PROCESS FOR PRODUCTION OF CARBOXYLIC ACID POLYMERS

A process for preparing a carboxylic acid-based polymer comprising the steps of (A) a first polymerization reaction step comprising introducing an aqueous solution of monomers containing an alpha -unsaturated carboxylic acid or a salt thereof, an aqueous solution containing a hydrogensulfite, and a...

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Bibliographische Detailangaben
Hauptverfasser:	TAMAKI, SEIJI, KANO, KENJI, HIRAMATSU, SHINOBU, KAMEI, KOUJI, OSAKI, KAZUTOMO, YOSHIMURA, TADANORI, NAITOU, KAZUKI, TANAKA, NOBUSHIGE
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY COMPOSITIONS BASED THEREON MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS METALLURGY MIXING, e.g. DISSOLVING, EMULSIFYING, DISPERSING ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL THEIR PREPARATION OR CHEMICAL WORKING-UP THEIR RELEVANT APPARATUS TRANSPORTING
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Beschreibung
Zusammenfassung:	A process for preparing a carboxylic acid-based polymer comprising the steps of (A) a first polymerization reaction step comprising introducing an aqueous solution of monomers containing an alpha -unsaturated carboxylic acid or a salt thereof, an aqueous solution containing a hydrogensulfite, and a gas containing oxygen into a flow mixer to polymerize the monomers; and (B) a second polymerization reaction step comprising further polymerizing a reaction product containing the unreacted monomer obtained in the first polymerization reaction step. There can be stably and productively prepared a carboxylic acid-based polymer having a high quality with suppressed coloration and containing a reduced amount of impurities even if the amount of gas containing oxygen used in the initiation of the polymerization reaction is remarkably reduced.