Title:
METHOD FOR PRODUCING FLAME RETARDANT POLYCARBONATE RESIN COMPOSITION PELLETS
Document Type and Number:
WIPO Patent Application WO/2023/089929
Kind Code:
A1
Abstract:
Provided is a method for producing flame retardant polycarbonate resin composition pellets using a twin screw extruder, the flame retardant polycarbonate resin composition pellets containing: 30-85 mass% of resin pellets (A) in which a polycarbonate resin having a Mw/Mn ratio of 2.7-3.4 is contained at a quantity of more than 40 mass% in the pellets; not less than 5 mass% and less than 25 mass% of a phosphorus-based flame retardant (B); 0.1-1.0 mass% of polytetrafluoroethylene (C); 0-50 mass% of polycarbonate resin flakes (D); 0-30 mass% of a styrene-based copolymer resin (E); and 0-15 mass% of another additive (F) other than components (B) and (C). In the production method, the components (A) to (F) are kneaded using the twin screw extruder having a screw configuration with a kneading unit that is obtained by combining two or more kinds selected from an R kneading disc, an N kneading disc, an L kneading disc, an L screw, a sealing ring, a mixing screw and a rotor screw. The components are kneaded at a screw rotation speed of 370-830 rpm, with a torque density applied to a screw shaft being 6.0-16.0 Nm/cm3, extruded as a strand from the extruder and then cut.
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Inventors:
TAJIRI TOSHIYUKI (JP)
Application Number:
PCT/JP2022/034299
Publication Date:
May 25, 2023
Filing Date:
September 14, 2022
Export Citation:
Assignee:
MITSUBISHI ENG PLASTICS CORP (JP)
International Classes:
B29B9/06; B29B7/48; B29B9/12; B29C48/40; B29C48/505; C08J3/12; C08L27/18; C08L51/04; C08L69/00
Foreign References:
| JP2003073484A | 2003-03-12 | |||
| JP2015129203A | 2015-07-16 | |||
| JP2000007907A | 2000-01-11 | |||
| JP2020040356A | 2020-03-19 | |||
| JP2019210397A | 2019-12-12 |
Attorney, Agent or Firm:
ATAGO IP (JP)
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