Abstract: A heat stable bond between uncured urethane formulations and a rubber or synthetic rubber substrate is obtained by a method comprising coating the rubber surface with first a polyamine solution, then a peroxide solution and then a polyisocyanate-terminated monomer or prepolymer before applying the uncured urethane. While previously used bonds employing cyanoacrylate ester adhesives lose bond strength at elevated temperatures, the bond achieved in the present invention is stable throughout the operating temperature of the urethane.
Abstract: A method wherein uncured urethane formulations are bonded to a cured rubber or synthetic rubber substrate in such a manner so as to provide greater bonding strength than has been achieved previously in urethane formulation bonding to rubber or synthetic rubber.
Abstract: A substantially conventional tubeless or tube-type tire casing is mounted on a wheel and contains a centrifugally distributed solid elastic fill material which is deflation proof. A heat curable elastomer is injected into the casing in liquid form, the casing is pneumatically pressurized to seat upon the wheel rims, and the assembly is rotated to centrifugally distribute and position the liquid elastomer until it has cured. Alternatively, a pressurizable tube of relatively small diameter extends about the wheel within the casing and between the beads and rims of the casing and wheel. The tube is belted to limit its radially outward expansion and is filled with air at a pressure sufficient to securely hold the casing beads on the wheel rims. The elastic fill material may have characteristics providing a ride equivalent to a relatively low air pressure and at the same time, the casing will be securely locked to the wheel by relatively high pressure in the belted tube.
Abstract: A flat free pneumatic tire comprising a casing and a void free elastomeric filling material, which filling material is a polyurethane of (a) prepolymer of organic polyisocyanate and defined polyether or defined polyester and (b) a defined polyether or defined polyester, in the absence of foam producing material in the reaction zone. The elastomeric filling material itself. A two container article (system) adapted for producing said void free filling material where one container has said prepolymer reactant and the other container has the polyether or polyester reactant, as required.