PROCESS FOR PREPARING POLYARYLENE ETHER KETONES
A process for preparing a polyarylene ether ketone by reacting an aromatic dihalogen compound with a bisphenol in the presence of alkali metal carbonate and/or alkaline earth metal carbonate in a high-boiling solvent, where the molar mass is established by, in the course of the polycondensation, bringing the molar mass to a target value by again adding a bisphenol or an aromatic dihalogen compound to the reaction.
1 . A process for preparing a polyarylene ether ketone, comprising
adding an aromatic dihalogen compound and a bisphenol to a reactor and conducting a polycondensation reaction in the presence of one or more of an alkali metal carbonate and an alkaline earth metal carbonate in a high-boiling solvent;
again adding, during the course of the polycondensation, at least one of a bisphenol and an aromatic dihalogen compound in an amount to achieve a target molar mass of the polyarylene ether ketone.
2 . The process according to claim 1 , wherein if the bisphenol is deficient in the reaction and the polycondensation reaction has abated, the process further comprises starting the reaction again by adding a bisphenol.
3 . The process according to claim 1 , wherein if the aromatic dihalogen compound is deficient and the polycondensation reaction has abated, the process further comprises starting the reaction again by adding an aromatic dihalogen compound.
4 . The process according to claim 1 , which further comprises stopping the polycondensation reaction by adding an organic halogen compound.
5 . The process according to claim 1 , wherein once the polycondensation reaction has abated, the molar mass is lowered by metering an organic monohalogen compound into the reaction.
6 . The process according to claim 5 , wherein the organic monohalogen compound is methyl chloride.
7 . The process according to claim 1 , wherein the aromatic dihalogen compound is 4,4′-difluorobenzophenone.
8 . The process according to claim 1 , wherein the bisphenol is hydroquinone.
9 . The process according to claim 8 , wherein the aromatic dihalogen compound is 4,4′-difluorobenzophenone.
10 . The process according to claim 1 , wherein the molar ratio of the bisphenol to the aromatic dihalogen compound is from 1:1.001 to 1:1.105.
11 . The process according to claim 10 , wherein the bisphenol is hydroquinone.
12 . The process according to claim 10 , wherein the aromatic dihalogen compound is 4,4′-difluorobenzophenone.
13 . The process according to claim 12 , wherein the bisphenol is hydroquinone.