Continuous preparation of copolyamides from caprolactam and...

Details Continuous preparation of copolyamides from caprolactam and... Continuous preparation of copolyamides from caprolactam and...

C - Chemistry, Metallurgy

08

G

402/230

C08G 69/22 (2006.01) C08G 69/36 (2006.01)

Patent

CA 2013148

-13- Copolyamides are prepared by a continuous process in which (a) an aqueous solution of salts of equimolar amounts of diamines and dicarboxylic acids is passed, under superatmospheric presure and with simultaneous evaporation of water, through a tubular precondensation zone with formation of a vapor phase and a prepolymer at above the melting point of the prepolymer, (b) the vapor phase is separated from the prepolymer melt, (c) the vapor phase is separated in a column into steam and an aqueous diamine solution, and the aqueous solution containing diamines is recycled to the polymerization, (d) the prepolymer melt is mixed with molten caprolactam at polyamide-forming temperatures, and (e) the mixture of prepolymer and caprolactam is passed downward through a vertical polymerization tube at polyamide-forming temperatures and a copolyamide is obtained.

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