Process for producing fiber-rubber composite

A process for producing a polyester fiber-rubber composite comprising

• contacting a polyester fiber composed mainly of polyethylene terephthalate with (1) an adhesive composition (AR) consisting mainly of a latex (A) of a vinylpyridine-conjugated diene type copolymer containing a vinylpyridine unit in an amount of 25-60% by weight and a conjugated diene unit in an amount of 40-75% by weight and a resorcinol-formaldehyde resin and
• then contacting the fiber with (2) an adhesive composition (BR) consisting mainly of a latex (B) of a nitrile group-containing highly saturated copolymer rubber having an iodine value of 120 or less obtained by emulsion polymerization or by emulsion polymerization followed by hydrogenation in the emulsion state and a resorcinol-formaldehyde resin,
• contacting the thus treated fiber with a nitrile group-containing highly saturated copolymer rubber having an iodine value of 20 or less, and
• embedding the treated polyester fiber in the nitrile group-containing highly saturated copolymer rubber and
• bonding said polyester fiber and said copolymer rubber by vulcanizing the copolymer rubber with a peroxide vulcanizing system.