Patent ID: 8720715

Claim:
A closure cap for tight connection with a container in material-locking fashion, which container contains a medical substance, having an essentially cup-shaped outer part of thermoplastic with at least one tightly covered, exposable penetration opening on a face end and with a sealing element of a soft plastic, covering the penetration opening on the inside of the outer part, wherein the sealing element is connected, by injection into a socket surrounding the circumference of the sealing element, tightly all the way around to this socket, and the socket is tightly connected over the entire circumference of the socket to the outer part, the socket, on one end face of the socket and/or the circumferential surface of the socket being welded to the outer part, the bottom of the cup-shaped out part being formed with a bowl-shaped indentation, which indentation surrounds the penetration opening, and the cross section of the indentation fits the cross section of the socket; and the socket is formed, on the end toward the container, with a flange which is welded to the outer part, and wherein on the periphery of the bowl-shaped indentation, the outer part is formed with a collar surrounding the indentation and protruding from the inner bottom face, which collar is welded to the flange that is integrally formed onto the socket.