SEALING MATERIAL SHEET FOR ELECTRONIC DEVICE

To provide a sealing material sheet for an electronic device, which is a polyethylene system sealing material sheet, capable of resisting a long period use under an environment of a high temperature and high humidity, and which is suitable for a sealing material sheet for a solar battery module, or the like, capable of maintaining a power generation efficiency of the solar battery module by suppressing the generation of an acidic gas.SOLUTION: A sealing material sheet contains a hindered-amine light resistance stabilizer and a cross-linking agent by using a polyethylene-based resin as a base resin. All chemical structures of the hindered-amine light resistance stabilizer is a chemical structure of any one of following (i) to (iii): (i) a chemical structure not containing ester; (ii) a chemical structure containing ester, having a R1-COO-R2 structure, in which a molecular mass of R1 is 100 or more and R2 does not contain ester; and (iii) a chemical structure containing ester, having a R3-OCO-R4-COO-R5 structure, in which the molecular mass of R4 is 100 or more, and R3 and R5 do not contain ester.SELECTED DRAWING: Figure 1 【課題】高温多湿の環境下で長期使用にも耐えうるポリエチレン系の封止材シートであって、酸性ガスの発生を抑制して太陽電池モジュールの発電効率を維持できる太陽電池モジュール用封止材シート等に好適な電子デバイス用封止材シートを提供する。【解決手段】ポリエチレン系樹脂をベース樹脂とし、ヒンダードアミン系耐光安定剤と、架橋剤と、を含有し、ヒンダードアミン系耐光安定剤の化学構造が、いずれも以下の（ｉ）から（ｉｉｉ）のいずれかの化学構造である、封止材シート。（ｉ）エステルを含まない化学構造。（ｉｉ）エステルを含み、エステルが、Ｒ１−ＣＯＯ−Ｒ２構造であって、Ｒ１の分子量が１００以上であり、Ｒ２がエステルを含まない化学構造。（ｉｉｉ）エステルを含み、エステルが、Ｒ３−ＯＣＯ−Ｒ４−ＣＯＯ−Ｒ５構造であって、Ｒ４の分子量が１００以上であり、Ｒ３及びＲ５がエステルを含まない化学構造。【選択図】図１