Method of manufacturing polycarbonate resin pellets

Patent metadata

Field	Value
Publication number	US-2018355166-A1
Application number	US-201615776689-A
Country	US
Kind code	A1
Filing date	Nov 8, 2016
Priority date	Nov 20, 2015
Publication date	Dec 13, 2018
Grant date	—

Abstract

Provided is a method of producing a polycarbonate resin pellet containing a polycarbonate resin serving as a component (A), a silicone compound serving as a component (B), and an ester of an aliphatic carboxylic acid having 12 to 22 carbon atoms and glycerin serving as a component (C), the production method including a step including introducing a blend containing the component (A), the component (B), and the component (C) into an extruder, and melt-kneading the blend in the extruder under such a condition that a temperature of a molten resin at an outlet of the extruder is 260° C. or more and 325° C. or less, followed by extrusion molding to provide a polycarbonate resin pellet, the resultant polycarbonate resin pellet containing 0.01 part by mass or more and 0.25 part by mass or less of the component (B), and 0.015 part by mass or more and 0.25 part by mass or less of the component (C) with respect to 100 parts by mass of the component (A).

First claim

1 . A method of producing a polycarbonate resin pellet containing a polycarbonate resin serving as a component (A), a silicone compound serving as a component (B), and an ester of an aliphatic carboxylic acid having 12 to 22 carbon atoms and glycerin serving as a component (C),
the production method comprising a step including introducing a blend containing the component (A), the component (B), and the component (C) into an extruder, and melt-kneading the blend in the extruder under such a condition that a temperature of a molten resin at an outlet of the extruder is 260° C. or more and 325° C. or less, followed by extrusion molding to provide a polycarbonate resin pellet, the resultant polycarbonate resin pellet containing 0.01 part by mass or more and 0.25 part by mass or less of the component (B), and 0.015 part by mass or more and 0.25 part by mass or less of the component (C) with respect to 100 parts by mass of the component (A).

2 . The method of producing a polycarbonate resin pellet according to claim 1 , wherein a sodium content in the component (B) to be used in the blend is 15 ppm by mass or less.

3 . The method of producing a polycarbonate resin pellet according to claim 1 , wherein the component (B) comprises a silicone compound in which at least one kind selected from the group consisting of a hydrogen atom, an alkoxy group, a hydroxy group, an epoxy group, and a vinyl group is bonded to a silicon atom.

4 . The method of producing a polycarbonate resin pellet according to claim 1 , wherein a sodium content in the component (A) to be used in the blend is 200 ppb by mass or less.

5 . The method of producing a polycarbonate resin pellet according to claim 1 , wherein a sodium content in the component (C) to be used in the blend is 2 ppm by mass or less.

6 . The method of producing a polycarbonate resin pellet according to claim 1 , wherein the component (C) comprises an ester of stearic acid and glycerin.

7 . The method of producing a polycarbonate resin pellet according to claim 6 , wherein the ester of stearic acid and glycerin comprises glycerin monostearate.

8 . The method of producing a polycarbonate resin pellet according to claim 1 , wherein the component (A) comprises an aromatic polycarbonate resin.

9 . The method of producing a polycarbonate resin pellet according to claim 1 , wherein the component (A) has a viscosity-average molecular weight of 9,000 or more and 30,000 or less.

10 . The method of producing a polycarbonate resin pellet according to claim 1 , wherein the component (A) has a viscosity-average molecular weight of 10,000 or more and 20,000 or less.

11 . The method of producing a polycarbonate resin pellet according to claim 1 , wherein a water content in the component (A) is 50 ppm by mass or more and 3,000 ppm by mass or less.

12 . The method of producing a polycarbonate resin pellet according to claim 1 , wherein a water content in the blend is regulated by introducing 0.01 part by mass or more and 0.5 part by mass or less of water into the extruder.

13 . The method of producing a polycarbonate resin pellet according to claim 12 , wherein an electrical conductivity of the water to be used in the regulation of the water content in the blend measured at 25° C. is 1 μS/m or less.

14 . The method of producing a polycarbonate resin pellet according to claim 13 , wherein the water to be used in the regulation of the water content in the blend is supplied from a raw material-loading port of the extruder into the extruder.

15 . The method of producing a polycarbonate resin pellet according to claim 1 , wherein the extruder has a vent and the extrusion molding is performed under such a condition that a vacuum degree at an outlet of the vent is −700 mmHg or less.

Assignees

• Idemitsu Kosan Co

Inventors

• Watanabe Nobuhiro

Classifications

• B29K2069/00

  Use of PC, i.e. polycarbonates {or derivatives thereof}, as moulding material · CPC title

• C08J3/12 Primary

  Powdering or granulating · CPC title

• C08L69/00 Primary

  Compositions of polycarbonates; Compositions of derivatives of polycarbonates · CPC title

• B29B9/06

  in the form of filamentary material, e.g. combined with extrusion · CPC title

• C08L83/04

  Polysiloxanes · CPC title