Circuit material and circuit board containing the same

A circuit material, comprising a conductive metal layer and a dielectric substrate layer, and an adhesive layer arranged between the conductive metal layer and the dielectric substrate layer,

• wherein the adhesive layer is made of a material which comprises an adhesive composition;
• wherein the adhesive composition comprises a resin component and a non-resin component;
• wherein the resin component is composed of unsaturated polyphenylene ether resin, SBS resin and maleimide resin;
• and the non-resin component comprises an initiator;
• the adhesive layer is obtained by applying the adhesive composition dissolved in a solvent onto the surface of the conductive metal layer or the dielectric substrate layer in the form of a solution, or by applying to a release material and removing the release material after partially curing or completely curing;
• wherein the SBS resin has a number average molecular weight of 5,000-50,000, the SBS resin has a side chain vinyl content of 60-99 mol. %, the SBS resin has a styrene unit content of 35-55 mol. %;
• wherein the circuit material obtained by curing the dielectric circuit substrate layer and the adhesive layer has dielectric constant at 1-10 GHz of 3.36 to 3.68, and dielectric loss factor of 0.0029-0.0038;
• and
• wherein the adhesive layer has a grammage of 2-40 g/m2.