Process for the production of cation exchange resins of the carboxylic type

Claim 1

THE PROCESS OF PREPARING A CARBOXYLIC-TYPE CATIONEXCHANGE RESIN WHICH COMPRISES PREPARING AN AQUEOUS DISPERSION OF 65 TO 85 PARTS OF MONOMERIC ACRYLONITRILE AND 5 TO 20 PARTS OF A MONOMERIC COMPOUND TAKEN FROM THE GROUP CONSISTING OF DIVINYLBENZENE, METHACRYLIC ANHYDRIDE, GLYCOL METHACRYLATE, GLYCOL ACRYLATE, ALLYL METHACRYLATE, ALLYL ACRYLATE AND MIXTURES OF DIVINYLBENZENE, ETHYLVINYL BENZENE AND HIGH BOILING SATURATED COMPOUNDS, IN THE PRESENCE OF 2 TO 10 MOLAR PERCENT, BASED ON SAID MONOMERS OF A COMPOUND TAKEN FROM THE GROUP CONSISTING OF ACRYLIC-, METHACRYLIC-, AND WATER-INSOLUBLE MALEIC ESTERS WITH LOWER ALCOHOLS AND ESTERS OF VINYL ALCOHOL WITH LOWER ALIPHATIC ACIDS, A SUSPENSION AID TAKEN FROM THE GROUP CONSISTING OF POLYVINYL ALCOHOL, SODIUM POLYMETHACRYLATE, ALKALI-EARTH METAL PHOSPHATES, SILICATES, CARBONATES, STARCH AND GELATINE, AND AN ORGANIC PEROXIDE CATALYST, ADJUSTING TO A PH OF 5, HEATING TO 50-80* C- WHILE STIRRING IN AN ATMOSPHERE OF NITROGEN, AND SEPARATING THE RESULTING COPOLYMER IN FORM OF PEARLS FROM THE LIQUID AND SAPONIFYING THE COPOLYMER.