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US Patent 6846444 Self-releasing curing bladders

Patent 6846444 was granted and assigned to The Goodyear Tire & Rubber Company on January, 2005 by the United States Patent and Trademark Office.

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Patent abstract

The invention relates to expandable butyl rubber bladders for use in curing presses for hydrocarbon rubbers such as pneumatic tires. The bladders are a crosslinked butyl rubber composition comprising isobutylene repeat units and the bladder composition contains ultra high molecular weight polyethylene, alone or in combination with graphite and/or fluorinated ethylene polymers, dispersed within the bladder composition. The bladder composition may also contain castor oil, corn oil and/or soya-bean oil. The invention also relates to a method of curing tires by utilizing such butyl rubber bladder.

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