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|1. (WO2018181597) MOUNTING STRUCTURE MANUFACTURING METHOD AND SHEET MATERIAL USED IN THE SAME|
|Applicants:||NAGASE CHEMTEX CORPORATION
|Title:||MOUNTING STRUCTURE MANUFACTURING METHOD AND SHEET MATERIAL USED IN THE SAME|
[Problem] To suppress the generation of ionic impurities from a sheet material even in an environment like that of a high temperature, high humidity bias test. [Solution] A method for manufacturing a mounting structure, the method comprising: a step for preparing a mounting member that is provided with a first circuit member and a plurality of second circuit members to be loaded on the first circuit member, and that has a space formed between the first circuit member and the second circuit members; a step for preparing a sheet material containing a thermosetting resin, a curing agent, a thermoplastic resin, and an inorganic filler; a step for disposing the sheet material on the mounting member so as to face the second circuit members; and a sealing step for pressing the sheet material against the first circuit member, heating the sheet material, and sealing the second circuit members while maintaining the space. The total of chloride ions, sodium ions, and potassium ions contained in the thermoplastic resin is 30 ppm or less on a mass basis.