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filingDate 1983-09-06-04:00^^<http://www.w3.org/2001/XMLSchema#date>
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publicationDate 1984-04-25-04:00^^<http://www.w3.org/2001/XMLSchema#date>
publicationNumber EP-0106111-A1
titleOfInvention Process for continuously preparing copolymers of monoethylenically unsaturated mono- and dicarboxylic acids
abstract a) 10 bis 60 Gew.-% einer monoethylenisch ungesättigten Dicarbonsäure mit 4 bis 6 C-Atomen, ihres Salzes und/oder gegebenenfalls ihres Anhydrids, b) 90 bis 40 Gew.-% einer monoethylenisch ungesättigten Monocarbonsäure mit 3 bis 10 C-Atomen und/oder ihres Salzes und c) 0 bis 20 Gew.-% eines sonstigen carboxylgruppenfreien monoethylenisch ungesättigten, mit a) und b) copolymerisierbaren Monomeren nin Gegenwart von 0,5 bis 5 Gew.-% eines wasserlöslichen radikalbildenden Initiators in wäßrigem Medium bei 60 bis 150°C polymerisiert und gegebenenfalls die Anhydridgruppen verseift, und wobei man die Monomeren a) und b) in einer Form einsetzt, daß sie während der Polymerisationsreaktion zu 20 bis 80 % neutralisiert sind und wobei man die Copolymerisation in einer aus mehreren Reaktoren bestehenden Reaktorkaskade kontinuierlich führt, wobei man in alle Reaktoren eine wäßrige Lösung einer bereits hergestellten Copolymerisats aus a), b) und gegebenenfalls c) vorlegt, auf die erforderliche Reaktionstemperatur erhitzt, in den ersten Reaktor die Gesamtmenge an gegebenenfalls teilneutralisiertem a) mindestens 40 Gew.% an gegebenenfalls teilneutralisiertem b), gegebenenfalls ganz oder teilweise c) und die zur Polymerisation ganz oder zum Teil notwendige Menge an Initiator sowie gegebenenfalls noch die zur definitionsgemäßen Neutralisation nötige Menge eines Neutralisierungsmittels eindosiert, die Restmenge an gegebenenfalls neutralisiertem b) und gegebenenfalls c), die gegebenenfalls notwendige Restmenge an Initiator und Neutralisationsmittel in den zweiten Reaktor oder verteilt in den zweiten und die folgenden Reaktoren zugibt, und bei einer Verweilzeit von 0,5 bis 8 Stunden die Reaktionsteilnehmer aufeinander einwirken läßt. Die genannten Copolymerisate können als Inkrustiergungsinhibitoren oder für die scaling inhibition verwendet werden.Process for the preparation of copolymers which contain copolymerized monoethylenically unsaturated mono- and dicarboxylic acids as monomer units, in which - based in each case on the sum of the monomers - a) 10 to 60% by weight of a monoethylenically unsaturated dicarboxylic acid having 4 to 6 carbon atoms, its salt and / or, if appropriate, its anhydride, b) 90 to 40 wt .-% of a monoethylenically unsaturated monocarboxylic acid with 3 to 10 carbon atoms and / or its salt and c) 0 to 20% by weight of another carboxyl group-free monoethylenically unsaturated monomer which can be copolymerized with a) and b) polymerized in the presence of 0.5 to 5 wt .-% of a water-soluble radical-forming initiator in an aqueous medium at 60 to 150 ° C and optionally saponified the anhydride groups, and wherein the monomers a) and b) are used in a form that they during the polymerization reaction is neutralized to 20 to 80% and the copolymerization is carried out continuously in a reactor cascade consisting of several reactors, an aqueous solution of an already prepared copolymer from a), b) and, if appropriate, c) being placed in all reactors, onto which required reaction temperature heated, in the first reactor the total amount of optionally partially neutralized a) at least 40% by weight of optionally partially neutralized b), optionally wholly or partially c) and the amount of initiator required wholly or partially for the polymerization and, if appropriate, also the amount required for the definition Neutralization doses the necessary amount of a neutralizing agent, the remaining amount of optionally neutralized b) and optionally c), the possibly necessary remaining amount of initiator and neutralizing agent are added to the second reactor or distributed in the second and subsequent reactors, and the reaction participants act on one another with a residence time of 0.5 to 8 hours leaves. The copolymers mentioned can be used as incrustation inhibitors or for scaling inhibition.
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