Use of heterogeneous catalysts in methods for the production...

Details Use of heterogeneous catalysts in methods for the production... Use of heterogeneous catalysts in methods for the production...

C - Chemistry, Metallurgy

08

G

C08G 69/18 (2006.01) C08G 69/04 (2006.01) C08G 69/20 (2006.01) C08G 69/28 (2006.01)

Patent

CA 2359074

The invention relates to the use of metal oxides as heterogeneous catalysts in a method for the production of polyamides by polymerization of lactams and possibly other polyamide-forming monomers. According to said method the metal oxides are used in a form which permits their mechanical separation from the reaction mixture and during or at the end of polymerization are separated from the reaction mixture so as to reduce the content of extractable compounds in the polyamide obtained in this way.

L'invention concerne l'utilisation d'oxydes métalliques comme catalyseurs hétérogènes dans un procédé de production de polyamides par polymérisation de lactames et éventuellement d'autres monomères pouvant former des polyamides, procédé selon lequel les oxydes métalliques sont utilisés sous une forme permettant une séparation mécanique du mélange réactionnel, et sont éliminés du mélange réactionnel au cours ou à l'issue de la polymérisation, pour réduire la teneur en composés extractibles dans le polyamide obtenu.

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