C - Chemistry – Metallurgy – 09 – C
Patent
C - Chemistry, Metallurgy
09
C
C09C 1/02 (2006.01) D21H 17/67 (2006.01)
Patent
CA 2708091
The present invention relates to a process for the preparation of a pigment comprising a surface-reacted precipitated calcium carbonate (PCC), the process comprising the steps of a) providing at least one precipitated calcium carbonate (PCC)-com-prising pigment; b) providing H30+ ions; c) providing at least one anion being capable of forming water-insoluble calcium salts, said anion being solubilised in an aqueous medium; d) contacting said PCC- comprising pigment, with said H30+ ions and with said solubilised anions in an aqueous medium to form a slurry of surface-reacted PCC-comprising pigment, wherein said surface-reacted PCC comprises an insoluble, at least partially crystalline calcium salt of said anion formed on the surface of the PCC; wherein excess solubilised calcium ions are provided during step d). The present invention further relates to a slurry of surface-reacted PCC comprising pigment obtained by this process, its use as well as the surface- reacted PCC contained in the slurry.
La présente invention concerne un procédé pour la préparation d'un pigment comprenant un carbonate de calcium précipité (PCC) ayant réagi en surface, le procédé comprenant les étapes consistant à a) se procurer au moins un pigment comprenant du carbonate de calcium précipité (PCC) ; b) se procurer des ions H3O+ ; c) se procurer au moins un anion qui est capable de former des sels de calcium insolubles dans l'eau, ledit anion étant solubilisé dans un milieu aqueux ; d) mettre en contact ledit pigment comprenant du PCC avec lesdits ions H3O+ et avec lesdits anions solubilisés dans un milieu aqueux pour former une suspension épaisse de pigment comprenant du PCC ayant réagi en surface, ledit PCC ayant réagi en surface comprenant un sel de calcium insoluble, au moins partiellement cristallin, dudit anion formé sur la surface du PCC. Les ions calcium solubilisés en excès sont introduits au cours de l'étape d). La présente invention concerne en outre une suspension épaisse de pigment comprenant du PCC ayant réagi en surface obtenue par ce procédé, ses utilisations ainsi que le PCC ayant réagi en surface contenu dans la suspension épaisse.
Gane Patrick A. C.
Gerard Daniel E.
Scholkopf Joachim
Weitzel Hans-Joachim
Benoit & Cote Associes Inc.
Omya Development Ag
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