Method for precipitation of polyphenylene ether

Details Method for precipitation of polyphenylene ether Method for precipitation of polyphenylene ether

2003-01-30

2008-03-11

Cain, Edward J. (Department: 1714)

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

Synthetic resins

Treating polymer containing material or treating a solid...

C528S495000, C528S496000, C528S497000, C528S499000

Reexamination Certificate

active

07342088

ABSTRACT:
Method for precipitating polyphenylene ether which decreases fine particles therein and reduces periodic fluctuations in particle size. Method provides homogeneous polyphenylene ether particles. Polyphenylene ether particles are precipitated using mixed solution comprising good solvent for polyphenylene ether and poor solvent for polyphenylene ether. Method employs precipitation tank equipped with draft tube, stirring blade, baffle(s), solution supply port, poor solvent supply port, and exhaust port. Polyphenylene ether particles and poor solvent are added to mixed solution comprising good solvent and circularly flowed by rotation of stirring blade, polyphenylene ether solution for solution supply port, and poor solvent for poor solvent supply port, thereby precipitating polyphenylene ether particles having desired properties.

REFERENCES:
patent: 6627727 (2003-09-01), Yoshida et al.
patent: 1209183 (2002-05-01), None
patent: 5-78471 (1993-03-01), None
patent: 7-97441 (1995-04-01), None
patent: 2000-281777 (2000-10-01), None
patent: 2000-281799 (2000-10-01), None
patent: 2001-122962 (2001-05-01), None
patent: 2001-310946 (2001-11-01), None
English language abstract of JP 05078472 (Mar. 30, 1993).

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