Melt polymerization polycarbonate quenching
AssigneeSabic Global Technologies B.V.
InventorIgnacio Vic Fernandez
Life of this patent
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Abstract
In an embodiment, a melt polymerization process comprises melt polymerizing reactants in at least two polymerization units, in the presence of a catalyst composition to form polymerized polycarbonate; adding a quencher composition comprising one or both of a liquid quencher composition and a solid quencher composition; mixing the quencher composition with the polymerized polycarbonate for a period of time of greater than or equal to 5 seconds prior to the addition to the polymerized polycarbonate of any additives having a reactive OH group or reactive ester group; directing the polymerized polycarbonate to an extruder; and directing an additive to the extruder.
Claims17
A melt polymerization process comprising:
- melt polymerizing reactants in at least two polymerization units, in the presence of a catalyst composition to form polymerized polycarbonate, wherein the catalyst composition comprises a catalyst comprising a source of one or both of alkali and alkaline earth metal ions;
- adding a liquid quencher composition by a method comprising
- combining a liquid carrier and a quencher in a quencher vessel to form the liquid quencher composition and adding the liquid quencher composition to the polymerized polycarbonate at a pressure of greater than or equal to 2 bars;
- wherein the liquid carrier is free of water and phenol;
- mixing the quencher composition with the polymerized polycarbonate for a period of time of greater than or equal to 5 seconds prior to the addition to the polymerized polycarbonate of any additives having a reactive OH group or reactive ester group;
- filtering the polymerized polycarbonate;
- directing the polymerized polycarbonate to an extruder;
- directing an anthraquinone colorant, a phenolic antioxidant, a UV absorber, a release agent, a flame retardant, or a combination comprising one or more of the foregoing to the extruder;
- and
- adding an anti-drip agent.
Dependencies are inferred from the claim text.