Manufacture of polyamides
AssigneeBASF SE
InventorsClaus Cordes, Franz Zahradnik
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Abstract
A process for the manufacture of polyamides from .epsilon.-caprolactam and/or other polyamide-forming starting compounds by polymerization and subsequent extraction of the polymer. The extract containing solvent, monomer and oligomers is concentrated in the absence of atmospheric oxygen, the surfaces which come into contact with the extract being made of materials which are inert under the conditions of the concentration process, and the concentrate, without further purification or separation, is polymerized by itself or together with other polyamide-forming starting compounds.
Claims9
In a process for the manufacture of polyamides from .epsilon.-caprolactam and/or other polyamide-forming starting compounds by polymerization and subsequent extraction of the polymer, the improvement comprising:
- concentrating the aqueous extract containing water, monomer and oligomers in the absence of atmospheric oxygen, wherein the surfaces which comes into contact with the extract are made of materials which are inert under the conditions of the concentration process, and polymerizing the concentrate, without further purification or separation, by itself or together with other polyamide-forming starting materials.
Dependencies are inferred from the claim text.