Epoxy Resin, Method for Producing Same and Epoxy Resin Composition Thereof
An epoxy resin represented by general formula (I) satisfying numerical formula (1) with hydrolytic halogen of 0.05 wt. % or less, said epoxy resin produced as follows: after dissolving 0.8 to 1.3 mole of epihalohydrin to 1 mole of divalent phenol in a solvent, a pre-reaction is performed over 30 to 70 minutes by adding dropwise 0.25-0.35 mole of 30˜50% aqueous solution of alkali metal hydroxide over 30 to 70 minutes thereto, and thereafter, 0.65-0.75 mole of the remaining 30˜50% aqueous solution of alkali metal hydroxide is added dropwise over about 1 hour to complete the reaction over 1 to 3 hours. 0.5≦ X/Y ≦1.5 Numerical formula (1)
1 . An epoxy resin represented by general formula (I), which satisfies numerical formula (1) mentioned below and comprises hydrolytic halogen of 0.05 wt. % or less, said epoxy resin being produced by the procedure as follows: after dissolving 1.03 to 1.10 mole of epihalohydrin to 1 mole of divalent phenol in a solvent, a pre-reaction is performed over 30 to 70 minutes by adding dropwise 0.25-0.35 mole of 30˜50% aqueous solution of alkali metal hydroxide over 30 to 70 minutes thereto, and thereafter, 0.65-0.75 mole of the remaining 30˜50% aqueous solution of alkali metal hydroxide is added dropwise over about 1 hour to complete the reaction over 1 to 3 hours.
wherein n is an integer of 0 or more;
A 1 and A 2 are residue of divalent phenol, and can be same or different;
both R 1 and R 2 are H or
0.5 ≦X/Y≦ 1.5 Numerical formula (1)
wherein,
X: epoxy equivalent (g/eq);
Y: phenolic hydroxyl group equivalent (g/eq).
2 . The epoxy resin of claim 1 wherein divalent phenols is bisphenols.
3 . The epoxy resin of claim 1 wherein epoxy equivalent of the resin is 3000 g/eq or less and phenolic hydroxyl group equivalent of the resin is 5000 g/eq or less.
4 . An epoxy resin composition comprising, containing epoxy resin according to claim 1 as an essential component.