Patent ID: 8631933

Claim:
A bottle cap for containing a different material, comprising: an exterior material formed of a metal material; and a container formed of a synthetic resin, and coupled to an inner portion of the exterior material, wherein: the container comprises a sealing part coupled to a bottle neck of a bottle, and an operation part coupled to the exterior material; the exterior material is coupled perpendicularly to the bottle neck, together with the container; after the bottle cap is coupled to the bottle neck, a side portion of the exterior material is sealed by a series of mechanical devices to conform with a screw thread or screw groove of the bottle neck; the operation part is disposed on a lower portion of a top of the exterior material, and has a tubular shape with a storage space; the sealing part is coupled substantially to the tubular shape of the operation part to seal the storage space storing a material; and when the bottle cap is opened, the exterior material is moved upward along the bottle neck, and the material stored in the storage space is dropped into the bottle, and is mixed.