Patent ID: 6395862
Filing Date: 2002-05-28
Classification: C08G

Abstract:
A method for preparing polycarbonates, which comprises the step of contacting a diaryloxy compound with a dihydric phenol compound in the presence of a compound of Formula (I)Ax+y[(Triazinyl-Pyridyl)Byâˆ’x],â€ƒâ€ƒ(I) wherein A is an alkali metal selected from the group consisting of lithium, sodium, potassium, and cesium; B is a charge balancing sulfonate, carboxylate, or phosphonate group; x is an integer of from 1 to 4; y is an integer of from 1 to 4; and optionally in the presence of a co-catalyst selected from tetraalkyl ammonium and tetraalkyl phosphonium salts; under polycarbonate melt polymerization conditions.