| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a solder resist which enables to have both adequate sensitivity during exposure and alkali developability, is excellent in dimensional stability against temperature change, does not exhibit brittleness, and enables to obtain a cured product which is excellent in water resistance, electrical insulation, temperature cycle resistance (TCT resistance) and the like, a dry film having a solder resist layer, a cured product and a printed wiring board. <P>SOLUTION: The solder resist contains an acid-modified vinyl ester which is synthesized from an epoxy compound, a phenol compound, an unsaturated monobasic acid and a polybasic acid anhydride, while using a crystalline epoxy resin having a melting point of ≥90°C as at least a part of the epoxy compound and using a compound having a bisphenol S skeleton as at least a part of the phenol compound. <P>COPYRIGHT: (C)2009,JPO&INPIT |
