Patent ID: 7172681

Claim:
A process for producing a rubber-based composite material, comprising the steps of: forming, by reactive sputtering, a metallic compound adhesion film on a substrate consisting of a plastic to be mated with a rubber for constituting said composite material, and laminating a rubber composition on said adhesion film, and vulcanizing said rubber composition, wherein said reactive sputtering is carried out to form said adhesion film by using a first target and a second target, composed of different metallic components and provided in a chamber, while moving said substrate from the first target side toward the second target side in sputtering atmospheres formed by supplying a reactive gas comprising at least one element selected from the group consisting of oxygen, nitrogen, and carbon into said chamber and applying electric power simultaneously to said first and second targets, and wherein at least one target selected from the first target and the second target comprises zinc, silicon, cobalt, copper, silver, tantalum, or tungsten, or an alloy of these elements, and a composition of the adhesion film on the substrate side differs from a composition of the adhesion film on the rubber side.