Patent ID: 7659359
Filing Date: 2010-02-09
Classification: C08G,C08J

Abstract:
1. A method of forming an isosorbide-containing polycarbonate composition, the method comprising the steps of: (I) combining a polycarbonate comprising repeat units derived from isosorbide with a polycarbonate-property-modifying additive to form a polycarbonate composition, (II) dissolving a sample from the polycarbonate composition in a non-aqueous solvent to form a polycarbonate composition solution, (III) determining the non-aqueous pH of the polycarbonate composition solution and determining the non-aqueous pH of the solvent, (IV) comparing the pH of the solvent with the pH of the polycarbonate composition solution, and if the pH of the polycarbonate composition solution is more than 0.8 below or more than 0.5 above the pH of the solvent then taking an action selected from the group consisting of: thereby forming an isosorbide-containing polycarbonate composition.