| abstract |
The present invention obtains a sealing material and a prepreg excellent in transparency, heat resistance, and toughness, and in particular, a sealing material and a prepreg having characteristics suitable for an optical member. The sealing material includes a polyfunctional acid anhydride obtained by reacting a polyol (A) or a polyol (B) with a nuclear hydrogenation trimellitic anhydride halide, or a mixture of a nuclear hydrogenation trimellitic anhydride halide and a trimellitic anhydride halide, the polyol (A) Containing at least 3 or more hydroxyl groups in one molecule, the polyol (B) being a group of the polyol (A) and a group selected from the group consisting of alkylene oxides, cyclic ethers, and cyclic esters The above reaction is carried out. |