1,4-Butanediol, polymer with 1,3-diisocyanatomethylbenzene and α-hydro-ω-hydroxypoly( oxy-1,4-butanediyl)

1,4-Butanediol, polymer with 1,3-diisocyanatomethylbenzene and .alpha.-hydro-.omega.-hydroxypoly(oxy-1,4-butanediyl) Poly tetramethylene ether glycol polymer with 1,4 butanediol and 1,3-diisocyanatemethylbenzene