Tire curing bladder with improved release from the tire...

Details Tire curing bladder with improved release from the tire... Tire curing bladder with improved release from the tire...

C - Chemistry, Metallurgy

08

L

C08L 23/22 (2006.01) B29C 33/50 (2006.01) B29C 33/60 (2006.01) B29C 33/62 (2006.01) B29C 43/10 (2006.01) B29D 30/06 (2006.01) C08K 3/04 (2006.01)

Patent

CA 2135032

Disclosed are expandable bladders for use in curing presses for hydrocarbon rubbers such as pneumatic tires. The bladders are a crosslink elastomer comprising isobutylene repeat units and the bladder composition includes 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.

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