Method of producing polycarbonate-based polymer microparticles comprising contacting an emulsion with a poor solvent, and polycarbonate-based polymer microparticles

Patent metadata

Field	Value
Publication number	US-9567443-B2
Application number	US-201314375262-A
Country	US
Kind code	B2
Filing date	Jan 18, 2013
Priority date	Jan 30, 2012
Publication date	Feb 14, 2017
Grant date	Feb 14, 2017

Abstract

A method of producing polycarbonate-based polymer microparticles including forming an emulsion in a system in which a polycarbonate-based polymer (A), a polymer (B) different from the polycarbonate-based polymer (A) and an organic solvent (C) are dissolved and mixed together and which causes phase separation into two phases of a solution phase having the polycarbonate-based polymer (A) as its main component and a solution phase having the polymer (B) different from the polycarbonate-based polymer (a) as its main component, and contacting a poor solvent for the polycarbonate-based polymer (A) with the emulsion at a temperature of 80° C. or higher to thereby precipitate microparticles of the polycarbonate-based polymer (A).

First claim

The invention claimed is:

1. A method of producing polycarbonate-based polymer microparticles comprising:
forming an emulsion in a system in which a polycarbonate-based polymer (A), a polymer (B) different from said polycarbonate-based polymer (A) and an organic solvent (C) are dissolved and mixed together and which causes phase separation into two phases of a solution phase having said polycarbonate-based polymer (A) as its main component and a solution phase having said polymer (B) different from said polycarbonate-based polymer (A) as its main component, and
contacting a poor solvent for said polycarbonate-based polymer (A) with said emulsion at a temperature of 80° C. or higher to thereby precipitate microparticles of said polycarbonate-based polymer (A).

2. The method according to claim 1 , wherein a contact temperature of said poor solvent for said polycarbonate-based polymer (A) with said emulsion is 90° C. or higher.

3. The method according to claim 2 , wherein said poor solvent for said polycarbonate-based polymer (A) is contacted with said emulsion at a ratio of 1 to 10 parts by mass to a total amount of said emulsion of 1 part by mass.

4. The method according to claim 2 , wherein said poor solvent for said polycarbonate-based polymer (A) is any of water, methanol and ethanol.

5. The method according to claim 2 , wherein said polymer (B) is any of polyvinyl alcohol, hydroxypropyl cellulose, polyethylene oxide and polyethylene glycol.

6. The method according to claim 1 , wherein said poor solvent for said polycarbonate-based polymer (A) is contacted with said emulsion at a ratio of 1 to 10 parts by mass to a total amount of said emulsion of 1 part by mass.

7. The method according to claim 6 , wherein said poor solvent for said polycarbonate-based polymer (A) is any of water, methanol and ethanol.

8. The method according to claim 7 , wherein said polymer (B) is any of polyvinyl alcohol, hydroxypropyl cellulose, polyethylene oxide and polyethylene glycol.

9. The method according to claim 1 , wherein said poor solvent for said polycarbonate-based polymer (A) is any of water, methanol and ethanol.

10. The method according to claim 9 , wherein said polymer (B) is any of polyvinyl alcohol, hydroxypropyl cellulose, polyethylene oxide and polyethylene glycol.

11. The method according to claim 1 , wherein said polymer (B) is any of polyvinyl alcohol, hydroxypropyl cellulose, polyethylene oxide and polyethylene glycol.

12. The method according to claim 1 , wherein said organic solvent (C) is an aprotic polar solvent.

13. The method according to claim 12 , wherein said aprotic polar solvent is any of N-methyl-2-pyrrolidone, dimethyl sulfoxide, N,N-dimethyl formamide, N,N-dimethyl acetamide and propylene carbonate.

Assignees

• Toray Industries

Inventors

• Asano Itaru
• Takezaki Hiroshi

Classifications

• C08G64/403

  Recovery of the polymer · CPC title

• C08G64/04

  Aromatic polycarbonates · CPC title

• C08G64/00

  Macromolecular compounds obtained by reactions forming a carbonic ester link in the main chain of the macromolecule (polycarbonate-amides C08G69/44; polycarbonate-imides C08G73/16) · CPC title

• Y10T428/2982

  Particulate matter [e.g., sphere, flake, etc.] · CPC title

• C08G64/16

  Aliphatic-aromatic or araliphatic polycarbonates · CPC title