The invention provides an aliphatic polymer having a ketone group and
ether bonding in its main chain, characterized by comprising structural
units represented by the Formula (1) and by the Formula (2). ##STR00001##
In the Formulae (1) and (2), Ra and Rb each independently represents a
substituted or unsubstituted divalent aliphatic hydrocarbon group. Rc
represents a substituted or unsubstituted divalent aliphatic hydrocarbon
group having ether bonding in a terminal thereof, or a single bond. N1
represents an integer of 1 or more. N2 represents an integer of 0 or
more. And, n1+n2 is in a range of 2 to 1000. The polymer preferably
contains ether bonds and ketone groups in a ratio of 0.01 to 100. The
polymer can be substantially comprised of a structural unit represented
by the Formula (1) as a repeating unit. A resin composition containing as
a component structural units represented by the Formula (1) is also
provided. The resin composition may further comprise an electrically
conductive powder.