Process for the preparation of a reinforced polyamide by extrusion

A process for the production of a reinforced polyamide (rP) in an extruder, wherein the extruder comprises a reaction zone and a devolatilization zone, wherein the reaction zone comprises a first section, a second section, and a third section, comprising:

• a) providing a first mixture (M1) comprising component
• (A) at least one lactam,
• b) providing a second mixture (M2) comprising component
• (B) at least one catalyst,
• c) providing a third mixture (M3) comprising component
• (C) at least one activator,
• d) adding the first mixture (M1), the second mixture (M2) and the third mixture (M3) into the first section of the reaction zone of the extruder to obtain a polymerizable mixture (pM) in the extruder,
• e) adding at least one carbon material into the second section of the reaction zone of the extruder to the polymerizable mixture (pM) obtained in step d), to obtain a carbon containing polymerizable mixture (cpM) in the extruder,
• f) polymerizing of the carbon containing polymerizable mixture (cpM) obtained in step e) in the third section of the reaction zone of the extruder to obtain a reinforced raw polyamide (rrP),
• g) devolatilizing the reinforced raw polyamide (rrP) obtained in step f) in the devolatilization zone of the extruder to obtain the reinforced polyamide (rP), wherein the devolatilization zone comprises pressure built-up zones and stress relief zones and wherein a stripping fluid is added into the pressure built-up zones of the devolatilization zone of the extruder.