Patent ID: 8372941
Filing Date: 2013-02-12
Classification: C08G,C08K,C08L

Abstract:
1. A process comprising sequentially: (a) subjecting a first mixture to a first temperature, wherein the first mixture comprises (i) an aromatic polyether made by a halide displacement polymerization process and selected from the group polyetherimides, polyethersulfones, polyetherketones, polyetheretherketones, and combinations thereof, (ii) a guanidinium catalyst, (iii) an alkali metal halide, (iv) an acid component selected from the group consisting of acids, acid salts, and combinations thereof, and (v) an organic solvent; (b) subjecting the first mixture to a second temperature for a time sufficient to promote adsorption of the guanidinium catalyst with the alkali metal halide, thereby forming an adsorbed component comprising the guanidinium catalyst and alkali metal halide; (c) using a liquid-solid separation technique to remove the adsorbed component from the first mixture at a third temperature to form a second mixture; wherein less than 0.005 weight percent (50 ppm) of water is present during the process, based on the total weight of the first mixture wherein the first temperature is higher than the second temperature and the second temperature is 23° to 150° C.