Title:
METHOD FOR PRODUCING POLYARYLENE SULFIDE
Document Type and Number:
WIPO Patent Application WO/2021/131985
Kind Code:
A1
Abstract:
Provided is a method for producing polyarylene sulfide ("PAS" hereinafter), the method making it possible to shorten the time required for a cooling step for forming granular PAS and to suppress any increase in the average particle size of the resultant granular PAS. The method for producing PAS according to the present invention includes: a first polymerization step for heating a mixture that contains an organic polar solvent, a sulfur source, water, a polyhaloaromatic compound, and an alkali metal hydroxide in the presence of at least one auxiliary agent selected from carboxylates, etc., to initiate a polymerization reaction so as to generate a reaction mixture that contains a prepolymer having a polyhaloaromatic compound conversion rate of 50 mol% or higher; a phase separation agent addition step for subsequently adding a phase separation agent to the reaction mixture; a second polymerization step for subsequently continuing the polymerization reaction; and a cooling step for subsequently cooling the reaction mixture. In the cooling step, the coolant is added to the reaction mixture at a temperature ranging from at least 5°C above the maximum thickening temperature to less than 250°C, and the cooling rate at the maximum thickening temperature ranges from 2.2°C/min to 6.0°C/min (inclusive).
Inventors:
SATO TAKESHI (JP)
SUZUKI YOSHINORI (JP)
SUZUKI YOSHINORI (JP)
Application Number:
PCT/JP2020/047030
Publication Date:
July 01, 2021
Filing Date:
December 16, 2020
Export Citation:
Assignee:
KUREHA CORP (JP)
International Classes:
C08G75/0209; C08G75/0259; C08G75/0281
Domestic Patent References:
| WO2018147233A1 | 2018-08-16 | |||
| WO2003029328A1 | 2003-04-10 |
Foreign References:
| JP2003246858A | 2003-09-05 | |||
| JP2004051732A | 2004-02-19 |
Attorney, Agent or Firm:
SHOBAYASHI Masayuki et al. (JP)
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