Multi-layer article for flexible printed circuits
View Patent ↗Provided is a multi-layer article comprising an electrically conductive metal layer adheringly contacting the surface of a polymeric composite film less than 500 μm in thickness, having a surface, the polymeric composite film comprising a polymer and a plurality of surface-modified hexagonal boron nitride particles dispersed therewithin. A process of film casting onto a conductive metal layer is provided.
1. A multi-layer article comprising an electrically conductive metal layer adheringly contacting a surface of a polymeric composite film the polymeric composite film comprising a polymer and a plurality of surface-modified hexagonal boron nitride particles dispersed therewithin comprising hexagonal boron nitride particles having a surface and a substituted phenyl radical bonded to the surface, the substituted phenyl radical being represented by the structure:
wherein X is a radical selected from NH 2 —, HO—, R 2 OC(O)—, R 2 C(O)O—, HSO 3 —, NH 2 CO—, halogens, alkyl and substituted or unsubstituted aryl; wherein R 1 is hydrogen, alkyl or alkoxy, R 2 is hydrogen, alkyl, or substituted or unsubstituted aryl.
2. The multi-layer article of claim 1 wherein R 1 is hydrogen, and X is NH 2 —.
3. The multi-layer article of claim 1 wherein R 1 is hydrogen, and X is HO—.
4. The multi-layer article of claim 1 wherein the polymer is polyimide.
5. The multi-layer article of claim 1 wherein the polymer is a cured epoxy resin composition.
6. The multi-layer article of claim 1 wherein the surface-modified hexagonal boron nitride particles have a size within the range of 0.5 to 50 μm.
7. The multi-layer article of claim 6 wherein the surface-modified hexagonal boron nitride is present at a concentration of 30 to 70% by weight.
8. The multi-layer article of claim 1 wherein the electrically conductive metal layer is copper.
9. The multi-layer article of claim 1 wherein the electrically conductive metal layer is in the form of discrete conductive pathways.
10. The multi-layer article of claim 1 wherein, the polymeric composite film is less than 500 μm in thickness.