Patent ID: 8003030

Claim:
A process for producing gaskets comprising the steps of: forming a metal core material using a stainless steel plate; treating the resulting metal core material with an alkali treating solution; preparing an unvulcanized rubber molded product; mounting the metal core material treated in the treating step to the unvulcanized rubber molded product; and vulcanizing the rubber-molded product to thereby anchor the elastic material to the metal core material without using an adhesive; characterized in that the alkali treating solution used in the step of alkali treatment comprises: (A) an alkali metal hydroxide or an alkaline earth metal hydroxide; (B) an alkali metal silicate or an alkaline earth metal silicate; and (C) a carboxylate salt; the step of alkali treatment comprising the step of causing a plurality of OH groups to form single-bonds so as to cover an entire surface of the stainless steel plate to be treated, using the components (A) and (B) contained in the alkali treating solution; and the alkali treatment being performed for 10 to 30 minutes.