Continuous polymerization process for preparing polyamides...

Details Continuous polymerization process for preparing polyamides... Continuous polymerization process for preparing polyamides...

C - Chemistry, Metallurgy

08

G

C08G 69/00 (2006.01) C08G 69/04 (2006.01) C08G 69/16 (2006.01)

Patent

CA 2343185

A continuous process for the polymerization of omega-aminonitriles (e.g., 6- aminocapronitriles) which is introduced at the top of a vertical multistage reactor being swept countercurrently with steam and polyamide (e.g., nylon 6) is recovered near the bottom of the vertical multistage reactor. By virtue of independent temperature control at each of the vertical stages of the multistage reactor, the polyamide recovered is typicaly characterized as having unreacted nitrile end groups of less than 20 gram equivalents per million grams of polyamide, and less than 25 gram equivalents of secondary amine branching per million grams of polyamide.

L'invention concerne un procédé continu de polymérisation faisant intervenir des oméga-aminonitriles (par exemple, 6-aminocapronitriles) placés au-dessus d'un réacteur vertical multi-étages balayé à contre-courant par un flux. La polyamide (par exemple, du nylon 6) est récupérée près du fond du réacteur vertical multi-étages. Grâce à un réglage de la température adapté à chacun des étages verticaux du réacteur multi-étages, la polyamide récupérée se caractérise en ce qu'elle présente des groupes terminaux de nitrile n'ayant pas réagi, qui sont inférieurs à 20 grammes d'équivalents par million de grammes de polyamide et qui sont inférieurs à 25 grammes d'équivalents de ramifications d'amine secondaire par million de grammes de polyamide.

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