Patent ID: 7863404
Filing Date: 2011-01-04
Classification: C08G

Abstract:
1. A method of producing an isosorbide-containing polycarbonate comprising the steps of: (i) providing a first monomer component comprising isosorbide, (ii) performing a monomer component conditioning step selected from the group consisting of: (a) testing the first monomer component for the presence of sorbitol, and if sorbitol is present, treating the first monomer component to reduce the level of sorbitol to an amount less than 0.10 mole % in the first monomer component, and (b) treating the first monomer component to reduce the level of sorbitol to an amount less than 0.10 mole % in the first monomer component, (iii) forming a reaction mixture by adding a diaryl carbonate and a catalyst to the first monomer component, and (iv) allowing the reaction mixture to react under polymerization conditions to build molecular weight, thereby producing an isosorbide-containing polycarbonate.