Thin laminate as embedded capacitance material in printed circuit boards
The invention concerns multilayered structures useful for forming capacitors, which may be embedded within printed circuit boards or other microelectronic devices. The multilayered structure comprises a pair of parallel electrically conductive layers separated by a pair of dielectric layers and a central polymerizable layer. Each of the dielectric layers and the central layer may include a filler. Capacitors formed from the multilayered structures of the invention exhibit excellent short circuit resistance as well as excellent void resistance.
1. A multilayered construction suitable for forming capacitors which comprises:
a) a first electrically conductive layer, having first and second surfaces;
b) a first thermosetting polymer layer, having first and second surfaces, on the first electrically conductive layer with the first surface of the first thermosetting polymer layer on the second surface of the first electrically conductive layer;
c) a central polymerizable layer, having first and second surfaces, on the first thermosetting polymer layer with the first surface of the central polymerizable layer on the second surface of the first thermosetting polymer layer, which central polymerizable layer comprises a polymerizable precursor of a polyethylene terephthalate, a polyethylene naphthalate, a polyvinyl carbazole, a polyphenylene sulfide, an aromatic polyamide, a polyether-nitrile, a polyether-ether-ketone, or combinations thereof;
d) a second thermosetting polymer layer, having first and second surfaces, on the central polymerizable layer with the first surface of the second thermosetting polymer layer on the second surface of the second surface of the central polymerizable layer; and
e) a second electrically conductive layer, having first and second surfaces, on the second thermosetting polymer layer with the first surface of the second electrically conductive layer on the second surface of the second thermosetting polymer layer;
wherein each of said first thermosetting polymer layer, said second thermosetting polymer layer and said central polymerizable layer optionally further comprises a filler material.
2. The multilayered construction of claim 1 wherein at least one of said first thermosetting polymer layer, said second thermosetting polymer layer and said central polymerizable layer further comprises a filler material.
3. The multilayered construction of claim 1 wherein each of said first thermosetting polymer layer, said second thermosetting polymer layer and said central polymerizable layer further comprises a filler material.
4. The multilayered construction of claim 1 wherein one or both of the first thermosetting polymer layer and the second thermosetting polymer layer comprise a material selected from the group consisting of an epoxy, a melamine, polyesters, polyester containing copolymers, a urethane, alkyd, a bis-maleimide triazine, a polyimide, an ester, polyarylene ethers, fluorinated polyarylene ethers, benzocyclobutenes, liquid crystal polymers, an allyated polyphenylene ethers, amines and combinations thereof.
5. The multilayered construction of claim 1 wherein each of said first and second thermosetting polymer layers comprise an epoxy.
6. The multilayered construction of claim 1 wherein each of said first and second thermosetting polymer layers comprise an epoxy and a filler.
7. The multilayered construction of claim 1 wherein said central polymerizable layer comprises a polymerizable polyamide precursor.
8. The multilayered construction of claim 1 wherein each of the first electrically conductive layer and second electrically conductive layer comprises copper.