| 摘要 |
PROBLEM TO BE SOLVED: To obtain a composition with excellent resistance to carbon dioxide by adding graphite or mica to an organic hydroperoxide-curable fluororubber. SOLUTION: There is provided a composition comprising 100 pts.wt. of an organic hydroperoxide-curable fluororubber, 1-10 pts.wt. of an organic peroxide such as benzoyl peroxide or the like, 0.1-20 pts.wt. of a polyfunctional compound such as tri(meth)allyl cyanurate or the like, 5-40 pts.wt. of graphite or mica having an average particle size of 100μm or less, not more than 50 pts.wt. of a reinforcing agent such as carbon black or the like, not more than 30 pts.wt. of an acid acceptor such as zinc oxide or the like, and further a filler, a plasticizer, a processing aid, a pigment or the like. The peroxide-curable fluororubber is obtained by polymerizing a fluorine-containing olefin such as tetrafluoroethylene or the like in the presence of a compound containing iodine and bromine such as 1-bromo-2-iodoperfluoroethane or the like thereby incorporating 0.01-5 wt.% of iodine and/or bromine into the fluoroolefin copolymer.
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