A closure assembly comprising: - a neck, which in turn comprises: - a first threaded surface, and - a coupling element located on the bottom of the first threaded surface to support and couple a coupling which acts as a security seal, and - a closure cap linked to the neck which in turn comprises: - a lower base intended to surround the outside of the neck, which has: - an external face, and - an internal face intended to stay facing the neck, which has a second threaded surface on which the coupling is located, able to be coupled to the first threaded surface in order to establish a threaded coupling between the neck and the cap with the container, and - an upper cover, linked in an articulated manner to the base, and wherein the second threaded surface comprises a plurality of projections aligned and separated from each other, the closure cap being characterised in that the projections have first (α) and second (β) inclination angles, defined between the respective perimeter edges thereof and a central axis of rotation which is perpendicular to the center of the cap and wherein these inclination angles (α, β) define an angular contact between the first and the second threaded surfaces such that it enables, during the elaboration of the closure assembly, the application of a torque which ensures a correct seal between the neck and the cap, therefore preventing the separation thereof and accidental spilling of the housed liquid, and wherein said angles (α, β) further collaborate in an interaction that causes jumps between threaded surfaces (3,6) that cause the cap to rotate freely with respect to the neck, whereon it is thus retained. - a neck, which in turn comprises: - a first threaded surface, and - a coupling element located on the bottom of the first threaded surface to support and couple a coupling which acts as a security seal, and - a first threaded surface, and - a coupling element located on the bottom of the first threaded surface to support and couple a coupling which acts as a security seal, and - a closure cap linked to the neck which in turn comprises: - a lower base intended to surround the outside of the neck, which has: - an external face, and - an internal face intended to stay facing the neck, which has a second threaded surface on which the coupling is located, able to be coupled to the first threaded surface in order to establish a threaded coupling between the neck and the cap with the container, and - an upper cover, linked in an articulated manner to the base, and wherein the second threaded surface comprises a plurality of projections aligned and separated from each other, the closure cap being characterised in that the projections have first (α) and second (β) inclination angles, defined between the respective perimeter edges thereof and a central axis of rotation which is perpendicular to the center of the cap and wherein these inclination angles (α, β) define an angular contact between the first and the second threaded surfaces such that it enables, during the elaboration of the closure assembly, the application of a torque which ensures a correct seal between the neck and the cap, therefore preventing the separation thereof and accidental spilling of the housed liquid, and wherein said angles (α, β) further collaborate in an interaction that causes jumps between threaded surfaces (3,6) that cause the cap to rotate freely with respect to the neck, whereon it is thus retained. - a lower base intended to surround the outside of the neck, which has: - an external face, and - an internal face intended to stay facing the neck, which has a second threaded surface on which the coupling is located, able to be coupled to the first threaded surface in order to establish a threaded coupling between the neck and the cap with the container, and - an external face, and - an internal face intended to stay facing the neck, which has a second threaded surface on which the coupling is located, able to be coupled to the first threaded surface in order to establish a threaded coupling between the neck and the cap with the container, and - an upper cover, linked in an articulated manner to the base, and wherein the second threaded surface comprises a plurality of projections aligned and separated from each other, the closure cap being characterised in that the projections have first (α) and second (β) inclination angles, defined between the respective perimeter edges thereof and a central axis of rotation which is perpendicular to the center of the cap and wherein these inclination angles (α, β) define an angular contact between the first and the second threaded surfaces such that it enables, during the elaboration of the closure assembly, the application of a torque which ensures a correct seal between the neck and the cap, therefore preventing the separation thereof and accidental spilling of the housed liquid, and wherein said angles (α, β) further collaborate in an interaction that causes jumps between threaded surfaces (3,6) that cause the cap to rotate freely with respect to the neck, whereon it is thus retained.