Method for producing shaping material

Patent metadata

Field	Value
Publication number	US-2020032003-A1
Application number	US-201816493504-A
Country	US
Kind code	A1
Filing date	Mar 12, 2018
Priority date	Mar 21, 2017
Publication date	Jan 30, 2020
Grant date	—

Abstract

Provided is a method for producing a shaping material that contains a cyclic olefin polymer and has a low content of a volatile impurity. This method for producing a shaping material is a method which includes passing a raw-material resin in a molten state through an extruder to produce a shaping material, and in which the extruder is 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.

First claim

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 is 5% by volume or less.

2 . The method for producing a shaping material according to claim 1 , wherein a content ratio of a compound that has a boiling point of lower than 200° C. with respect to the whole raw-material resin is 15 to 50 ppm in terms of n-decane when components of the raw-material resin are analyzed by the following dynamic headspace-gas chromatography/mass spectrometry:
a sample container composed of a glass tube having an inner diameter of 4 mm, in which 100 mg of the raw-material resin is charged, is connected to a gas collection tube that have been cooled by liquid nitrogen, and then the sample container is heated at 200° C. for 30 minutes in a high-purity helium stream, followed by continuously collecting gas released from the raw-material resin into the gas collection tube; and
the collected gas is subjected to thermal desorption-gas chromatography-mass spectrometry using n-decane as an internal standard, and the amount of the gas released from the raw-material resin is calculated in terms of n-decane.

3 . The method for producing a shaping material according to claim 1 , wherein the extruder is a twin-screw extruder.

4 . The method for producing a shaping material according to claim 1 , wherein the temperature of the molten raw-material resin in the cylinder is 290° C. to 330° C.

5 . The method for producing a shaping material according to claim 1 , wherein the pressure at the fluid discharge port is 500 to 3,000 kPa.

6 . The method for producing a shaping material according to claim 1 , wherein the content ratio of a compound that has a boiling point of lower than 200° C. with respect to the whole shaping material is 3 ppm or less in terms of n-decane when components of the shaping material are analyzed by the following dynamic headspace-gas chromatography/mass spectrometry:
a sample container composed of a glass tube having an inner diameter of 4 mm, in which 100 mg of the shaping material is charged, is connected to a gas collection tube that have been cooled by liquid nitrogen, and then the sample container is heated at 200° C. for 30 minutes in a high-purity helium stream, followed by continuously collecting gas released from the shaping material into the gas collection tube; and
the collected gas is subjected to thermal desorption-gas chromatography-mass spectrometry using n-decane as an internal standard, and the amount of the gas released from the shaping material is calculated in terms of n-decane.

Assignees

• Zeon Corp

Inventors

• Ariura Eito
• Yamada Satoshi

Classifications

• B29B7/42

  with screw or helix · CPC title

• B29B7/94

  Liquid charges · CPC title

• B29B7/489

  Screws (B29B7/482 takes precedence) · CPC title

• B29B7/845 Primary

  Venting, degassing or removing evaporated components in devices with rotary stirrers · CPC title

• C08J2345/00

  Characterised by the use of homopolymers or copolymers of compounds having no unsaturated aliphatic radicals in side chain, and having one or more carbon-to-carbon double bonds in a carbocyclic or in a heterocyclic ring system; Derivatives of such polymers · CPC title