Patent ID: 9080016
Filing Date: 2015-07-14
Classification: C08G

Abstract:
1. A process for preparing poly(carbonate-urethane) or poly(ester-urethane) that comprises the steps of: a) immortal ring-opening polymerisation of a first 5-, 6-, or 7-membered cyclic carbonate or of a cyclic ester or diester monomers, bearing or not bearing functional groups, in the presence of a first catalyst system and in the presence of one or more diols or polyols acting both as co-initiators and chain transfer agents; b) chemical modification of the hydroxyl chain-end groups into carboxylic groups in the presence of a second catalyst system; c) coupling reaction with at least 2 equivalents of a second 5-, 6-, or 7-membered cyclic carbonates, bearing at least one functional group enabling coupling with the carboxylic moiety, in the presence of a third catalyst system; d) polyaddition of a diamine or a polyamine via ring-opening of the second terminal 5-, 6-, or 7-membered cyclic carbonate of step c); e) obtention of poly(carbonate-urethane) or poly(ester-urethane).