| abstract |
In an underfill material for a sheet, an adhesive film for underfill that can increase the glass transition temperature without impairing flexibility. An epoxy resin having a number average molecular weight of 600 or less, a phenol resin having a number average molecular weight exceeding 500, and a resin component containing an elastomer, wherein the content of the epoxy resin in the resin component is 5 to 50% by weight. An adhesive film for underfill in which the content of the phenol resin is 5 to 50% by weight and the content of the elastomer is 10 to 40% by weight. The hydroxyl equivalent of the phenol resin is 200 g / eq or more. [Selection figure] None |