Process for manufacturing polycarbonate from dianhydrohexitol Dialkylcarbonate
US9040654B2 · kind B2 · utility
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20Claims
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Key dates
| Filing date | Apr 5, 2012 |
| Grant date | May 26, 2015 |
| Priority date | — |
| Expiry date | Apr 5, 2032 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G64/305
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for manufacturing a polycarbonate, having a glass transition temperature greater than or equal to 50° C., includes: a step (1) of introducing into a reactor a monomer of formula (I) and R1 and R2 being identical or different alkyl groups; a step (2) of introducing into the reactor at least one cyclic diol or a mixture of diols (B) including at least 20 mol % of cyclic diols; a subsequent step (3) of polycondensation via transesterification of the mixture of monomers including the monomers (A) and (B); a step (4) of recovering the polycarbonate formed during step (3).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.