USE OF POLYACRYLIC ACIDS AS GRINDING AIDS FOR CALCIUM CARBONATE

• Main Authors: GOTSCHE, MICHAEL, MICHL, KATHRIN, RIEGER, JENS, SCHMIDT, KATI
• Format: Patent
• Language: English; French; German
• Published: 23.09.2004
• Edition: 7
• Subjects: CHEMISTRY; COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS; CRUSHING, PULVERISING, OR DISINTEGRATING; CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OFSOLID INORGANIC COMPOUNDS; INORGANIC CHEMISTRY; METALLURGY; MILLING GRAIN; PERFORMING OPERATIONS; PREPARATORY TREATMENT OF GRAIN FOR MILLING; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ARTCOLLECTIONS [XRACs] AND DIGESTS; TRANSPORTING

Verwendung von Polyacrylsäuren, die mindestens zwei Kohlenstoffatome aufweisende, schwefelhaltige organische Endgruppen enthalten, ein mittleres Molekulargewicht Mwvon 5 000 bis 30 000 g/mol haben und durch eine Base, ausgewählt aus der Gruppe der Alkalimetallhydroxide und Ammoniak, zumindest teilweise neutralisiert sind, als Hilfsmittel für die Naßmahlung von Calciumcarbonat, und feinteilige wäßrige Suspensionen von Calciumcarbonat, die durch Naßmahlung von Calciumcarbonat in Gegenwart dieser Polyacrylsäuren hergestellt worden sind. The invention relates to the use of polyacrylic acids which contain organic terminal groups containing sulphur, comprising at least two carbon atoms, having an average molecular weight Mw of 5 000 - 30 000 g/mol and which are at least partially neutralised by a base which is selected from the group of alkali hydroxides and ammonia as auxiliary agents for wet grinding of calcium carbonate. The invention also relates to fine particle aqueous suspensions of calcium carbonate which are produced by wet grinding of calcium carbonate in the presence of said polyacrylic acids. Utilisation d'acides polyacryliques qui contiennent au moins deux groupes terminaux organiques contenant du soufre et possédant au moins deux atomes de carbone, qui possèdent un poids moléculaire moyen Mw de 5 000 à 30.000 g/mol et qui sont neutralisés au moins partiellement par une base choisie dans le groupe des hydroxydes de métal alcalin et de l'ammoniac, en tant qu'adjuvants pour le broyage humide de carbonate de calcium, et suspensions aqueuses à fines particules de carbonate de calcium qui sont préparées par broyage humide de carbonate de calcium en présence desdits acides polyacryliques.