A conductive system and a method of forming an insulator for use in the conductive system is disclosed. The conductive system comprises a foamed polymer layer on a substrate. The foamed polymer layer has a surface that is hydrophobic, and a plurality of conductive structures are embedded in the foamed...http://www.google.fr/patents/US6838764?utm_source=gb-gplus-shareBrevet US6838764 - Insulators for high density circuits
