| 摘要 |
The invention relates to block copolymers of general formula (I) -[-O-CO-O-A-O-CO-O-B-]a-(I) where a is an integer between 2 and 300 inclusive; A and B, which may be the same or different, are blocks which can be obtained by reaction between a bis(chloroformate) of oligomeric poly(caprolactone) and a polyester residue of formula (II) HO-[-R1-CO-O]x-[-R2-CO-O-]y-H (II) where R1 and R2, which may be the same or different, are each an aliphatic hydrocarbon residue with a linear or branched chain having from 1 to 4 carbon atoms; x and y are integers from 1 to 50, in any possible ratio from 0 to 1; the groups -R1-COO- and -R2-COO- being randomly distributed in the polyester residue. |
