B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 35/02 (2006.01) B29C 33/50 (2006.01) B29C 33/60 (2006.01) B29C 33/62 (2006.01) C08L 23/22 (2006.01) C08L 23/28 (2006.01) B29C 35/04 (2006.01)
Patent
CA 2180797
Expandable bladders for use in curing presses for hydrocarbon rubbers, such as pneumatic tires, are a crosslinked elastomer composition comprising isobutylene repeat units and including a fluorinated ethylene polymer added in particulate form and thereafter dispersed throughout the bladder. These fluorinated ethylene polymer may or may not form fibers. The bladders may further comprise graphite. A preferred isobutylene elastomer is a brominated copolymer of from 80 to 99 weight percent isobutylene and from 1 to 20 weight percent paramethylstyrene. The bladders have enhanced lubricity, reduced adhesion to cured tire innerliners, better resistance to cracking during flexing, and have lower tension set than similar compositions without fluorinated ethylene polymers. 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.
Apticar Samson Samuel
Kansupada Bharat Kanchanlal
Patitsas George Philemon
Sandstrom Paul Harry
Smart & Biggar
The Goodyear Tire & Rubber Company
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