Copolymers of e-caprolactone and cyclic esters of alpha-hydroxyacids and polyurethanes derivable from these polymers

摘要

Pourable polymers having desirable properties are obtained by co-polymerising (a) a lactone or corresponding aliphatic hydroxyacid (b) cyclic dimeric ester of an alpha -hydroxyacid or the corresponding alpha -hydroxyacid, in which the mole ratio of (a) to (b) is greater than 1.5 : 1 and their viscosity is less than 2000cps. The polymers can further be reacted with isocyanates to form polyurethanes having desirable properties.