Cap for container

A closing cap (1;

• 1′;
• 1″;
• 1′″) for a container, comprising a lateral wall (3) extending around an axis (Z) and a transversal wall (4) positioned at one end of the lateral wall (3), a separating line (5) being provided on the lateral wall (3) 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 (301) and is configured to internally engage with a stop ring of a neck of the container in such a way as to remain anchored to the neck, and a closing element (302) removably engageable with the neck, so as to open or close the container;
• the separating line (5) being circumferentially interrupted to define in the lateral wall (3) a joining zone (305) in which the retaining ring (301) and the closing element (302) are joined;
• the closing cap comprising an inner thread structure (314) positioned on the inside of the lateral wall (3) to engage with an outer thread structure of the neck and removably couple the closing element (302) to the neck of the container, the inner thread structure (314) extending in a spiral around the axis (Z) starting from a start (314a) placed near the separating line (5), wherein a median line (M) of the joining zone (305), along a line parallel to the axis (Z), is positioned circumferentially within a reference angular portion (α), wherein said reference angular portion (α) has an amplitude which is less than or equal to 60° around the axis (Z) and has a bisector plane (BP) which is defined by a first axis (T), parallel to the axis (Z), placed at the start (314a) of the inner thread structure (314) and a second axis (B) which is diametrically opposed to the first axis (T).