Method for preparing polyamides from lactams and polyamide...

C - Chemistry – Metallurgy – 08 – G

Patent

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C08G 69/20 (2006.01) C08G 69/04 (2006.01) C08G 69/16 (2006.01) C08G 69/18 (2006.01)

Patent

CA 2375648

The invention relates to a method for preparing polyamides by reacting at least one lactam and optionally other polyamide-forming monomers with aqueous monomeric and oligomeric extracts obtained when the polymer is extracted with water in the production of polyamides, whereby the water content of the reaction mixture ranges from 0.5 to 13 percent by weight. According to said method, reaction is carried out in the presence of metal oxides, beta zeolites, sheet silicates or silica gels which may de doped as heterogeneous catalysts. The heterogeneous catalysts are used in a form enabling mechanical separation from the reaction mixture and removal from the reaction mixture during or after conclusion of polymerization

L'invention concerne un procédé de production de polyamides par réaction d'au moins un lactame et éventuellement d'autres monomères formant des polyamides avec des extraits monomères et oligomères aqueux produits lors de la production de polyamides, pendant l'extraction du polymère avec de l'eau. La teneur en eau du mélange réactionnel est comprise entre 0,5 et 13 % en poids. Selon ce procédé, la réaction s'effectue en présence de catalyseurs hétérogènes sous la forme d'oxydes métalliques, de béta-zéolithes, de phyllosilicates ou de gels de silice pouvant être dopés. Ces catalyseurs hétérogènes sont utilisés sous une forme permettant leur séparation mécanique du mélange réactionnel, et sont éliminés dudit mélange réactionnel au cours de la polymérisation ou à l'issue de cette dernière.

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