Bayer Aktiengesellschaft

Dieter G&ouml;bbels

Konrad Triebeneck

Heinrich Haupt

Andreas Gittinger

Heinrich Morhenn

Klemens Kohlgr&uuml;ber

Frank Weyrich

Cliff Scherer

A process for using low-molecular weight compounds that are water-extracted from (co)polyamides in the production of polyamide is disclosed. The process entails reacting these compounds with 10 to 15 wt. % water for a period of 3.5 to 6 hours at a temperature of 220&deg; C. to 270&deg; C., and polymerizing the resulting product along with caprolactam.

Process for the production of polyamide

A process for producing a polyamide or copolyamide freed from volatile constituents by removing the volatile constituents, in particular the monomers and dimers, in at least two stages from the polymer melt by using an, in particular, gaseous entrainer is described. The invention also relates to polyamide compositions made of polyamide 6 or a copolyamide with a reduced volatile constituent content, as well as moulding compositions made of the above-mentioned polyamides, and moulded articles and fibers which are produced from these moulding compositions.

Polyamide composition and method for producing the same

A process for removing low molecular weight constituents from polyamide 6 or from copolyamides based on caprolactam (herein (co)polyamide) is disclosed. The process comprise subjecting the (co)polyamide to liquid-extraction at a temperature which is above the boiling point of the liquid at atmospheric pressure said liquid containing water in an amount of at least 80 percent relative to its weight.

Process and device for extracting polyamide

Growing community of inventors

Kempen, Germany

Dieter Göbbels

Growing community of inventors

Kempen, Germany

Dieter G&ouml;bbels

Dieter Göbbels