Manufacture of polyamide film-forming materials

Details Manufacture of polyamide film-forming materials Manufacture of polyamide film-forming materials

C - Chemistry, Metallurgy

08

K

18/1213, 400/784

C08K 3/34 (2006.01) C08G 69/16 (2006.01) C08J 3/22 (2006.01) C08L 77/00 (2006.01)

Patent

CA 1050688

ABSTRACT OF THE DISCLOSURE: Process for the continuous manufacture of polymeric starting materials for high-grade transparent thin sheeting, wherein (a) {-caprolactam is continuously agitated in a first reaction zone under polyamide-forming conditions at temperatures of from 240° to 290°C until at least 20% and preferably at least 35% of the {-caprolactam has reacted, (b) magnesium silicate having a particle size of less than 30 µm is then added to the melt to give magnesium silicate concentrations in the reaction mixture of from 0.0005 to 0.5% and preferably from 0.0001 to 0.01%, and (c) the melt is then polymerized in further stages to completion until the relative viscosity is from 2.4 to 3.3 and preferably from 2.5 to 2.8.

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