Method For Producing Polyetherketoneketone

Abstract: The invention relates to a method for producing a polyetherketoneketone, comprising: - contacting an aromatic ether or a mixture of aromatic ethers, comprising at least 50 mol% of 1,3-bis(4-phenoxybenzoyl)benzene, 1,4-bis(4-phenoxybenzoyl)benzene or a mixture thereof, relative to the total number of moles of aromatic ether(s), with an acyl chloride or a mixture of acyl chlorides, and a Lewis acid, in all or part of a reaction solvent, so as to form a reaction mixture, the 1,3-bis(4-phenoxybenzoyl)benzene and/or the 1,4-bis(4-phenoxybenzoyl)benzene being essentially not dissolved in the reaction solvent at the end of the contacting step; and, - polymerizing the reaction mixture, the polymerization being carried out, at least in part, at a temperature Tp above or equal to 50°C; the method being characterized in that it comprises a gradual step of heating the reaction mixture until an acceleration of the polymerization reaction is attained, the gradual heating step being carried out at a mean heating rate chosen from a range of from 0.65°C/minute to 2.5°C/minute; one or more chain stoppers being optionally added during the method.

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