Intrinsic viscosity control of polyphenylene ether reaction mixt

Details Intrinsic viscosity control of polyphenylene ether reaction mixt Intrinsic viscosity control of polyphenylene ether reaction mixt

1976-12-20

1978-09-26

Lee, Lester L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

260860, 260874, 528486, C08G 6544

Patent

active

041169395

ABSTRACT:
Polyphenylene ethers produced by an oxidative coupling of a phenol in the presence of an oxygen-containing gas and a metal-amine complex catalyst are freed of catalyst and stabilized against molecular weight loss. Removal of the metal component and molecular weight loss control are effected by contacting the reaction mixture with an aromatic amine plus a metal chelating agent, which stabilizes the intrinsic viscosity of the polyphenylene ether in the reaction mixture. This procedure results in lower catalyst usage and shorter reaction time.

REFERENCES:
patent: 3635890 (1972-01-01), Takemura et al.
patent: 3838102 (1974-09-01), Bennett et al.
patent: 3951917 (1976-04-01), Floryan et al.
patent: 3954904 (1976-05-01), Yonemitsu et al.

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