Method for the purification of poly(arylene ethers)

Patent metadata

Field	Value
Publication number	US-9598537-B2
Application number	US-201414786986-A
Country	US
Kind code	B2
Filing date	Apr 22, 2014
Priority date	Apr 29, 2013
Publication date	Mar 21, 2017
Grant date	Mar 21, 2017

Abstract

The invention relates to a method for the purification of poly(arylene ethers) of formula (I) in which m=0 to 1.0, n=1.0-m, and Ar 1 , Ar 2 , Ar 3 and Ar 4 independently represent divalent arylene groups. The compound of formula (I) is produced in a first step 1, with a raw product being obtained by bringing a metal or ammonium salt of divalent dihydroxy derivatives of Ar 1 or Ar 3 into contact with one or more dihalogenated derivatives of Ar 2 and/or Ar 4 , in the presence of a solvent LM1. A precipitate that is present, if appropriate, is separated (step B) so as to obtain a solution L which then undergoes a membrane filtration (step C).

First claim

The invention claimed is:

1. A method for the purification of poly(arylene ethers) of formula (I):

where m=0 to 1.0 and n=1.0-m
and Ar 1 , Ar 2 , Ar 3 and Ar 4 are mutually independently divalent arylene residues,
wherein said method comprises:
A) preparing a crude product of the compound of formula (I) in a first step by bringing a metal salt or ammonium salt of divalent dihydroxy derivatives of Ar 1 or Ar 3 into contact with one or more dihalogenated derivatives of Ar 2 and/or Ar 4 , in the presence of a solvent LM1 to form a solution L or a suspension comprising a precipitate;
B) if a suspension comprising precipitate is formed in step A, removing precipitate to obtain solution L; and
C) filtering solution L by membrane filtration.

2. The method of claim 1 , wherein said crude product is prepared in the presence of a catalyst other than said metal or ammonium salt.

3. The method of claim 2 , wherein said catalyst comprises a metal selected from the group consisting of: copper, palladium and iron.

4. The method of claim 1 , wherein an aprotic polar solvent LM2 is added to the solution or suspension formed in step A.

5. The method of claim 4 , wherein the solvent LM1 in step A is selected from an aliphatic or aromatic, cyclic or acyclic, ether, ketone, ester or a mixture thereof.

6. The method of claim 4 , wherein the solvent LM1 in step A is selected from cyclohexanone, tetrahydrofuran, gamma-butyrolactone or a mixture thereof.

7. The method of claim 6 , wherein said solvent is, or comprises, tetrahydrofuran.

8. The method of claim 4 , wherein an acid is added to the solution or suspension formed in step A.

9. The method of claim 1 , wherein, in step B, precipitate is removed by filtration or centrifugation.

10. The method of claim 1 , wherein said membrane filtration is a nanofiltration.

11. The method of claim 1 , wherein the membranes of said membrane filters have a separating layer selected from polymers, glass, metal, ceramic or mixtures thereof.

12. The method of claim 1 , further comprising:
D) obtaining a solid polymer from a filtered solution produced in step C.

13. The method of claim 1 , wherein, in formula (I), m=1 and Ar 1 is a compound of formula (V):

14. The method of claim 1 , wherein in formula (I), m=1 and Ar 2 is a compound of formula (VI):

15. The method of claim 1 , wherein in formula (I), m=1 and the poly(arylene ether) is a polymer of the formula (IV):

16. The method of claim 15 , wherein said crude product is prepared in the presence of a catalyst selected from the group consisting of: copper, palladium and iron.

17. The method of claim 16 , wherein an aprotic polar solvent LM2 is added to the solution or suspension formed in step A.

18. The method of claim 17 , wherein the solvent in step A is selected from an aliphatic or aromatic, cyclic or acyclic, ether, ketone, ester or a mixture thereof.

19. The method of claim 18 , wherein the solvent in step A is selected from cyclohexanone, tetrahydrofuran, gamma-butyrolactone or a mixture thereof.

20. The method of claim 19 , further comprising:
D) obtaining a solid polymer from a filtered solution produced in step C.

Assignees

• Roos Martin
• HERWIG JüRGEN
• Micoine Kévin
• Weinelt Frank
• Evonik Degussa Gmbh

Inventors

• Roos Martin
• HERWIG JüRGEN
• Micoine Kévin
• Weinelt Frank

Classifications

• C08G65/40

  from phenols (I) and other compounds (II), e.g. OH-Ar-OH + X-Ar-X, where X is halogen atom, i.e. leaving group · CPC title

• B01D2311/12

  Addition of chemical agents · CPC title

• C08G65/44

  by oxidation of phenols · CPC title

• B01D2311/04

  Specific process operations in the feed stream; Feed pretreatment · CPC title

• B01D61/027

  Nanofiltration · CPC title