Method for isolating polyphenylene ether polymer resins from...

Concentrating evaporators – Processes – Film

Reexamination Certificate

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C159S006200, C159S009100, C203S089000, C202S236000, C202S238000, C528S217000

Reexamination Certificate

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06860966

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.in-line-formulae description="In-line Formulae" end="lead"?5.3*1024RLδ exp(−24123/T)/m<C  Iin-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?100−(4960AP/Tm)<C  II;in-line-formulae description="In-line Formulae" end="tail"?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.

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