Method for manufacturing fine polyarylene sulfide powder, and fine polyarylene sulfide powder

Patent metadata

Field	Value
Publication number	US-10280264-B2
Application number	US-201615559188-A
Country	US
Kind code	B2
Filing date	Mar 31, 2016
Priority date	Mar 31, 2015
Publication date	May 7, 2019
Grant date	May 7, 2019

Abstract

The method for manufacturing a fine PAS powder of the present invention includes: (a) separating granular PAS and a separation liquid from a dispersion liquid containing granular PAS, by solid-liquid separation using at least one screen that has an opening diameter of 75 to 180 μm; (b) performing solid-liquid separation of the separation liquid to obtain a fine PAS powder-containing solid; (c) heating the fine PAS powder-containing solid to reduce an amount of an organic solvent to obtain a wet cake; and (d) washing the wet cake using an aqueous solvent. The water content of the wet cake after heating is at least 30 wt. %.

First claim

The invention claimed is:

1. A method for manufacturing a fine polyarylene sulfide powder, the method comprising:
(a) separating granular polyarylene sulfide and a separation liquid from a dispersion liquid containing granular polyarylene sulfide by solid-liquid separation using at least one screen having an opening diameter in a range of from 75 to 180 μm;
(b) performing solid-liquid separation of the separation liquid, to obtain a fine polyarylene sulfide powder-containing solid;
(c) heating the fine polyarylene sulfide powder-containing solid to reduce an amount of an organic solvent and to obtain a wet cake; and
(d) washing the wet cake using an aqueous solvent;
wherein a water content of the wet cake after heating is 30 wt. % or greater.

2. The manufacturing method according to claim 1 , wherein water is added to the separation liquid in a form of a water-containing organic solvent in the step of adding water.

3. A method for manufacturing a fine polyarylene sulfide powder, the method comprising:
(a) separating granular polyarylene sulfide and a separation liquid from a dispersion liquid containing granular polyarylene sulfide by solid-liquid separation using at least one screen having an opening diameter in a range of from 75 to 180 μm;
(b) performing solid-liquid separation of the separation liquid, to obtain a fine polyarylene sulfide powder-containing solid;
(c) heating the fine polyarylene sulfide powder-containing solid to reduce an amount of an organic solvent and to obtain a wet cake; and
(d) washing the wet cake using an aqueous solvent;
wherein a specific surface area retention A2/A1 is 20% or greater, A1 being a specific surface area of the fine polyarylene sulfide powder contained in the fine polyarylene sulfide powder-containing solid before heating and A2 being a specific surface area of the fine polyarylene sulfide powder contained in the wet cake after heating.

4. The manufacturing method according to claim 1 , wherein the dispersion liquid containing granular polyarylene sulfide is a reaction solution containing granular polyarylene sulfide produced by performing a polymerization reaction of at least one type of sulfur source selected from the group consisting of alkali metal sulfides and alkali metal hydrosulfides with a dihalo aromatic compound in an organic amide solvent.

5. The manufacturing method according to claim 2 , wherein the dispersion liquid containing granular polyarylene sulfide is a reaction solution containing granular polyarylene sulfide produced by performing a polymerization reaction of at least one type of sulfur source selected from the group consisting of alkali metal sulfides and alkali metal hydrosulfides with a dihalo aromatic compound in an organic amide solvent.

6. The manufacturing method according to claim 3 , wherein the dispersion liquid containing granular polyarylene sulfide is a reaction solution containing granular polyarylene sulfide produced by performing a polymerization reaction of at least one type of sulfur source selected from the group consisting of alkali metal sulfides and alkali metal hydrosulfides with a dihalo aromatic compound in an organic amide solvent.

Assignees

• Kureha Corp

Inventors

• Konno Akihiro
• Sato Hiroyuki

Classifications

• C08G75/0277 Primary

  Post-polymerisation treatment (chemical after-treatment C08G75/0286) · CPC title

• C08G75/0209

  derived from monomers containing one aromatic ring · CPC title

• C08G75/0281

  Recovery or purification · CPC title

• C08J3/12 Primary

  Powdering or granulating · CPC title

• C08G75/0259

  metal hydrogensulfides · CPC title