COMPOSITION FOR FLUORINE-CONTAINING RUBBER-BASED SEAL MATERIAL AND FLUORINE-CONTAINING RUBBER-BASED SEAL MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide a composition for fluorine-containing rubber-based seal material which is excellent in heat resistance, cold resistance, fuel oil resistance and low fuel permeability and a fluorine-containing rubber-based seal material.;SOLUTION: A composition for fluorine-containing rubber-based seal materials contains a copolymer which has a fluorine content of 64-69 wt.% and cross-linked parts originated from a bromine-containing compound and/or an iodine-containing compound and is capable of cross-linking with a peroxide, and the composition of component units of the copolymer consists of (a) VDF, (b) TFE, (c) FMVE, (d) FMMVE and (e) a brominated and/or an iodinated unsaturated fluorohydrocarbon component units in a content of 0.01-3 mol to 100 mol of the total of contents of (a) to (d). The composition for fluorine-containing rubber-based seal materials contains a fluorine-containing rubber polymer having a blend ratio A of the components (a) to (d) of the copolymer, defined as A=[(c)+(d)]/[(a)+(b)+(c)+(d)], of 10-20% and a ratio B, defined as B=(d)/[(c)+(d)], of 20-30%.;COPYRIGHT: (C)2015,JPO&INPIT