| abstract |
The present invention provides multiblock hydrophilicity-hydrophobicity tapered amphiphilic segment polyurethanes represented by the following general formula (A): <IMAGE> (A) wherein (S) is (a) a polyalkylene oxide segment represented by the following general formula (I): -R1-O-R1-O)l(I) (b) an aliphatic polyester segment which is the reaction product of a dibasic acid and a dihydric alcohol represented by the following general formula (II): <IMAGE> (II) or (c) a polyester segment which is the reaction product of a ring-cleaved polymer of a cyclic ester and a dihydric alcohol represented by the following general formula (III): <IMAGE> (III) |