Transactions of The Japan Institute of Electronics Packaging
Online ISSN : 1884-8028
Print ISSN : 1883-3365
ISSN-L : 1883-3365
Technical Papers
Low Dk/Df Polyimide Adhesives for Low Transmission Loss Substrates
Takashi TasakiAtsushi ShiotaniTakashi YamaguchiKeisuke Sugimoto
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2018 Volume 11 Pages E17-006-1-E17-006-7


We developed solvent-soluble polyimides with good heat resistance and low dielectric constant (Dk)/dissipation factor (Df) characteristics by optimizing the composition ratio of the aliphatic, cycloaliphatic, and aromatic groups present in the polyimide back bone. We found that the adhesives prepared using our polyimides showed good adhesion to polyimide films and low profile copper foils and low Dk/Df. Furthermore, we developed a three-layer flexible copper clad laminate (3LFCCL) with our polyimde (PI) adhesives, low-pofile copper foils, and normal PI films. This 3LFCCL showed a transmission loss similar to that of liquid crystal polymer (LCP) FCCLs at frequencies less than 20 GHz. This result indicates that by using our PI adhesives, lower cost FCCLs can be prepared, which can then be used as high-frequency substrates.

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© 2018 The Japan Institute of Electronics Packaging
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