Tire cure bladders containing polytetrafluoroethylene powder and

Details Tire cure bladders containing polytetrafluoroethylene powder and Tire cure bladders containing polytetrafluoroethylene powder and

1996-01-16

1998-03-17

Vargot, Mathieu D.

Static molds

Having inflatable element

156401, 264315, 264326, 425 39, 425 52, B29C 3500, C08F21008

Patent

active

057283117

ABSTRACT:
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.

REFERENCES:
patent: 3002938 (1961-10-01), Gagne
patent: 3223676 (1965-12-01), Rucker
patent: 3600309 (1971-08-01), Loser et al.
patent: 3853809 (1974-12-01), Martin et al.
patent: 3932088 (1976-01-01), Harada et al.
patent: 3940455 (1976-02-01), Kaufman
patent: 3967968 (1976-07-01), Stone et al.
patent: 4215178 (1980-07-01), Martin, Jr.
patent: 4310427 (1982-01-01), Wun
patent: 4333977 (1982-06-01), Abrahams et al.
patent: 4407988 (1983-10-01), Abrahams et al.
patent: 4863650 (1989-09-01), Kohler et al.
patent: 5063268 (1991-11-01), Young
patent: 5162409 (1992-11-01), Mroczkowski
patent: 5238991 (1993-08-01), Magnus et al.
patent: 5538218 (1996-07-01), Patitsas et al.
"Standard Test methods for Vulcanized Rubber and Thermoplastic Rubbers and Thermoplastic Elastomers-Tension.sup.1 ", published by ASTM; Philadelphia, PA, Nov. 15, 1992 ASTM D412-92.
Chapter 10 of Rubber Technology 2nd Ed., Edited by Maurice Morton, published by Robert E. Krieger Publishing Co.: Malabar, Florida, Jan. 1, 1973, pp. 249-273.
Trade Literature from Exxon Chemical Company: Houston, Texas, apparently published Oct. 1, 1993, consisting of 68 printed pages including general fliers, specification sheets, and tire curing bladder recipes all related to Exxpro.TM. products.

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