Absorbent core

An absorbent core for use in a disposable absorbent article having a upper surface and a lower surface, a front portion, a rear portion and a crotch portion, two longitudinal edges and two transverse edges, wherein the absorbent core is formed of three layers:

• an upper layer, an intermediate layer and a lower layer, such that:
• the upper and lower layers are comprised by a homogeneous mixture of fibers of absorbent material and particles of superabsorbent material and the particles of superabsorbent material are present in the upper and lower layers in a concentration lower than 25% by weight, wherein the upper and lower layers are not comprised 100% by fibers of absorbent material,
• the intermediate layer is comprised by fibers of absorbent material homogeneously mixed with particles of superabsorbent material and has three zones with different specific weights:
• an acquisition-distribution zone;
• one or more transition zones;
• and one or more anti-leakage zones, in which the specific weight in g/m2 of absorbent material plus superabsorbent material of the acquisition-distribution zone of the intermediate layer is 75% to 100% greater than the specific weight in g/m2 of absorbent material plus superabsorbent material of the one or more anti-leakage zones, the specific weight in g/m2 of absorbent material plus superabsorbent material of the acquisition-distribution zone of the intermediate layer is 30 to 50% greater than an average specific weight of absorbent material plus superabsorbent material of the one or more transition zones, and the specific weight expressed in g/m2 of superabsorbent material plus absorbent material of the one or more transition zones of the intermediate layer gradually decreases towards the transverse edges of the core.