Process for the continuous preparation of cross-linked gelatinous polymers with a small particle size

• Main Authors: FUNK, RUEDIGER, STUEVEN, UWE, VAN ESBROECK, DOMINICUS, WEISMANTEL, MATTHIAS, POSSEMIERS, KARL J, DE KAEY, RONNY, HILLEBRECHT, ANNEMARIE
• Format: Patent
• Language: English; French; German
• Published: 24.03.2010
• Subjects: 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; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; THEIR PREPARATION OR CHEMICAL WORKING-UP; THEIR RELEVANT APPARATUS; TRANSPORTING

In the continuous preparation of finely divided, gel-form, crosslinked polymers (I) by copolymerizing water-soluble mono-ethylenically unsaturated monomers (II) with 0.001-5 mol. % (based on (II)) of monomers (III) containing at least two polymerizable groups in a kneader through which materials are transported axially, (a) the degree of filling of the kneader is at least 71%, (b) (II) contains up to 150 ppm hydroquinone hemi-ether (IV), (c) the polymerization zone temperature is more than 65[deg]C and/or (d) the kneader has back mixing ratio less than 0.33. Verfahren zur kontinuierlichen Herstellung von vernetzten, feinteiligen, gelförmigen Polymerisaten durch Copolymerisieren von a) wasserlöslichen, monoethylenisch ungesättigten Monomeren, b) 0,001 bis 5 Mol-% bezogen auf die Monomere (a), mindestens zwei polymerisierbare Gruppen enthaltenden Monomeren in einem Kneter mit einer Förderung der am Anfang des Kneters zugegebenen Stoffe in axialer Richtung zum Ende des Mischers, dadurch gekennzeichnet, dass die wasserlöslichen, monoethylenisch ungesättigten Monomeren bis zu 150 ppm eines Halbethers eines Hydrochinons, enthalten.