METHOD FOR PRODUCING PARTICULATE POLY(ARYLENE SULFIDE), AND PARTICULATE POLY(ARYLENE SULFIDE)

WIPO Patent Application WO/2018/147233

A1

A method for producing a particulate poly(arylene sulfide) (hereinafter, PAS) is provided by which a particulate PAS having a high particle strength and a low melt viscosity can be obtained in high yield without requiring the use of any special additive, etc. The particulate PAS is also provided. The method according to the present invention produces a particulate PAS having a melt viscosity, as measured at 310°C and 1216 /s, of 1-30 Pa∙s by polymerizing a sulfur source with a dihaloaromatic compound in an organic amide solvent. The method comprises, in the following order, a first polymerization step, in which a reaction mixture containing a given prepolymer is yielded, a phase-separating-agent addition step in which a phase-separating agent is added to the reaction mixture, a second polymerization step, in which the polymerization reaction is continued, and a cooling step in which the reaction mixture is cooled, wherein the phase-separating agent comprises water, the molar ratio of the water to the organic amide solvent in the phase-separating-agent addition step is 0.6-3.0, the polymerization reaction in the second polymerization step is conducted at a temperature in the range of 245-290°C, and the cooling in the cooling step is conducted at a rate of 0.5 °C/min or less.

KONNO AKIHIRO (JP)
TAKAKI KEN-ICHI (JP)

PCT/JP2018/003845

August 16, 2018

February 05, 2018

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KUREHA CORP (JP)

C08G75/0259

WO2016199894A1	2016-12-15
WO2003029328A1	2003-04-10
WO2017170225A1	2017-10-05
WO2010013545A1	2010-02-04

JP2004051732A	2004-02-19
JP2001089569A	2001-04-03

SHOBAYASHI Masayuki et al. (JP)

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