Non-flaking capacitor material, capacitive substrate having an internal capacitor therein including said non-flaking capacitor material, and method of making a capacitor member for use in a capacitive substrate
A capacitor material including a thermosetting resin (e.g., epoxy resin), a high molecular mass flexibilizer (e.g., phenoxy resin), and a quantity of nano-particles of a ferroelectric ceramic material (e.g., barium titanate), the capacitor material not including continuous or semi-continuous fibers (e.g., fiberglass) as part thereof. The material is adapted for being positioned in layer form on a first conductor member and heated to a predetermined temperature whereupon the material will not possess any substantial flaking characteristics. A second conductor member may then be positioned on the material to form a capacitor member, which then may be incorporated within a substrate to form a capacitive substrate. Electrical components may be positioned on the substrate and capacitively coupled to the internal capacitor.
1 . A capacitor material comprising a thermosetting resin, a high molecular mass flexibilizer, and a quantity of nano-particles of a ferroelectric ceramic material, said capacitor material not including continuous or semi-continuous fibers as part thereof and being adapted for being positioned in layer form on a first conductor member and heated to a predetermined temperature whereupon said material will not possess any substantial flaking characteristics, and thereafter adapted for having a second conductor member positioned thereon to form a capacitor member.
2 . The capacitor material of claim 1 wherein said thermosetting resin is selected from the group consisting of epoxy resin, high temperature diglycidyl ether, polyimide, cyanate ester (triazines), bismaleimide, bismaleimide and epoxy modified blend, benzoxazine, epoxy modified benzoxazine, halogen free benzoxazine, fluoropolymer, benzocyclobutene, perfluorobutane, polyphenylenesulfide, polysulfone, polyetherimide, polyetherketone, polyphenylquinoxaline, polybenzoxazole, polyphenyl benzobisthiazole and combinations thereof.
3 . The capacitor material of claim 1 wherein said high molecular mass flexibilizer is selected from the group consisting of phenoxy resin, oligomeric resin and polymeric resin.
4 . The capacitor material of claim 3 wherein said high molecular mass flexibilizer is phenoxy resin and comprises from about five to twenty percent by weight of said capacitor material.
5 . The capacitor material of claim 1 wherein said ferroelectric ceramic material is selected from the group consisting of barium titanate, substituted barium titanate, strontium titanate, lead titanate, lead zirconate titanate, substituted lead zirconate titanate, lead magnesium niobate, lead zinc niobate, lead iron niobate, solid solutions of lead magnesium niobate and lead titanate, solid solutions of lead zinc niobate and lead titanate, lead iron tantalite, other ferroelectric tantalates, and combinations or mixtures thereof.
6 . The capacitor material of claim 5 wherein said ferroelectric ceramic material is barium titanate and comprises less than about eighty percent by weight of said capacitor material.
7 . The capacitor material of claim 1 wherein said first conductor member comprises a layer of copper or copper alloy material.
8 . The capacitor material of claim 7 wherein said second conductor member comprises a layer of copper or copper alloy material.
9 . A capacitive substrate comprising:
a plurality of dielectric layers and a plurality of conductor layers; and
an internal capacitor positioned within said capacitive substrate, said internal capacitor including a first conductor member, a capacitor material positioned on said first conductor member and including a thermosetting resin, a high molecular mass flexibilizer, and a quantity of nano-particles of a ferroelectric ceramic material, said capacitor material not including continuous or semi-continuous fibers as part thereof and being adapted for being positioned in layer form on a first conductor member and heated to a predetermined temperature whereupon said material will not possess any substantial flaking characteristics, and a second conductor member positioned on said capacitor material.
10 . The capacitive substrate of claim 9 wherein the dielectric material of at least one of said dielectric layers is selected from the group consisting of fiberglass-reinforced epoxy resins, polytetrafluoroethylene, polyimide, polyamide, cyanate resin, photo-imageable material, bismaleimide, benzoxazine, halogen-free resin and combinations thereof.
11 . The capacitive substrate of claim 9 wherein at least one of said conductor layers is comprised of copper or copper alloy material.
12 . The capacitive substrate of claim 9 wherein said thermosetting resin of said internal capacitor is selected from the group consisting of epoxy resin, high temperature diglycidyl ether, polyimide, cyanate ester (triazines), bismaleimide, bismaleimide and epoxy modified blend, benzoxazine, epoxy modified benzoxazine, halogen free benzoxazine, fluoropolymer, benzocyclobutene, perfluorobutane, polyphenylenesulfide, polysulfone, polyetherimide, polyetherketone, polyphenylquinoxaline, polybenzoxazole, polyphenyl benzobisthiazole and combinations thereof.
13 . The capacitive substrate of claim 9 wherein said high molecular mass flexibilizer of said internal capacitor is selected from the group consisting of phenoxy resin, oligomeric resin and polymeric resin.
14 . The capacitive substrate of claim 13 wherein said high molecular mass flexibilizer of said internal capacitor is phenoxy resin and comprises from about five to twenty percent by weight of said capacitor material.
15 . The capacitive substrate of claim 9 wherein said ferroelectric ceramic material of said internal capacitor is selected from the group consisting of barium titanate, substituted barium titanate, strontium titanate, lead titanate, lead zirconate titanate, substituted lead zirconate titanate, lead magnesium niobate, lead zinc niobate, lead iron niobate, solid solutions of lead magnesium niobate and lead titanate, solid solutions of lead zinc niobate and lead titanate, lead iron tantalite, other ferroelectric tantalates, and combinations or mixtures thereof.
16 . The capacitive substrate of claim 5 wherein said ferroelectric ceramic material of said internal capacitor is barium titanate and comprises less than about eighty percent by weight of said capacitor material.
17 . The capacitive substrate of claim 9 wherein said first conductor member of said internal capacitor comprises a layer of copper or copper alloy material.
18 . The capacitive substrate of claim 17 wherein said second conductor member of said internal capacitor comprises a layer of copper or copper alloy material.
19 . The capacitive substrate of claim 9 further including an electrical component positioned on said capacitive substrate and electrically coupled to said internal capacitor, said electrical component and said internal capacitor forming an electrical assembly.
20 . A method of making a capacitor member for use within a capacitive substrate, said method comprising;
providing a first conductor member;
positioning a quantity of capacitor material on said first conductor member, said quantity of capacitor material including a thermosetting resin, a high molecular mass flexibilizer, and a quantity of nano-particles of a ferroelectric ceramic material but not including continuous or semi-continuous fibers as part thereof,
heating said quantity of capacitor material on said first conductor member to a predetermined temperature for a predetermined time period such that said capacitor material will not possess any substantial flaking characteristics; and
thereafter positioning a second conductor member on said quantity of capacitor material.
21 . The method of making a capacitor member of claim 20 wherein said first conductor member is provided in the form of a copper or copper alloy layer.
22 . The method of making a capacitor member of claim 20 wherein said second conductor member is provided in the form of a copper or copper alloy layer.
23 . The method of making a capacitor member of claim 20 wherein said positioning of said quantity of capacitor material on said first conductor member is accomplished using a coating process.
24 . The method of making a capacitor member of claim 23 wherein said positioning of said second conductor member on said quantity of capacitor material is accomplished using lamination.
25 . The method of making a capacitor member of claim 20 wherein said heating of said quantity of capacitor material on said first conductor member to a predetermined temperature comprises heating said capacitor material to a temperature within the range of from about 120 degrees C. to about 140 degrees C.
26 . The method of making a capacitor member of claim 25 wherein said heating of said quantity of capacitor material on said first conductor member for said predetermined time period comprises heating said capacitor material for a time period of from about two to about four minutes.