PROCESS FOR MANUFACTURING PARTICLES BASED ON NATURAL CALCIUM CARBONATE AND SALTS OF ACRYLIC ACID-ETHYLENE, SUSPENSIONS AND DRY PIGMENTS OBTAINED, AND USES THEREOF

• Main Authors: HUNZIKER, PHILIPP, BURKHALTER, RENE, BURI, MATTHIAS, KARTH, BEAT, GANE, PATRICK
• Format: Patent
• Language: English; French
• Published: 18.09.2008
• Subjects: ADHESIVES; CHEMISTRY; COMPOSITIONS BASED THEREON; DYES; IMPREGNATING OR COATING OF PAPER; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; MIXING, e.g. DISSOLVING, EMULSIFYING, DISPERSING; NATURAL RESINS; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; PAPER NOT OTHERWISE PROVIDED FOR; PAPER-MAKING; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; POLISHES; PREPARATION OF CARBON BLACK; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; PRODUCTION OF CELLULOSE; PULP COMPOSITIONS; TEXTILES; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS,TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS

The present invention consists in a process for preparing at least one mineral material and/or at least one pigment, comprising a calcium carbonate made both partially organophilic and partially hydrophilic, wherein the carbonate is mixed and/or ground and/or concentrated in aqueous medium in the presence of at least one salt of ethylene acrylic acid, a dispersant and/or grinding aid being introduced before and/or during this treatment step. Another subject of the invention lies in the resulting dispersions and aqueous suspensions of calcium carbonate. They may be dried, and the dry pigments obtained likewise constitute a subject of the invention. The use of these aqueous dispersions and of these dry pigments in the field of plastics, paints and paper constitutes another subject of the invention. La présente invention consiste en un procédé de préparation d'au moins une matière minérale et / ou d'au moins un pigment, comprenant un carbonate de calcium rendu à la fois partiellement organophile et partiellement hydrophile, dans lequel le carbonate est mélangé et / ou broyé et / ou concentré en milieu aqueux, en présence d'au moins un sel de l'acide éthylène acrylique, un agent dispersant et / ou d'aide au broyage étant introduit avant et / ou pendant cette étape de traitement. Un autre objet de l'invention réside dans les dispersions et les suspensions aqueuses de carbonate de calcium ainsi obtenues. Elles peuvent être séchées et les pigments secs obtenus constituent aussi un objet de l'invention. L'utilisation de ces dispersions aqueuses et de ces pigments secs dans le domaine du plastique, des peintures et du papier constitue un autre objet de l'invention.