Resin microparticle production method and resin particles

Patent metadata

Field	Value
Publication number	US-11230628-B2
Application number	US-201716475584-A
Country	US
Kind code	B2
Filing date	Dec 25, 2017
Priority date	Jan 6, 2017
Publication date	Jan 25, 2022
Grant date	Jan 25, 2022

Abstract

A resin microparticle production method includes a step of pulverizing resin particles having a thermoplastic resin as a forming material and having a BET specific surface area of equal to or more than 5 m2/g using an impact type pulverizer.

First claim

The invention claimed is:

1. A resin microparticle production method, comprising:
a step of pulverizing resin particles which are a thermoplastic resin of an aromatic polyether sulfone having a BET specific surface area of equal to or more than 5 m 2 /g using an impact type pulverizer;
wherein a median particle diameter D 50 of the resin particles is equal to or more than 200 and wherein a median particle diameter D 50 of the resin microparticle is equal to or less than 100 μm.

2. The resin microparticle production method according to claim 1 , further comprising:
a step of synthesizing the thermoplastic resin by polymerizing a monomer in a solvent;
a step of precipitating the thermoplastic resin from a reaction mixture obtained in the synthesizing step to obtain intermediate particles containing the thermoplastic resin; and
a step of washing the obtained intermediate particles in a fixed phase to obtain the resin particles, prior to the pulverizing step.

3. The resin microparticle production method according to claim 1 ,
wherein the thermoplastic resin has a sulfonyl group in the main chain.

4. The resin microparticle production method according to claim 3 ,
wherein the thermoplastic resin is aromatic polyether sulfone.

5. The resin microparticle production method according to claim 1 ,
wherein a reduced viscosity (Rv) of the thermoplastic resin is equal to or less than 0.36 dL/g.

6. The resin microparticle production method according to claim 2 ,
wherein the thermoplastic resin has an aromatic group in a main chain.

7. The resin microparticle production method according to claim 6 ,
wherein the thermoplastic resin has a sulfonyl group in the main chain.

8. The resin microparticle production method according to claim 2 ,
wherein a reduced viscosity (Rv) of the thermoplastic resin is equal to or less than 0.36 dL/g.

9. The resin microparticle production method according to claim 1 ,
wherein a reduced viscosity (Rv) of the thermoplastic resin is equal to or less than 0.36 dL/g.

10. The resin microparticle production method according to claim 3 ,
wherein a reduced viscosity (Rv) of the thermoplastic resin is equal to or less than 0.36 dL/g.

11. The resin microparticle production method according to claim 4 ,
wherein a reduced viscosity (Rv) of the thermoplastic resin is equal to or less than 0.36 dL/g.

12. The resin microparticle production method according to claim 1 ,
wherein the aromatic polyether sulfone has general formula (E) as a constituent unit,

wherein Y represents —SO 2 —, Z represents a single bond, an alkylidene group having 1 to 10 carbon atoms, —SO 2 —, or —CO—, R 1 , R 2 , R 3 and R 4 each independently represents an alkyl group having 1 to 4 carbon atoms or an alkoxy group having 1 to 4 carbon atoms, and n 1 , n 2 , n 3 , and n 4 each independently represents an integer of 0 to 4, and
when n 1 , n 2 , n 3 , or n 4 is an integer of 2 to 4, a plurality of R 1 , R 2 , R 3 or R 4 may be the same or different from one another.

Assignees

• Sumitomo Chemical Co

Inventors

• GOUDA Kenji
• Sugimura Toshiaki
• Ohtomo Shinji

Classifications

• C08J3/12 Primary

  Powdering or granulating · CPC title

• C08J2201/0544

  the non-solvent being aqueous · CPC title

• C08G75/23

  Polyethersulfones · CPC title

• C08G85/002

  Post-polymerisation treatment · CPC title

• B29B11/02

  by dividing preformed material, e.g. sheets, rods · CPC title