| abstract |
An optically active oligomer obtained by polycondensation of an (R)-3-hydroxyalkanoic acid alkyl ester and a diol, a diamine and/or an amino alcohol may be copolymerized with monomer selected from diisocyanic acid esters, dicarboxylic acid derivatives, and dichlorosilanes to give an optically active polymer. The functional thermoplastic polymers so produced (polyesters, polyetherpolyesters, polyester-polyurethanes and polyester-polyether-polyurethanes) are biodegradable and hydrolyzable, and lend themselves to industrial production. |