Patent ID: 11905380
Assignee: ZEON CORPORATION
Field: Other special machines (Mechanical engineering)
Classification: CPC B  C | IPC B  C

Claim 0:
1. A method for producing a shaping material by passing a raw-material resin that contains a cyclic olefin polymer in a molten state through an extruder,
the extruder being equipped with a cylinder, a screw housed within the cylinder, a resin introduction port for introducing the raw-material resin into the cylinder, a resin discharge port for discharging the molten resin from the cylinder, a fluid injection port for injecting carbon dioxide or water into the cylinder between the resin introduction port and the resin discharge port, and a fluid discharge port for removing fluid in the cylinder by suction downstream of the fluid injection port and between the resin introduction port and the resin discharge port;
the method comprising:
injecting 1 to 6 parts by mass of carbon dioxide or water per 100 parts by mass of the raw-material resin into the cylinder from the fluid injection port while transporting the molten raw-material resin within the cylinder to bring carbon dioxide or water into contact with the molten raw-material resin, and discharging fluid in the cylinder from the fluid discharge port, thereby removing a volatile compound in the raw-material resin; and
cooling and solidifying the molten resin discharged from the resin discharge port, wherein
the rotation number of the screw during extrusion of the molten raw-material resin is 150 rpm or higher, and
the oxygen concentration of the gas phase within the cylinder when the molten resin is brought into contact with carbon dioxide or water while being transported within the cylinder is 5% by volume or less.