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US 6,555,646 B2Granted
Process for preparing polycarbonate
AssigneeGeneral Electric Company
InventorsAndre Volkers, Marcel Puyn, Ralph Stevens
Life of this patent
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Abstract
A process for quenching a catalyst used in the manufacture of polycarbonate by melt polycondensation of a dihydroxy compound and a diester. The process includes adding a quencher composition to an intermediate polycarbonate to deactivate residual catalyst. The quencher composition includes a compound having at least one sulfonic acid group and at least one amino group.
Claims14
A process for quenching an alkaline catalyst used in a melt polycondensation reaction for the production of polycarbonate, the process comprising:
- combining an intermediate polycarbonate composition with a quenching composition in a reactor, wherein the quenching composition comprises a difunctional compound having at least one acid or acid ester moiety and at least one amine moiety,
- heating the intermediate polycarbonate;
- and
- reducing the pressure in the reactor to produce a finished polycarbonate.
1 more element
Dependencies are inferred from the claim text.