Patent ID: 7666977
Filing Date: 2010-02-23
Classification: C08G

Abstract:
1. A process to prepare a poly(carbonate-co-urea) copolymer in as little as one single polymerization reaction comprising reacting in the melt: (a) a dihydroxy reaction component comprising a dihydroxy compound, (b) a diaryl carbonate reaction component comprising a diaryl carbonate, (c) a urea reaction component comprising a monomeric urea compound in the presence of (d) a transesterification catalyst during at least part of the reaction and removing a phenolic byproduct to produce a poly(carbonate-co-urea) copolymer comprising both carbonate —(O(C═O)O)— and urea —(N(C═O)N)— linkages, wherein the urea and dihydroxy compounds are reacted in a molar ratio: (total moles of urea compound)/((total moles of urea compound)+(total moles of dihydroxy compound)) of less than or equal to 0.5.