
Novel polymers represented by the formula where A and B are each selected from the group consisting of a straight and branched alkylene, a straight and branched alkylene containing, as a part thereof, a double bond, a triple bond or a radical --(CH.sub.2 CH.sub.2 O).sub.y --CH.sub.2 --CH.sub.2 --wherein y is an integer of from 1 to 20, xylylene and cyclohexylene; R.sub.1, R.sub.2, R.sub.3 and R.sub.4 represent a lower alkyl group, or R.sub.1 and R.sub.2, and/or R.sub.3 and R.sub.4, when taken to...











