Patent ID: 7521521
Filing Date: 2009-04-21
Classification: C08G,C08L,C09D

Abstract:
1. A process for preparing a high-functionality highly or hyper-branched polycarbonate having a degree of branching of from 10 to 99.9%, comprising at least the following steps: a) preparation of one or more condensation products (K) by reaction of at least one organic carbonate (A) of the formula RO[(CO)O] b) intermolecular reaction of the condensation products (K) to form a high-functionality highly or hyper-branched polycarbonate, the alcohols (B) being trifunctional or higher polyfunctional polyetherols based on alcohols with a functionality of three or more and on ethylene oxide, propylene oxide or butylene oxide or mixtures thereof, and the proportion of OH groups to phosgenes or carbonates in the reaction mixture being selected such that the condensation products (K) comprise on average one carbonate group and more than one OH group or one OH group and more than one carbonate group and the reaction being carried out in the presence of at least one suitable catalyst.