Rubber composition for extrusion molding and for molding with mold and use thereof

   
   

This invention relates to a rubber composition for extrusion and molding comprising 100 weight parts of ethylene/.alpha.-olefin/non-conjugated polyene copolymer (A) composed of ethylene, .alpha.-olefin having carbon atoms of 3-20 and non-conjugated polyene, and at least 30-300 weight parts of carbon black (B), and 1.0.times.10.sup.-5 -5.0.times.10.sup.-3 mol of an alkoxysilane compound shown by the following formula (I): ##STR1## wherein, R is alkyl or alkoxy, R.sup.1 is alkyl or phenyl, n is 0, 1 or 2, R.sup.2 is a bivalent hydrocarbon, R.sup.3 is arylene group, m and p are 0 or 1 respectively, and m and p are not 0 at a same time, q is 1 or 2, and D is --SCN or --SH when q is 1, and --Sx-- when q is 2 (wherein x is an integer of 2-8).

 
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