which contains 1,1,2,2-tetrakis(hydroxyphenyl)ethane in an amount of 95% by area or more based on the measurement by gel permeation chromatography with epihalohydrin in the presence of an alcohol selected from the group consisting of methanol, ethanol, propyl alcohol and butanol, and in the presence of an alkali metal hydroxide, recovering excess epihalohydrin with heating at from 40 to 140° C. under reduced pressure leaving the solution with a resin concentration of 40 to 90% by weight, adding a water-soluble solvent selected from the group consisting of acetone, ethyl lactate, methanol, ethanol, isopropanol, n-propanol, n-butanol and t-butanol to prepare a water-soluble solution or suspension, and adding water in an amount of 20 to 500% by weight based on the theoretical yield of the epoxy resin to precipitate out the crystals of the epoxy resin, wherein the content proportion of a tetranuclear species consisting of 1,1,2,2-tetrakis(glycidyloxyphenyl)ethane is 50 to 90% by area, and the content proportion of an octanuclear species represented by the following formula (2): wherein G represents a glycidyl group, is 5% by area or more, both based on the measurement by gel permeation chromatography, and the total chlorine content is 5000 ppm or less, and the amount of solvent is 500 ppm or less.