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).
