ALEXANDRIA, Va., March 24 -- United States Patent no. 12,583,969, issued on March 24, was assigned to ARKEMA FRANCE (Puteaux, France).
"Method for the continuous preparation of polyamide prepolymers" was invented by Sebastien Quinebeche (Serquigny, France), Thierry Briffaud (Serquigny, France) and Gerald Romazini (Serquigny, France).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to a method for continuously preparing a polyamide prepolymer, the viscosity in solution of which is comprised between 0.25 dL/g and 0.70 dL/g, as measured according to ISO 307:2007 in m-cresol at 20deg C., the method being characterized in that it comprises a step of polycondensation on the basis of one ...