Preparation of poly (arylene ether ketones)

Details Preparation of poly (arylene ether ketones) Preparation of poly (arylene ether ketones)

C - Chemistry, Metallurgy

08

G

402/302

C08G 61/12 (2006.01)

Patent

CA 1334039

A method of preparing a poly(arylene ether ketone) by a Friedel-Crafts polymerization wherein a gelled reaction mixture is produced, comprising the steps of: (A) forming, in a first reactor, a reaction mixture for polymerization comprising (I) a monomer system comprising (a) (i) phosgene or an aromatic dicarboxylic acid dihalide and (ii) a substantially stoichiometric amount of a polynuclear aromatic comonomer having two active hydrogen atoms or (b) a polynuclear aromatic carboxylic acid halide having an active hydrogen atom; and (II) a Lewis acid in an amount of at least one equivalent per equivalent of carbonyl groups in the monomer system, plus an amount effective to act as a catalyst for the polymerization; (s) permitting the reaction mixture to polymerize in the first reactor until substantial partial polymerization has occurred, but before substantial gelation of the reaction mixture; (C) transferring the partially polymerized reaction mixture into a second reactor having a nozzle at one end thereof and a piston which, in its retracted position, is at the other end of the second reactor and has a stroke substantially equal to the length of the second reactor; (D) permitting polymerization to continue in the second reactor until a gelled, polymerized reaction mixture containing polymer of the desired molecular weight has been obtained; (E) discharging the gelled, polymerized reaction mixture from the second reactor through the nozzle by stroking the piston the length of the second reactor; and (F) recovering and purifying the polymer.

580624

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