AQUEOUS DISPERSIONS OF PRECIPITATED CALCIUM CARBONATE

A stable aqueous dispersion of platy particles and precipitated calcium carbonate, a method of producing the same and uses of the dispersion. The aqueous dispersion comprises 50 to 95 parts by weight of platy particles; and 5 to 50 parts by weight of precipitated calcium carbonate particles having a...

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Bibliographische Detailangaben
Hauptverfasser:	MIETTINEN, PAIVI, HEINONEN, JAANA, HAAKANA, SAMI
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	ADHESIVES CHEMISTRY DYES IMPREGNATING OR COATING OF PAPER MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS PAINTS PAPER NOT OTHERWISE PROVIDED FOR PAPER-MAKING POLISHES PREPARATION OF CARBON BLACK PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D PRODUCTION OF CELLULOSE PULP COMPOSITIONS TEXTILES 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
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Beschreibung
Zusammenfassung:	A stable aqueous dispersion of platy particles and precipitated calcium carbonate, a method of producing the same and uses of the dispersion. The aqueous dispersion comprises 50 to 95 parts by weight of platy particles; and 5 to 50 parts by weight of precipitated calcium carbonate particles having an average diameter of 30 to 60 nm. The dispersion has a dry matter content of more than 30 % by weight of the dispersion, and a Brookfield viscosity (100 rpm) of 200 to 5000 cP. The dispersion is suitable for forming barrier coatings on a substrate, having properties of improved gas barrier and improved mineral oil barrier. La présente invention concerne une dispersion aqueuse stable de particules lamellaires et de carbonate de calcium précipité, un procédé pour la produire et l'utilisation de la dispersion. La dispersion aqueuse comprend de 50 à 95 parties en poids de particules lamellaires; et de 5 à 50 parties en poids de particules de carbonate de calcium précipité ayant un diamètre moyen de 30 à 60 nm. La dispersion présente une teneur en matières sèches non supérieure à 30 % en poids de la dispersion, et une viscosité de Brookfield (100 tr/min) de 200 à 5 000 cP. La dispersion convient à la formation de revêtements formant barrières sur un substrat, présentant les propriétés de barrières améliorées aux gaz et de barrières améliorées aux huiles minérales.