| 摘要 |
<p>A flexible printed substrate is constituted of metallic foil and provided thereon a polyimide layer which is produced by forming a film of a polyamic acid varnish on the metallic foil, followed by imidating. The polyimide layer has a linear expansion coefficient of 10x10<-6> to 30x 10<-6> (1/K) and a softening point not more than the imidation temperature.</p> |
