Process for producing aqueous fluorinated polymer dispersion...

Details Process for producing aqueous fluorinated polymer dispersion... Process for producing aqueous fluorinated polymer dispersion...

2009-05-01

2010-11-16

Boykin, Terressa M (Department: 1796)

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

Synthetic resins

Treating polymer containing material or treating a solid...

C264S176100, C264S219000, C521S030000, C524S544000, C526S074000, C526S206000, C526S213000, C528S50200C

Reexamination Certificate

active

07834137

ABSTRACT:
Provided is a process for producing an aqueous fluorinated polymer dispersion having a reduced content of a fluorinated emulsifier by using a weakly basic anion-exchange resin to adsorb and remove a fluorinated emulsifier with excellent efficiency from an aqueous fluorinated polymer dispersion. Also provided is a process for producing an aqueous fluorinated polymer dispersion having a reduced content of a fluorinated emulsifier, wherein the process includes: adding an organic carboxylic acid represented by the following formula (1):in-line-formulae description="In-line Formulae" end="lead"?Q(CH2)m(CH(OH))nCOOH  (1)in-line-formulae description="In-line Formulae" end="tail"?wherein Q is H, CH3or COOH, m and n each independently represent 0 or an integer of from 1 to 4, and 4≧n+m≧1, to an aqueous fluorinated polymer dispersion containing a fluorinated emulsifier; and then contacting with a weakly basic anion-exchange resin to adsorb and remove the fluorinated emulsifier.

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