| 摘要 |
PROBLEM TO BE SOLVED: To provide a rubber or gel material having good resistance to dimethyl ether (DME) among a rubber or a gel material having a perfluoropolyether structure and excellent also in heat resistance and cold resistance. SOLUTION: The rubber or the gel material is a fluorine elastomer obtained by crosslinking a curable composition containing (A) a straight-chain polyfluoro-compound represented by formula (1) [wherein X and X' are each -CH<SB>2</SB>- or -Y-NR-CO- (wherein Y is -CH<SB>2</SB>- or phenylsilyl group; R is a methyl group or a phenyl group); p is independently 0 or 1; r is an integer of 2-6; m and n are each an integer of 0-200], having two alkenyl groups in one molecule and having a perfluoropolyether structure in the main chain, (B) a fluorine-containing organopolysiloxane having three or more hydrogen atoms directly bonded to a silicon atom in one molecule and (C) a hydrosilylation reaction catalyst, and has≤20% degree of swelling to dimethyl ether. COPYRIGHT: (C)2007,JPO&INPIT
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