| abstract |
(57) [Summary] [Structure] The polyol is 3,9-disubstituted-1,5,7, 11-Tetraoxaspiro [5.5] undeca-2,8 Polymers obtained by condensation with divinyl orthocarbonates containing dienes. Including the case where the beneficial agent containing a hydroxyl group is all or a part of the polyol. [Effect] The polymer is useful for producing a biodegradable polymer for sustained release of a beneficial substance. |