Process for manufacturing polycarbonate from derivatives of dianhydrohexitols bearing two alkyl carbonate functions

摘要

A process for manufacturing polycarbonate includes:—a step (1) of introducing into a reactor a particular composition (A) of at least one dianhydrohexitol carbonate bearing two alkyl carbonate functions; a step (2) of introducing a diol or a mixture of diols (B); a subsequent step (3) of polycondensation by transesterification of the mixture of monomers including (A) and (B); a step (4) of recovering the polycarbonate formed during step (3).

主权项

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).