Mixtures resulting from methods for purification of polyether polymers
View Patent ↗A method for the purification of aromatic polyether polymers prepared by a halide displacement polymerization process comprises adsorbing the catalyst with an alkali metal halide to form an adsorbent component and then removing the adsorbent component. Mixtures resulting from this method are also discussed.
1. A mixture consisting essentially of an aromatic polyetherimide made by a halide displacement polymerization process, (ii) a guanidinium catalyst, (iv) an acid component selected from the group consisting of acids, acid salts, and combinations thereof, and (v) an organic solvent,
wherein the mixture has less than 0.005 weight percent of water based on the total weight of the mixture and less than or equal to 150 parts by weight of the catalyst per million parts by weight of mixture.
2. The mixture of claim 1 , wherein the mixture is a solution and the aromatic polyether is present in an amount less than or equal to 50 weight percent, based on the total weight of the solution.
3. A product mixture made by 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 the product mixture;
wherein less than 0.005 weight percent (50 ppm) of water is present during the rocess, based on the total weight of the first mixture.
4. The product mixture of claim 3 , wherein the product mixture is a solution comprising the aromatic polyether in an amount less than or equal to 50 weight percent, based on the total weight of the solution.
5. The product mixture of claim 4 , wherein the aromatic polyether is a polyetherimide and the product mixture comprises less than or equal to 1,000 parts by weight of a catalyst byproduct per million parts by weight of product mixture.
6. The product mixture of claim 4 , wherein the aromatic polyether is a polyetherimide and the product mixture comprises less than or equal to 150 parts by weight of the catalyst per million parts by weight of product mixture.
7. The mixture of claim 2 , wherein the aromatic polyether is a polyetherimide and the less than or equal to 1,000 parts by weight of a catalyst byproduct per million parts by weight of mixture is present.
8. The mixture of claim 2 , wherein the aromatic polyether is a polyetherimide and the less than or equal to 300 parts by weight of a catalyst byproduct per million parts by weight of mixture is present.