Patent ID: 8158745
Filing Date: 2012-04-17
Classification: C08G

Abstract:
1. A polycarbonate with one or more structures of the general formulae (I) to (IV) wherein the phenyl rings independently of one another can be mono- or disubstituted by C wherein the amount of structural units (I) to (IV) in total is 50 to 900 ppm, based on the underlying polycarbonate, wherein the polycarbonate comprises linear and cyclic oligomers in an amount of from 0.1 to 2 wt. %, based on the total composition, wherein the linear oligomers are those of the formulae (V) to (IX) wherein the amount of structures (VIII) and (IX) is less than 0.001 wt. %, and the cyclic oligomers are those of the general formula (X) wherein n is an integer from 2 to 6 and Z represents a radical of the formula (1a) in which R X represents a single bond, to C