The concentration of hydrogen chloride in an aqueous suspension of a macromolecular chlorinated hydrocarbon containing said hydrogen chloride is reduced by contacting liquid phase of the suspension with a strong basic ion exchange resin containing exchangeable hydroxy groups or with a weak basic ion...http://www.google.com/patents/US5137943?utm_source=gb-gplus-sharePatent US5137943 - Removal of residual acid from chlorinated polymers
