Closing cap for a container

A closing cap for a container, comprising a lateral wall extending around an axis and a transversal wall positioned at one end of the lateral wall, an intended separating line being provided on the lateral wall to define:

• a retaining ring, which is configured to remain anchored to a neck of the container and extends as far as a free edge;
• a closing element removably engageable with the neck, so as to open or close the container;
• wherein the cap comprises a joining zone which extends circumferentially for an angle, in which the retaining ring and the closing element are joined;
• wherein the retaining ring comprises an engaging element which projects inwards and has an initial end, which is placed on the free edge, or near the free edge, and a final end, which is configured to engage with a stop ring of the neck;
• wherein the initial end of the engaging element comprises a weakened portion, which extends circumferentially at least in said angle, such that it defines a deformable band in the retaining ring capable of separating from the engaging element and facilitating a passage from a closed condition to an open condition of the cap.