| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a devolatilization extruder capable of suppressing a unreacted monomer and its polymer from being deposited on a portion near a sealing bearing part at operation. <P>SOLUTION: The devolatilization extruder includes a cylinder 10 having a polymer composition feeding port 12, a gas discharge port 14, a polymer exit 16 and a through hole 18, a screw 20 penetrated through the through hole 18 and inserted into the cylinder 10, and a sealing bearing part 30 for supporting a shaft part 20a extended to the outside of the cylinder 10 of the screw 20. The sealing bearing part 30 includes a first shaft seal part 32, a second shaft seal part 34 arranged between the first shaft seal part 32 and the cylinder 10, and a gas introduction port 36 for introducing a gas into the second shaft seal part 34. A clearance becoming a flow passage FP in which the gas introduced from the gas introduction port 36 to the second shaft seal part 34 is discharged into the cylinder is provided between the inner wall surface of the through hole 18 and the surface of the shaft part 20a of the screw 20. <P>COPYRIGHT: (C)2012,JPO&INPIT |
