Process for the continuous hydrolytic polymerization of...

Details Process for the continuous hydrolytic polymerization of... Process for the continuous hydrolytic polymerization of...

C - Chemistry, Metallurgy

08

G

C08G 69/16 (2006.01)

Patent

CA 2142667

Continuous hydrolytic polymerization of laurolactam is achieved in a simple and economical manner by a process in which laurolactam and water are metered in via a pump, if desired passed through a reactor having largely ideal backmixing, subsequently reacted in a tube reactor to give a prepolymer which is then depressurized via a depressurization valve into a degassing apparatus from which it is discharged, wherein a) the water content in the prepolymerization is from 7 to 20% by weight, b) the reaction temperature in the prepolymerization is from 280 to 320o C and c) the depressurization valve is regulated in such a way that the working pressure is above the partial pressure of water vapour of the reaction mixture. The polyamide 12 obtained has a low residual monomer content, excellent colour and is free of gel constituents.

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