| 摘要 |
<P>PROBLEM TO BE SOLVED: To realize an aqueous coating agent for an electronic component-packaged substrate, which precludes generation of blistering referred to as popping on a coating surface. Ž<P>SOLUTION: The foaming generated on the coating surface can be reduced by adding 50-500 ppm by weight of aqueous fluorine-based aqueous oil repellent agent as a solid content to an aqueous coating agent 3 containing a thermoplastic elastomer as a main component and drying the electronic component-packaged substrate coated with the aqueous coating 3 at 100°C or higher for five minutes. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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