Process for bonding rubber to polyester shaped structures

Claim 1

THE PROCESS FOR BONDING RUBBER TO A SHAPED STRUCTURE COMPOSED OF A LINEAR CONDENSATION POLYESTER WHICH COMPRISES (1) COATING THE STRUCTURE WITH AN AQUEOUS MEDIUM CONTAINING FROM ABOUT 10% TO 40% BY WEIGHT OF DISPERSED SOLIDS OF: (A) A WATER-INSOLUBLE POLYEPOXIDE PREFERABLY HAVING ON THE AVERAGE AT LEAST 2 EPOXY GROUPS IN EACH MOLECULE, A MELTING POINT ABOVE ABOUT 90*C., AN AVERAGE MOLECULAR WEIGHT ABOVE ABOUT 800 AND AN EPOXIDE EQUIVALENT ABOVE ABOUT 200; (B) AN AROMATIC URETHANE HAVING THE FORMULA AR(NHCOX)N WHEREIN AR IS AN ORGANIC RESIDUE CONTAINING AT LEAST ONE AROMATIC NUCLEUS, X IS A RADICAL SELECTED FROM THE CLASS CONSISTING OF ARYLOXY, ARYLTHIO, IMINOXY, AND LACTAM-N-YL, AND N IS A WHOLE NUMBER OF AT LEAST 2, THE WEIGHT RATIO OF (A)/(B) BEING WITH THE RANGE FROM ABOUT 0.1 TO ABOUT 10; (C) A RESORCINOL-FORMALDEHYDE RESIN IN WHICH THE MOL RATIO OF RESORCINOL TO FORMALDEHYDE IS BETWEEN ABOUT 1.1 AND 8; AND (D) A SYNTHETIC VINYLPYRIDINE COPOLYMER LATEX, THE WEIGHT RATIO OF (D)/(C) BEING WITHIN THE RANGE FROM 1 TO 6, AND THE SUM OF (C) PLUS (D) CONSTITUTING FROM ABOUT 50% TO ABOUT 90% BY WEIGHT OF THE TOTAL SOLIDS DISPERSED IN THE AQUEOUS MEDIUM; (2) HEATING THE COATED STRUCTURE AT A TEMPERATURE ABOVE 135*C. AND BELOW THE MELTING POINT OF THE POLYESTER STRUCTURE TO DRY AND AT LEAST PARTIALLY CURE THE COATING, AND (3) APPLYING AND CURING A LAYER OF RUBBER ON THE COATED STRUCTURE.