Patent ID: 8393483

Claim:
A closure for sealingly closing a neck of a container comprising: a disc like top portion; an adjacent skirt with retaining means configured and operable to engage the neck of the container; and a sealing device, the sealing device comprising; a radially deformable side seal configured for engagement with an outer free surface of the neck of the container, the side seal includes: an annular base radially distanced from the skirt by a gap; an annular sealing ring arranged at a free end of the annular base, the sealing ring including an inwardly facing convex surface extending radially inwardly from an inner surface of the annular base and forming, when in an engaged position with the neck, a first sealing area with the outer free surface of the neck, and a blend arranged at the inside of the annular base, the blend including an arcuate inner surface extending between a substantially vertical inner surface of the annular base and a substantially horizontal inner surface of the disc like top portion interconnecting the annular base with the disc like top portion of the closure, the arcuate inner surface of the blend having a predetermined radius and forming, when the sealing device and neck are engaged, a second sealing area between an edge surface of the neck and the side seal, the arcuate inner surface of the blend is configured such that by interaction with the edge surface of the neck of the container, the side seal controllably deforms such that the inwardly facing convex surface of the annular sealing ring is pressed radially inward more firmly against the outer free surface of the neck.