TH40859A3 - Highly pure polycarbonate And processes for the production of these substances - Google Patents

Abstract

DC60 (09/09/42) A described process for the production of polycarbonate with an exogenous index of less than 2.5 .10 to a power of 4 μs / g or an alkali salt less than 50. ppb by the process Junction to the phase, where the solution containing Polycarbonate was washed with water-containing rinsing liquid, rinsed liquid was separated. And the volatile solvent, which characterizes the mixtures of organic polycarbonate solutions And the liquid that washes the part The rest After the washed liquid was separated, it was heated until a clear solution was obtained and filtered to separate the solids, a process described for the production of polycarbonate with an exogenous index of less than 2.5 .10 4 μm. .2 / g or less than 50 ppb alkali salt by the process Junction to the phase, where the solution containing Polycarbonate was washed with water-containing rinsing liquid, rinsed liquid was separated. And the volatile solvent, which characterizes the mixtures of organic polycarbonate solutions And the liquid that washes the part The rest After the washed liquid is separated, it is heated until the clear solution is obtained and filtered to separate the solids.

Claims (2)

1. Process for the production. Polycarbonate By the process at the intersection of the phases, in which a solution containing polycarbonate Was rinsed with water-based rinsing liquid, the washed liquid was separated and evaporated solvent, characteristic in place Mixture of poly solution Organic carbonates And washing liquid The remainder is acquired After the washed liquid is separated, it is heated until the clear solution is obtained and filtered to separate the solids. 2. Processes for Purification Tagged solution: