Abstract: A method of bonding a polyamide plastics material to a rubber composition comprises heating the polyamide plastics material to soften at least its surface, contacting the softened surface with a rubber composition and allowing the polyamide plastics material to cool in contact with the rubber composition. The plastic-rubber composite produced by this method may be used in applications in which hitherto rubber-metal composites have been used, of which the following is a specification.

Abstract: A method of producing a molded plastic-rubber composite comprising injection or transfer molding a substantially linear crystalline low pressure solution olefin polymer so that it is brought, in a molten state, into contact with a prevulcanized rubber component containing up to 70 per cent by volume of a rubbery olefin polymer.The plastic-rubber composite produced by this method may be used in applications in which hitherto rubber-metal composites have been used, for example valve diaphragms, tire valve bodies, shock absorbers, engine mountings, vibration dampers, compression springs, torsion bushes, flexible drive couplings etc., of which the following is a specification.

Abstract: A method of producing a moulded plastic-rubber composite comprising injection or transfer moulding a thermoplastic high pressure polymerized ethylene polymer so that it is brought, in a molten state, into contact with a prevulcanized rubber component containing up to 55 per cent by volume of a rubbery olefin polymer.The plastic-rubber composite produced by this method may be used in applications in which hitherto rubber-metal composites have been used, for example valve diaphragms, tire valve bodies, shock absorbers, engine mountings, vibration dampers, compression springs, torsion bushes, flexible drive couplings etc., of which the following is a specification.

Abstract: A composite structure comprises an unsaturated hydrocarbon rubber, polychloroprene or a chloroprene/hydrocarbon copolymer bonded without an adhesive layer to a polymer being a reaction product of at least one aliphatic dihydric alcohol and at least one aromatic compound having two acidic groups attached to the aromatic nucleus, or to an elastoplastic linear block copolymer having at least one block of this reaction product.A method of making this structure comprises treating the rubber surface to be bonded with concentrated nitric acid, hypochlorous acid or a hypochlorous acid generator, melting at least the surface of the polymer to be bonded, and solidifying the polymer in contact with the rubber.The invention provides a polyester/rubber structure conveniently without an adhesive interlayer and the structure is useful in applications requiring properties of polyesters and rubbers, for example belting, hose and tires.