| 摘要 |
PROBLEM TO BE SOLVED: To provide an underfill agent excellent in storage stability and viscosity characteristics. SOLUTION: The underfill agent contains (a) a polyethersulfone resin with a weight-average molecular weight of 30,000 or more and (b) an epoxy compound, and a content of (c) a solvent is 1 wt.% or less. COPYRIGHT: (C)2011,JPO&INPIT
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