Polyphenylene sulfide microparticles

Patent metadata

Field	Value
Publication number	US-2016311995-A1
Application number	US-201415105686-A
Country	US
Kind code	A1
Filing date	Dec 17, 2014
Priority date	Dec 25, 2013
Publication date	Oct 27, 2016
Grant date	—

Abstract

Polyphenylene sulfide microparticles have a linseed oil absorption amount of 40 to 1,000 mL/100 g and a number average particle diameter of 1 to 200 μm. The porous PPS microparticles have a large specific surface area and therefore promote fusion of particles when molded into various molded bodies by applying thermal energy, thus enabling formation or molding of a coating layer of particles at a lower temperature in a shorter time. The porous PPS microparticles have a porous shape and therefore enable scattering light in multiple directions and suppression of specific reflection of reflected light in a specific direction, thus making it possible to impart shading effect and matte effect when added to a medium.

First claim

1 - 9 . (canceled)

10 . Polyphenylene sulfide microparticles having a linseed oil absorption amount of 40 to 1,000 mL/100 g and a number average particle diameter of 1 to 200 μm.

11 . The polyphenylene sulfide microparticles according to claim 10 , having a sphericity of 80 or more.

12 . The polyphenylene sulfide microparticles according to claim 10 , having a particle diameter distribution index of 1 to 3.

13 . The polyphenylene sulfide microparticles according to claim 10 , having a melting point of 210° C. to 270° C.

14 . The polyphenylene sulfide microparticles according to claim 10 , wherein a polyphenylene sulfide resin is a copolymer of a p-phenylene sulfide unit, and an m-phenylene sulfide unit and/or an o-phenylene sulfide unit, and includes the m-phenylene sulfide unit and/or the o-phenylene sulfide unit in a proportion of 3 to 30% by mass based on the total phenylene sulfide units.

15 . A dispersion comprising the polyphenylene sulfide microparticles according to claim 10 .

16 . A method of producing polyphenylene sulfide microparticles, which comprises, in a system where a polyphenylene sulfide resin (A), a polymer (B) different from the polyphenylene sulfide resin, and an organic solvent (C) are mixed and dissolved to cause phase separation into two phases of a solution phase containing the polyphenylene sulfide resin (A) as a main component and a solution phase containing the polymer (B) as a main component, the steps of:
mixing and dissolving the polyphenylene sulfide resin (A), the polymer (B), and the organic solvent (C) at a temperature Td (° C.); applying a shear force to the thus obtained solution to form an emulsion; and bringing a poor solvent of the polyphenylene sulfide resin (A) into contact with the emulsion at a temperature Tp (° C.) to precipitate the polyphenylene sulfide resin (A), wherein a temperature Tp (° C.) is at least 10° C. lower than a temperature Td (° C.).

17 . The method according to claim 16 , wherein the polyphenylene sulfide resin (A) has a melting point of 210° C. to 270° C.

18 . The method of according to claim 16 , wherein the polyphenylene sulfide resin (A) is a copolymer of a p-phenylene sulfide unit, and an m-phenylene sulfide unit and/or an o-phenylene sulfide unit, and includes the m-phenylene sulfide unit and/or the o-phenylene sulfide unit in a proportion of 3 to 30% by mass based on the total phenylene sulfide units.

Assignees

• Toray Industries

Inventors

• OTSUBO Takahiko
• Asano Itaru
• Wakahara Yoko
• Takezaki Hiroshi

Classifications

• C08J9/16 Primary

  Making expandable particles · CPC title

• C08J2481/06

  Polysulfones; Polyethersulfones · CPC title

• C08J3/11

  from solid polymers · CPC title

• C08J9/28

  by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum · CPC title

• C08J2205/044

  Micropores, i.e. average diameter being between 0,1 micrometer and 0,1 millimeter · CPC title