Treatment for improving adhesion of fibrous material to rubber

Claim 1

IN THE PROCESS OF PREPARAING A RUBBER ARTICLE REINFORCED WITH A STRUCTURE COMPOSED OF SYNTHETIC FIBROUS MATERIAL, SELECTED FROM THE GROUP CONSISTING OF POLYESTER, NYLON AND VISCOSE RAYON YARN, WHICH INCLUDES FORMING A BONDING COAT ON THE STRUCTURE BY TREATMENT WITH AN EPOXY COMPOUND TOGETHER WITH A CURING AGENT FOR THE EPOXY COMPOUND, TREATMENT WITH A LATEX OF SYNTHETIC ELASTOMER AND DRYING THE COATING, FORMING AN ASSEMBLE OF THE COATED STRUCTURE WITH RUBBER AND THEN VULCANIZING HE ASSEMBLY; THE IMPROVEMENT OF APPLYING TO THE SYNTHETIC FIBROUS MATERIAL A FIRST LAYER CONTAINING A LOW MOLECULAR WEIGHT EPOXY COMPOUND FREE FROM CURING AGENT, APPLYING THEREOVER A DISTINCT SECOND LAYER COMPRISING A CURING AGENT FOR THE EPOXY COMPOUND AND A LATEX OF SYNTHETIC ELASTOMER COMPOSITION CONTAINING AT LEAST 25% OF COPOLYMERS OF BUTADIENE AND A VINYLPYRIDINE, HEATING THE COATED STRUCTURE AT A TEMPERATURE OF 300* TO 500* F. FOR A TIME SUFFICIENT TO CAUSE A CURING REACTION BETWEEN THE EPOXY COMPOUND AND THE CURING AGENT AT THE INTERFACE BETWEEN THE FIRST AND SECOND LAYERS, BRINGING HE COATED STRUCTURE INTO CONTACT WITH A VULCANIZABLE ELASTOMER COMPOSITION, AND THEREAFTER CURING THE ASSEMBLY WITH HEAT AND PRESSURE.