3-Hydroxy-2-(hydroxymethyl)-2-methylpropanoic acid polymer with 1,6- diisocyanatohexane, diphenyl carbonate, 1,6-hexanediol, 5-isocyanato-1- (isocyanatomethyl)-1,3,3-trimethylcyclohexane and methyloxirane polymer with oxirane monobutyl ether, block