Abstract: Disclosed are expandable bladders for use in curing presses for rubber compositions such as pneumatic tires. The bladders are a crosslinked elastomer comprising an isobutylene rubbery polymer. The bladder composition includes corn oil which improves the release characteristics of the cured bladder from a tire innerliner cured in contact with said bladder. The improved release characteristics have been observed to allow rubber compositions such as tires to be molded with fewer defects caused during release of the bladder from the tires or caused by abraded or deformed bladders. The use of corn oil also has been observed to increase the useful life time of the bladder allowing more tires to be cured without changing bladders. A preferred isobutylene rubbery polymer is a brominated copolymer of isobutylene and p-methylstyrene. The bladder compositions have also been observed to have an enhanced flexibility due to the corn oil.

Abstract: Expandable bladders for use in curing presses for hydrocarbon rubbers such as pneumatic tires are a crosslink elastomer comprising isobutylene repeat units and include graphite. A preferred isobutylene elastomer is a brominated copolymer of isobutylene and p-methylstyrene. The bladders have enhanced lubricity, low adhesion to tire innerliners, and lower hot tension set. The above enhancements allow hydrocarbon rubbers such as tires to be molded with fewer defects caused by abraded or deformed bladders. They also enhance the useful life of the bladder reducing the cost of tire curing.

Abstract: A rubber laminate comprising a rubber substrate having coated thereon a blend of a water dispersible insoluble polyurethane and a water soluble polyvinyl alcohol. The combination of water soluble and water insoluble polymers upon drying result in a film that is humidity resistant, and has good abrasion resistance but can be removed by high-pressure washing or scrubbing.

Abstract: A composition comprised of polyvinylalcohol coating and at least one water insoluble particulate organic or inorganic material having a plate-like structure. Preferred particulate materials are flake mica and flake glass. In addition, there is provided a coated rubber tire having at least one of its surfaces coated with such composition.

Abstract: A composition comprised of polyvinyl alcohol coating and at least one water insoluble particulate organic or inorganic material having a plate like structure for use on at least one side of a rubber tire. Preferred particulate materials are flake mica and flake glass.

Abstract: A lubricant composed of a siloxane, a fatty acid lubricant, mica and at least one selected thickener and use thereof for curing tires.

Abstract: A lubricant composition comprised of (A) fatty acid, (B) polytetrafluoroethylene fluorocarbon resin powder (C) pyrogenic amorphous silica powder and (D) carrier. The lubricant is prescribed for use with a pneumatic tire and wheel assembly containing a run-flat device. The lubricant is contemplated as a component in such an assembly.

Abstract: A pneumatic rubber tire having a polyurethane inlay laminate on at least one of its sidewalls. Said polyurethane inlay is applied as a hot melt of a polymer blend comprised of a thermoplastic polyurethane and an uncured halobutyl rubber.