| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve dielectric characteristics and to maintain other characteristics. <P>SOLUTION: When an epoxy resin composition is cured on an aluminum foil by heating at 200°C for 2 hours, the epoxy resin composition forms an ether bond, and the cured body satisfies the following (i) to (iii). (i) The dielectric constant (ε) at 1 GHz is ≥2.0 and ≤3.5. (ii) The dielectric loss tangent (tanδ) at 1 GHz is ≥0.002 and ≤0.02. (iii) In the analysis by the infrared absorption method at 25°C, where a peak indicating the stretching vibration of a carbon-carbon double bond is taken as a reference peak; the ratio of a peak intensity indicating the stretching movement of the ether bond to the reference peak is taken as I<SB POS="POST">1</SB>; and the ratio of a peak intensity indicating the stretching movement of the epoxy group to the reference peak is taken as I<SB POS="POST">2</SB>, I<SB POS="POST">1</SB>/I<SB POS="POST">2</SB>is ≥2. <P>COPYRIGHT: (C)2012,JPO&INPIT |
