Isocyantate-free Method for Preparing Poly(carbonate-urethane) or Poly(ester-urethane)

摘要

Poly(carbonate-urethane) or poly(ester-urethane) may be characterised in that of carbonate soft segments have molecular weights Mn ranging between 10,000 and 250,000 g/mol. The segments' length may be monitored by the ring-opening polymerisation condition. The process of preparing the poly(carbonate-urethane) or poly(ester-urethane) may include immortal ring-opening polymerisation of a cyclic carbonate or of a cyclic ester or diester monomers in the presence of a first catalyst system and diols or polyols. The process may include chemical modification of the hydroxyl chain-end groups into carboxylic groups in the presence of a second catalyst system. The process may include a coupling reaction with at least 2 equivalents of a second cyclic carbonate, enabling coupling with the carboxylic moiety in the presence of a third catalyst system. The process may include polyaddition of a diamine or a of amine via ring-opening of the second cyclic carbonate, and obtention of poly(carbonate-urethane) or poly(ester-urethane).

主权项

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, bearing or not functional groups, in the presence of a first catalyst system and in the presence of one or more dials 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)