Patent ID: 7754326

Claim:
A cushion body, consisting of: a cushion; and a release film layer provided on and adhered to a surface of the cushion; wherein the cushion comprises a silicon rubber, and the release film comprises: a fluororesin substrate coated with a layer consisting of oxides of metals comprising SiO x and an oxide of tin; the metal oxide layer comprising SiO x and an oxide of tin is in contact with the cushion surface, and no adhesive is present between the cushion material and the layer comprising SiO x and an oxide of tin, the surface of the cushion provided with the release film layer is a surface to contact a coverlay film used for bonding a printed board in a hot press, x is a value from 1 to 2, the layer comprising SiO x and oxide of Sn is obtained by a sputtering method, and a Si content is from 3.3 to 30 at % based on total elements contained in the layer comprising SiO x and oxide of tin.