Twin screw extruder, method of making aromatic polycarbonate using a twin screw extruder, and method of removing volatiles from an aromatic polycarbonate melt

An aromatic polycarbonate extruder which is a twin screw extruder for kneading components into a molten aromatic polycarbonate, which extruder comprising at least one module consisting of a neutral kneading unit or forward kneading unit, a back kneading unit and a full-flight unit which are arranged from an upstream side to a downstream side.

An aromatic polycarbonate extruder which is a twin screw extruder for kneading compounds into a molten aromatic polycarbonate, which extruder comprising at least one module consisting of material seal unit a back kneading unit and a full-flight unit which are conjoined from an upstream side to a downstream side.

A method of kneading components into an aromatic polycarbonate using a twin screw extruder comprising at least one module consisting of a kneading unit, a material seal unit, a back kneading unit and a full-flight unit which are arranged from an upstream side to a downstream side, the method comprising the steps of:

• (1) supplying the components to the area of the kneading unit of the module of the twin screw extruder;
• and
• (2) discharging volatile components from the area of the full-flight unit of the module of the twin screw extruder as required.

A method of kneading components into an aromatic polycarbonate using a twin screw extruder comprising at least one module consisting of a neutral kneading unit or forward kneading unit, a back kneading unit and a full-flight unit which are arranged from an upstream side to a downstream side, the method comprising the steps of:

• (1) supplying the components to the area of the neutral kneading unit or forward kneading unit of the module of the twin screw extruder;
• and
• (2) discharging volatile components from the area of the full-flight unit of the module of the twin screw extruder as required.

A method of removing volatile components from a twin screw extruder together with water vapor by supplying water to the twin screw extruder and kneading it into a molten aromatic polycarbonate, the method comprising the steps of:

• supplying water to the twin screw extruder at an absolute pressure of 0.3 to 10 MPa;
• and
• discharging water vapor and volatile components from the extruder at an absolute pressure of 1.333×10 Pa to 1.013×105 Pa.

A twin screw extruder for kneading a thermoplastic resin, which comprises at least one module consisting of a material seal unit, a back kneading unit and a full-flight unit which are arranged from an upstream side to a downstream side.

A twin screw extruder for kneading a thermoplastic resin comprising a module consisting of a neutral kneading unit or forward kneading unit, a back kneading unit and a full-flight unit which are arranged from an upstream side to a downstream side.