Production of polyamide
AssigneeBayer Aktiengesellschaft
InventorsSven Gestermann, Ralph Ulrich
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Abstract
The present invention provides a method for the production of polyamide 6 by the hydrolytic polymerization of ε-caprolactam, in which, in the first step, caprolactam ring opening occurs under the action of water and, in the following steps, polycondensation is performed at low temperatures under anhydrous conditions.
Claims10
In a process for the production of polyamide 6 or copolyamide based on polyamide 6 in at least two stages, in which a polyamide, preferably prepolyamide from the first stage(s) is melt postcondensed, the improvement comprising:
- melt postcondensing with an increased melt surface area with a surface area/volume ratio of >20 m−1, using a stream of inert gas and/or with a reduction in overall pressure, and performing melt postcondensation at a temperature between melting point and melting point +40° C.
The process according to one of the preceding claims, wherein delactamisation proceeds simultaneously during the postcondensation.
Dependencies are inferred from the claim text.