Method of making polyetherimide
A method of making a polyetherimide comprises: combining a bisphenol A dianhydride, p-phenylene diamine and a halogenated aromatic solvent to form a reactant solution; heating the reactant solution to a temperature of 205° C. to 330° C. at a pressure sufficient to prevent boiling to afford a reaction solution; removing water from the reaction solution; maintaining the reaction solution at a temperature of 205° C. to 330° C. and a pressure sufficient to prevent boiling for 10 minutes to 5 hours to form a product mixture comprising the polyetherimide and solvent; and isolating the polyetherimide.
1. A method of making a polyetherimide comprising:
combining a bisphenol A dianhydride, p-phenylene diamine and a halogenated aromatic solvent to form a reactant solution;
heating the reactant solution to a temperature of 205° C. to 330° C. at a pressure sufficient to prevent boiling to afford a reaction solution;
removing water from the reaction solution;
maintaining the reaction solution at a temperature of 205° C. to 330° C. and a pressure sufficient to prevent boiling for 10 minutes to 5 hours to form a product mixture comprising the polyetherimide and solvent; and
isolating the polyetherimide.
2. A method of making a polyetherimide comprising:
combining bisphenol A dianhydride and a halogenated aromatic solvent to form a reactant solution;
heating the reactant solution to a temperature of 205° C. to 330° C. at a pressure sufficient to prevent boiling,
adding p-phenylene diamine to the heated pressurized reactant solution at a temperature of 205° C. to 330° C. and a pressure sufficient to prevent boiling to form a reaction solution;
maintaining the reaction solution at a temperature of 205° C. to 330° C. and a pressure sufficient to prevent boiling to afford a product mixture comprising the polyetherimide and solvent; and
isolating the polyetherimide.
3. The method of claim 1 , wherein the reactant solution has a solids content of 10 to 60%.
4. The method of claim 2 , wherein the p-phenylene diamine is added from below the surface of the reactant solution.
5. The method of claim 1 , further comprising combining a chain stopper with the bisphenol A dianhydride, p-phenylene diamine and a halogenated aromatic solvent.
6. A method of making a polyetherimide comprising:
combining a bisphenol A dianhydride, p-phenylene diamine and a halogenated aromatic solvent to form a reactant solution;
heating the reactant solution to reflux and removing water to afford a reaction slurry;
heating the reactant slurry to a temperature of 205° C. to 330° C. at a pressure to afford a reaction solution;
removing water from the reaction solution;
maintaining the reaction solution at a temperature of 205° C. to 330° C. and a pressure sufficient to prevent boiling for 10 minutes to 5 hours to form a product mixture comprising the polyetherimide and solvent; and
isolating the polyetherimide.
7. The method of claim 6 , wherein the reactant solution has a solids content of 10 to 60%.
8. The method of claim 6 , wherein the reactant slurry is heated to a temperature of 220 to 260° C. and the reaction slurry is maintained at a temperature of 220 to 260° C.
9. The method of claim 6 , further comprising combining a chain stopper with the bisphenol A dianhydride, p-phenylene diamine and a halogenated aromatic solvent.
10. The method of claim 1 , wherein the product mixture is cooled to precipitate the polyetherimide, and the polyetherimide is isolated by filtration, centrifugation or a combination comprising at least one of the foregoing.
11. The method of claim 1 , wherein the polyetherimide is isolated using a devolatizing extruder.
12. The method of claim 1 , wherein the polyetherimide is isolated using an agitated thin film evaporator.
13. The method of claim 2 , wherein the reactant solution has a solids content of 10 to 60%.
14. The method of claim 2 , further comprising combining a chain stopper with the bisphenol A dianhydride, p-phenylene diamine and a halogenated aromatic solvent.
15. The method of claim 2 , wherein the product mixture is cooled to precipitate the polyetherimide, and the polyetherimide is isolated by filtration, centrifugation or a combination comprising at least one of the foregoing.
16. The method of claim 2 , wherein the polyetherimide is isolated using a devolatizing extruder.
17. The method of claim 2 , wherein the polyetherimide is isolated using an agitated thin film evaporator.
18. The method of claim 6 , wherein the product mixture is cooled to precipitate the polyetherimide, and the polyetherimide is isolated by filtration, centrifugation or a combination comprising at least one of the foregoing.
19. The method of claim 6 , wherein the polyetherimide is isolated using a devolatizing extruder.
20. The method of claim 6 , wherein the polyetherimide is isolated using an agitated thin film evaporator.