Anionic polymerization of lactams in an extruder with controlled output rate
AssigneeAto Chimie
InventorsMichel Biensan, Philippe Potin
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Abstract
Anionic polymerization of lactams is carried out in an extruder into which at least one lactam, at least one catalyst and at least one activating agent are introduced and wherein the mixture of said substances is polymerized prior to being extruded through an extrusion die. The output rate of the polymerized substance is controlled by transfer means, such as a metering pump, arranged between the outlet of the body of the extruder and the extrusion die.
Claims4
In a method for the anionic polymerization of lactams in an extruder wherein at least one lactam having 6 to 12 carbon atoms in the lactam ring, at least one catalyst and at least one activator are introduced into the extruder and wherein a polymer is formed in said extruder and said polymer is extruded through an extrusion die, the improvement which comprises passing the polymer through a flow control zone interposed between the extruder and the extrusion die wherein the flow of the polymer from the extruder to the extrusion die is controlled at a substantially constant rate.
Dependencies are inferred from the claim text.