Process for the removal of alkali from condensation resins

Details Process for the removal of alkali from condensation resins Process for the removal of alkali from condensation resins

1997-02-10

1998-06-23

Cooney, Jr., John M.

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

Synthetic resins

From ketone or ketene reactant

204155, 204554, 528482, C08G 218

Patent

active

057706778

ABSTRACT:
A process for the preparation of a condensation resin of low catalyst content from a ketone and an aldehyde comprising reacting the ketone and aldehyde in a polycondensation reaction in an aqueous medium in the presence of a basic catalyst to form the resin, which is contaminated with alkali ions from the basic catalyst, and then exposing the resin to an electrical field in a cell demarcated by ion-selective membranes permeable to the alkali ions whereby alkali ions are caused to migrate out of the resin through the membranes. Also, a process for the removal of alkali from condensation resins as described above.

REFERENCES:
patent: 3520850 (1970-07-01), Kiss
patent: 4731434 (1988-03-01), Dorffel

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