| 摘要 |
<p>Provided is a method for producing a phosphorus-containing epoxy resin which produces a cured product that has excellent low viscosity properties and that is flame resistant. Also provided are an epoxy resin composition comprising the phosphorus-containing epoxy resin obtained by said production method, and a cured product of the epoxy resin composition. The production method comprises reacting an epoxy resin (A), which is formed from at least one of an epoxy resin (a1) represented by general formula (1), an epoxy resin (a2) represented by general formula (3) and an epoxy resin (a3) represented by general formula (4), with an organophosphorus compound (B), which comprises an organophosphorus compound (b1) represented by general formula (5) and/or an organophosphorus compound (b2) represented by general formula (6), to produce a phosphorus-containing epoxy resin having an epoxy equivalent of 200 to 600 g/eq and a phosphorus content of 1 to 6 wt%. The hydroxyl group concentration of the epoxy resin (A) is 200 mEq/100 g or less, the total chlorine content is 0.4 wt% or less, and the a-diol content is 10 meg/100 g or less. The weight ratio range of the organophosphorus compound (b1) / the organophosphorus compound (b2) of the organophosphorus compound (B) is 50/50 to 100/0.</p> |
