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An adhesive for a circuit material, comprises a blend of a cure system; and a solid epoxy resin and a nitrile rubber functionalized with epoxy-reactive groups, wherein the solid epoxy resin and the nitrile rubber are reacted to form an adduct prior to blending with the cure system. The adhesive has

An adhesive for a circuit material, comprises a blend of a cure system; and a solid epoxy resin and a nitrile rubber functionalized with epoxy-reactive groups, wherein the solid epoxy resin and the nitrile rubber are reacted to form an adduct prior to blending with the cure system. The adhesive has low dendritic growth and improved solder resistance.

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What is claimed is: 1. A circuit material, comprising an adhesive layer, wherein the adhesive layer comprises the reaction product of a blend comprising: a cure system; and an adduct, wherein a solid epoxy resin and a functional group-containing nitrile rubber, wherein the nitrile rubber is liquid,

What is claimed is: 1. A circuit material, comprising an adhesive layer, wherein the adhesive layer comprises the reaction product of a blend comprising: a cure system; and an adduct, wherein a solid epoxy resin and a functional group-containing nitrile rubber, wherein the nitrile rubber is liquid, are pre-reacted to form the adduct prior to blending the adduct with the cure system and wherein greater than 75% of the functional groups in the functional group-containing nitrile rubber are reacted with the epoxy groups of the solid epoxy resin. 2. The circuit material of claim 1, further comprising a release film disposed on a side of the adhesive layer. 3. The circuit material of claim 2, further comprising a second release film disposed on a side of the adhesive layer opposite the first release film. 4. The circuit material of claim 1, further comprising a polymeric dielectric layer disposed on a side of the adhesive layer. 5. The circuit material of claim 1, further comprising a conductive layer disposed on a side of the adhesive layer. 6. The circuit material of claim 1, wherein the conductive layer is copper. 7. The circuit material of claim 1, wherein the functional groups in the functional group-containing nitrile rubber are carboxy groups. 8. The circuit material of claim 1, wherein the nitrile rubber has a low ionic content. 9. The circuit material of claim 1, wherein the nitrile rubber is manufactured using solution polymerization. 10. The circuit material of claim 1, wherein the blend is halogen-free. 11. The circuit material of claim 1, wherein the blend further comprises 1 to 20 parts by weight of a carboxy-functionalized nitrile rubber. 12. The circuit material of claim 10, wherein the blend further comprises alumina trihydrate and/or an aluminum phosphinate salt. 13. The circuit material of claim 1, wherein the blend is an adhesive composition consisting essentially of the adduct, or the adduct and an optional epoxy resin, with the remainder being flame retardants and other additives. 14. The circuit material of claim 1, wherein the blend further comprises an optional epoxy resin that is not in the adduct. 15. The circuit material of claim 1, comprising up to 20 parts by weight of the adduct. 16. The circuit material of claim 14, wherein the blend comprises 40 to 99 parts by weight of the adduct and 1 to 35 parts by weight of the optional epoxy resin that is not in the adduct. 17. The circuit material of claim 1, wherein the adhesive layer is B-staged. 18. A circuit material, comprising a polymeric dielectric layer; a first adhesive layer disposed on a first side of the dielectric layer; and a second adhesive layer disposed on a side of the dielectric layer opposite the first adhesive layer, wherein the first, second, or both adhesive layers comprise a halogen-free blend of, the blend comprising: a cure system; and an adduct, wherein a solid epoxy resin and a functional group-containing liquid nitrile rubber functionalized with epoxy-reactive carboxy groups are pre-reacted to form the adduct prior to blending the adduct with the cure system and wherein greater than 75% of the functional groups in the functional group-containing nitrile rubber are reacted with the epoxy groups of the solid epoxy resin. 19. The circuit material of claim 18, further comprising a first release film disposed on a side of the adhesive layer opposite the polymeric dielectric layer and a second release film disposed on a side of the second adhesive layer opposite the dielectric layer. 20. A circuit material, comprising a first and a second conductive layer; a polymeric dielectric layer; and a first and a second adhesive layer, wherein the first adhesive layer is disposed between the first conductive layer and a first side of the dielectric polymer layer, the second adhesive layer is disposed between the second conductive layer and a second side of the dielectric layer, and further wherein the first, second, or both adhesive layers comprise the reaction product of a blend comprising: a cure system; and an adduct, wherein a solid epoxy resin and a functional group-containing nitrile rubber, wherein the nitrile rubber is liquid and functionalized with epoxy-reactive groups are pre-reacted to form the adduct prior to blending the adduct with the cure system and wherein greater than 75% of the functional groups in the functional group-containing nitrile rubber are reacted with the epoxy groups of the solid epoxy resin. 21. The circuit material of claim 20, wherein the polymeric dielectric layer comprises polyimide. 22. The circuit material of claim 20, wherein the adhesive layer is fully cured. 23. A circuit comprising the circuit material of claim 1. 24. A circuit comprising the circuit material of claim 18. 25. A circuit comprising the circuit material of claim 20. 26. A method of forming a circuit material, comprising disposing a layer of an adhesive material onto a conductive layer, a release layer, or a polymeric dielectric layer, wherein the adhesive material comprises a blend comprising: a cure system; and an adduct, wherein a solid epoxy resin and a functional group-containing nitrile rubber, wherein the nitrile rubber is liquid and is functionalized with epoxy-reactive groups, are pre-reacted to form the adduct prior to blending the adduct with the cure system and wherein greater than 75% of the functional groups in the functional group-containing nitrile rubber are reacted with the epoxy groups of the solid epoxy resin. 27. The method of claim 26, further comprising partially curing the disposed adhesive material. 28. The method of claim 26, further comprising fully curing the disposed adhesive material.