Title:
METHOD FOR ISOLATING POLYPHENYLENE ETHER POLYMER RESINS FROM SOLUTION
Document Type and Number:
WIPO Patent Application WO2003041831
Kind Code:
A3
Abstract:
A method of removing substantially all solvent from a solution containing a polyphenylene ether polymer resin with little by-product formation (less than 250 ppm) is provided. The method employs a wiped thin film evaporator with a cylindrical heating chamber operating under conditions that satisfy the relationships defined by Equations I and II: 5.3*10<24>RL delta exp(<-24123/T>)/m < C (I), 100- (4960AP/Tm) < C (II); yields are maximized wherein values for feed rate (m) and percent solids (C) are selected to provide a maximum value for the output, Q, determined from the equation m * C = Q and the melt viscosity of the polyphenylene ether product is less than 50,000 centipoise at the operating temperature of the cylindrical heating chamber.
Inventors:
PARRILLO DAVID
SINGH PROBJOT
SINGH PROBJOT
Application Number:
PCT/US2002/033240
Publication Date:
May 21, 2004
Filing Date:
October 15, 2002
Export Citation:
Assignee:
GEN ELECTRIC (US)
International Classes:
B01D1/22; C08G65/48; (IPC1-7): B01D1/22
Foreign References:
| EP0328902A1 | 1989-08-23 | |||
| CA1063761A | 1979-10-09 | |||
| US5256250A | 1993-10-26 | |||
| US4935472A | 1990-06-19 |
Other References:
See also references of EP 1467808A2
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