Patent ID: 6657036
Filing Date: 2003-12-02
Classification: C08G

Abstract:
A process for preparing polycondensation resins in a reactor comprising polycondensation reacting polycondensation reactable materials comprising low molecular mass compounds in the presence of at least one heterogeneous catalyst, wherein small molecules are eliminated, wherein the at least one heterogeneous catalyst comprises an ion exchange resin, and at least one of:i. the exchange resin is doped with compounds from main groups 1 and 7 of the Periodic Table, and ii. the heterogeneous catalyst comprising the ion exchange resin further comprises from greater than 0% up to 50% by weight of at least one of copper, silver, tin, zinc, manganese, rhenium, iron, ruthenium, osmium, cobalt, rhodium, iridium, nickel, palladium, platinum, and vanadium.