Patent ID: 8871895
Filing Date: 2014-10-28
Classification: C08G

Abstract:
1. A process for manufacturing a polycarbonate, characterized in that it comprises: a step (1) of introducing, into a reactor, a composition (A) comprising at least one dianhydrohexitol carbonate bearing two alkyl carbonate functions, said composition (A) comprising, relative to the sum of (A1) plus (A2): from 0 to 99.9% by weight and preferentially from 70% to 99.9% by weight of monomers (A1) of formula: and from 0.1% to 100% by weight and preferentially from 0.1% to 30% by weight of monomers (A2) of formula: and R1, R2, R3 and R4 being identical or different alkyl groups; a step (2) of introducing a diol or a mixture of diols (B); a subsequent step (3) of polycondensation by transesterification of the monomer mixture comprising (A2), (B) and optionally (A1); a step (4) of recovering the polycarbonate formed in step (3).