CAP FOR CONTAINER

The closing cap 1 for a container comprises a lateral wall 3 extending around an axis Z and a transversal wall 4 positioned at one end of the lateral wall. A separating line 5 is provided on the lateral wall to define a retaining ring 301, which comprises a retaining portion 303 which extends as far as a free edge 304 of the retaining ring and is configured to internally engage with a locking ring of a neck of the container in such a way as to remain anchored to the neck, and a closing element 302 which can removably engage with the neck, so as to open or close the container. The cap additionally comprises an incision line 7 also provided on the lateral wall to define, together with the separating line, at least one connecting band 306, 307 for connecting the closing element and the retaining portion to each other. The cap comprises: a coupling structure 2 positioned inside the lateral wall for removably coupling the closing element to the neck of the container, the lateral wall having a first portion 309, without the coupling structure and on which the separating line and the incision line are made, which has a first height T1 measured along an axis parallel to the axis starting from the free edge, and a second portion 310 provided with the coupling structure, which has a second height T2 measured along an axis parallel to the axis starting from the transversal wall. The ratio between the second height and the first height is less than or equal to 2.00 so that the connecting band can be made in the first portion with suitable dimensions.