Method of bonding synthetic high polymers to polyurethane elastomers

Claim 1

THE PROCESS OF BONDING A FABRIC OF A LONG CHAIN POLYAMIDE HAVING A HIGH MELTING POINT TO A FLEXIBLE ELASTOMERIC REACTION PRODUCT, FREE OF ALIPHATIC CHEMICAL UNSATURATION, OF ABOUT 1 MOLE OF A GENERALLY LINEAR LONG CHAIN POLYHYDROXYL-CONTAINING POLYMER SELECTED FROM THE GROUP CONSISTING OF POLYESTERS AND POLYETHERS, AND ABOUT 1 MOLE OF AN ORGANIC DIISOCYANATE, COMPRISING THE STEPS OF FORMING A COATING ON THE FABRIC COMPOSED ESSENTIALLY OF AN INFUSIBLE INSOLUBLE RESIN BY APPLYING TO THE FABRIC AN AQUEOUS SOLUTION CONSISTING ESSENTIALLY OF DIHYDROXY PHENOL AND SUFFICIENT FORMALDEHYDE TO FORM AN INSOLUBLE RESIN TOGETHER WITH A RESIN-FORMING CATALYST AND HEATING THE FABRIC SUFFICIENTLY TO CONVERT AT LEAST A PORTION OF THE PHENOL AND FORMALDEHYDE TO FORM AN INSOLUBLE RESIN, CLEANING THE ELASTOMER WITH AN ORGANIC SOLVENT TO PROVIDE A CLEAN SURFACE FOR BONDING, CALENDERING THE FABRIC TO THE ELASTOMER, AND THEREAFTER SUBJECTING THE FABRIC AND ELASTOMER TO A CURING TEMPERATURE, SAID ELASTOMER REACTION PRODUCT BEING FREE OF OLEFINIC UNSATURATION.