Self-releasing curing bladders

Details Self-releasing curing bladders Self-releasing curing bladders

2005-01-25

2005-01-25

Mackey, James P. (Department: 1722)

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

C425S043000, C425S052000

Reexamination Certificate

active

06846444

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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