Silicone-modified epoxy resin and composition

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PROBLEM TO BE SOLVED : To provide epoxy resin having excellent pot life and also offering high transparency and moderate Tg, and a composition thereof and a cured product thereof.SOLUTION : This invention provides silicone modified epoxy resin (A) represented by the formula (1) (in the formula (1), R, R, R, R, R, and Rare the same or different 1-6C hydrocarbon group, at least one of R-Rbeing a group having a 1-alkyl-1, 2-epoxy cyclohexyl group and indicating a/(a+b+c+d)=0.0-1.0, b/(a+b+c+d)=0.0-1.0, c/(a+b+c+d)=0.0-1.0, d/(a+b+c+d)=0-0.5).