Clay compositions and their use in paper making

Details Clay compositions and their use in paper making Clay compositions and their use in paper making

C - Chemistry, Metallurgy

09

C

C09C 1/42 (2006.01) C04B 33/18 (2006.01) D21H 17/69 (2006.01) D21H 23/14 (2006.01) D21H 17/14 (2006.01) D21H 17/29 (2006.01) D21H 17/37 (2006.01) D21H 17/45 (2006.01) D21H 17/68 (2006.01) D21H 21/10 (2006.01)

Patent

CA 2247163

Paper making processes, including microparticulate processes, which utilise bentonite are provided with bentonite in the form of a concentrate, or a dilute dispersion made by diluting the concentrate, wherein the concentrate is a dispersion of 15 to 40 % by weight bentonite in water containing citrate and has a viscosity below 5000cps and is a stable fluid. The concentrates are novel. They are preferably made by mixing alkaline earth bentonite with water and sodium citrate.

Cette invention concerne des procédés de fabrication de papier, y compris des procédés microparticulaires, dans lesquels on utilise la bentonite sous forme d'un concentré, ou d'une dispersion diluée obtenue par dilution de ce concentré. Le concentré est une dispersion contenant de 15 à 40 % en poids de bentonite dans l'eau contenant du citrate; ce concentré a une viscosité inférieure à 5000cps et est un fluide stable. Ces concentrés sont nouveaux. Ils sont de préférence obtenus par le mélange de bentonite alcalino-terreuse avec de l'eau et du citrate de sodium.

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