Process for the preparation of a calcium sulphate-based...

Details Process for the preparation of a calcium sulphate-based... Process for the preparation of a calcium sulphate-based...

C - Chemistry, Metallurgy

09

C

C09C 1/02 (2006.01) C01F 11/46 (2006.01) C09D 17/00 (2006.01) D21H 17/67 (2006.01) D21H 19/38 (2006.01) D21H 19/52 (2006.01) D21H 19/58 (2006.01)

Patent

CA 2114652

A method for preparing an aqueous calcium-sulphate based suspension, particularly for use as a filler or coating pigment in paper manufacturing, wherein a calcium sulphate slurry is formed by means of a first viscosity-regulating additive containing a copolymer which is obtained from at least two different kinds of ethylene monomers, a second viscosity-regulating additive including an alkali metal phosphate or polyphosphate, and optionally a third viscosity-regulating additive containing a cellulose ether, the amount of added viscosity-regulating additive being such that the viscosity is 250-2500 mPa.s, preferably 500-2000 mPa.s, and that the concentration of solid matter is 60-77 %, preferably 66-72 %.

Procédé de préparation d'une suspension aqueuse à base de sulfate de calcium notamment destiné à être utilisé en tant que charge de masse ou pigment de couchage dans la fabrication de papier, suivant lequel on forme une bouillie de sulfate de calcium en mettant en oeuvre un premier additif régulateur de viscosité contenant un copolymère obtenu à partir de monomères éthylèni- ques d'au mains deux types différents, un deuxième additif régulateur de viscosité comprenant un phosphate ou un polyphos- phate d'un métal alcalin, et éventuellement un troisième additif régulateur de viscosité contenant un éther cellulosique, la quantité ajoutée d'additif régulateur de viscosité étant telle que la viscosité soit comprise antre 250 et 2500 mPa.s, de préférence entre 500 et 2000 mPa.s et que la concentration soit comprise entre 60 et 77% de matières solides, de préférence entre 66 et 72%.

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