LOWLY SWELLING RUBBER COMPOSITION AND MOLDED ARTICLE OBTAINED THEREFROM

摘要

The present invention provides the following low-swelling rubber composition and a molded article prepared therefrom: a low-swelling rubber composition comprising 100 parts by weight of a mixture (hereinafter referred to as "composition (A)") and 0.1 to 15 parts by weight of a peroxide crosslinking agent admixed therewith, the composition (A) comprising 5 to 95 wt.% of a peroxide-crosslinkable fluororubber containing vinylidene fluoride copolymerized therein in a proportion of 45 to 88 mole % and having a number average molecular weight of 5,000 to 200,000, and 95 to 5 wt.% of an acrylic rubber containing (i) 0.1 to 1.5 wt. % of a polyfunctional monomer copolymerized therein and having a functional group rendering the acrylic rubber peroxide-cocrosslinkable with the fluororubber and a functional group effecting the copolymerization of the monomer with a (meth)acrylic ester, (ii) 20 wt.% or more of (meth) acrylic alkoxy-substituted alkyl ester copolymerized therein and/or (iii) 4 wt.% or more of acrylonitrile copolymerized therein.